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/wp-admin/includes/update-core.php

https://bitbucket.org/devbctph/futura_wp
PHP | 1393 lines | 1041 code | 79 blank | 273 comment | 109 complexity | fa17febed59ff44a857ced97c021a243 MD5 | raw file

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   1<?php
   2/**
   3 * WordPress core upgrade functionality.
   4 *
   5 * @package WordPress
   6 * @subpackage Administration
   7 * @since 2.7.0
   8 */
   9
  10/**
  11 * Stores files to be deleted.
  12 *
  13 * @since 2.7.0
  14 * @global array $_old_files
  15 * @var array
  16 * @name $_old_files
  17 */
  18global $_old_files;
  19
  20$_old_files = array(
  21// 2.0
  22'wp-admin/import-b2.php',
  23'wp-admin/import-blogger.php',
  24'wp-admin/import-greymatter.php',
  25'wp-admin/import-livejournal.php',
  26'wp-admin/import-mt.php',
  27'wp-admin/import-rss.php',
  28'wp-admin/import-textpattern.php',
  29'wp-admin/quicktags.js',
  30'wp-images/fade-butt.png',
  31'wp-images/get-firefox.png',
  32'wp-images/header-shadow.png',
  33'wp-images/smilies',
  34'wp-images/wp-small.png',
  35'wp-images/wpminilogo.png',
  36'wp.php',
  37// 2.0.8
  38'wp-includes/js/tinymce/plugins/inlinepopups/readme.txt',
  39// 2.1
  40'wp-admin/edit-form-ajax-cat.php',
  41'wp-admin/execute-pings.php',
  42'wp-admin/inline-uploading.php',
  43'wp-admin/link-categories.php',
  44'wp-admin/list-manipulation.js',
  45'wp-admin/list-manipulation.php',
  46'wp-includes/comment-functions.php',
  47'wp-includes/feed-functions.php',
  48'wp-includes/functions-compat.php',
  49'wp-includes/functions-formatting.php',
  50'wp-includes/functions-post.php',
  51'wp-includes/js/dbx-key.js',
  52'wp-includes/js/tinymce/plugins/autosave/langs/cs.js',
  53'wp-includes/js/tinymce/plugins/autosave/langs/sv.js',
  54'wp-includes/links.php',
  55'wp-includes/pluggable-functions.php',
  56'wp-includes/template-functions-author.php',
  57'wp-includes/template-functions-category.php',
  58'wp-includes/template-functions-general.php',
  59'wp-includes/template-functions-links.php',
  60'wp-includes/template-functions-post.php',
  61'wp-includes/wp-l10n.php',
  62// 2.2
  63'wp-admin/cat-js.php',
  64'wp-admin/import/b2.php',
  65'wp-includes/js/autosave-js.php',
  66'wp-includes/js/list-manipulation-js.php',
  67'wp-includes/js/wp-ajax-js.php',
  68// 2.3
  69'wp-admin/admin-db.php',
  70'wp-admin/cat.js',
  71'wp-admin/categories.js',
  72'wp-admin/custom-fields.js',
  73'wp-admin/dbx-admin-key.js',
  74'wp-admin/edit-comments.js',
  75'wp-admin/install-rtl.css',
  76'wp-admin/install.css',
  77'wp-admin/upgrade-schema.php',
  78'wp-admin/upload-functions.php',
  79'wp-admin/upload-rtl.css',
  80'wp-admin/upload.css',
  81'wp-admin/upload.js',
  82'wp-admin/users.js',
  83'wp-admin/widgets-rtl.css',
  84'wp-admin/widgets.css',
  85'wp-admin/xfn.js',
  86'wp-includes/js/tinymce/license.html',
  87// 2.5
  88'wp-admin/css/upload.css',
  89'wp-admin/images/box-bg-left.gif',
  90'wp-admin/images/box-bg-right.gif',
  91'wp-admin/images/box-bg.gif',
  92'wp-admin/images/box-butt-left.gif',
  93'wp-admin/images/box-butt-right.gif',
  94'wp-admin/images/box-butt.gif',
  95'wp-admin/images/box-head-left.gif',
  96'wp-admin/images/box-head-right.gif',
  97'wp-admin/images/box-head.gif',
  98'wp-admin/images/heading-bg.gif',
  99'wp-admin/images/login-bkg-bottom.gif',
 100'wp-admin/images/login-bkg-tile.gif',
 101'wp-admin/images/notice.gif',
 102'wp-admin/images/toggle.gif',
 103'wp-admin/includes/upload.php',
 104'wp-admin/js/dbx-admin-key.js',
 105'wp-admin/js/link-cat.js',
 106'wp-admin/profile-update.php',
 107'wp-admin/templates.php',
 108'wp-includes/images/wlw/WpComments.png',
 109'wp-includes/images/wlw/WpIcon.png',
 110'wp-includes/images/wlw/WpWatermark.png',
 111'wp-includes/js/dbx.js',
 112'wp-includes/js/fat.js',
 113'wp-includes/js/list-manipulation.js',
 114'wp-includes/js/tinymce/langs/en.js',
 115'wp-includes/js/tinymce/plugins/autosave/editor_plugin_src.js',
 116'wp-includes/js/tinymce/plugins/autosave/langs',
 117'wp-includes/js/tinymce/plugins/directionality/images',
 118'wp-includes/js/tinymce/plugins/directionality/langs',
 119'wp-includes/js/tinymce/plugins/inlinepopups/css',
 120'wp-includes/js/tinymce/plugins/inlinepopups/images',
 121'wp-includes/js/tinymce/plugins/inlinepopups/jscripts',
 122'wp-includes/js/tinymce/plugins/paste/images',
 123'wp-includes/js/tinymce/plugins/paste/jscripts',
 124'wp-includes/js/tinymce/plugins/paste/langs',
 125'wp-includes/js/tinymce/plugins/spellchecker/classes/HttpClient.class.php',
 126'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyGoogleSpell.class.php',
 127'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspell.class.php',
 128'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspellShell.class.php',
 129'wp-includes/js/tinymce/plugins/spellchecker/css/spellchecker.css',
 130'wp-includes/js/tinymce/plugins/spellchecker/images',
 131'wp-includes/js/tinymce/plugins/spellchecker/langs',
 132'wp-includes/js/tinymce/plugins/spellchecker/tinyspell.php',
 133'wp-includes/js/tinymce/plugins/wordpress/images',
 134'wp-includes/js/tinymce/plugins/wordpress/langs',
 135'wp-includes/js/tinymce/plugins/wordpress/wordpress.css',
 136'wp-includes/js/tinymce/plugins/wphelp',
 137'wp-includes/js/tinymce/themes/advanced/css',
 138'wp-includes/js/tinymce/themes/advanced/images',
 139'wp-includes/js/tinymce/themes/advanced/jscripts',
 140'wp-includes/js/tinymce/themes/advanced/langs',
 141// 2.5.1
 142'wp-includes/js/tinymce/tiny_mce_gzip.php',
 143// 2.6
 144'wp-admin/bookmarklet.php',
 145'wp-includes/js/jquery/jquery.dimensions.min.js',
 146'wp-includes/js/tinymce/plugins/wordpress/popups.css',
 147'wp-includes/js/wp-ajax.js',
 148// 2.7
 149'wp-admin/css/press-this-ie-rtl.css',
 150'wp-admin/css/press-this-ie.css',
 151'wp-admin/css/upload-rtl.css',
 152'wp-admin/edit-form.php',
 153'wp-admin/images/comment-pill.gif',
 154'wp-admin/images/comment-stalk-classic.gif',
 155'wp-admin/images/comment-stalk-fresh.gif',
 156'wp-admin/images/comment-stalk-rtl.gif',
 157'wp-admin/images/del.png',
 158'wp-admin/images/gear.png',
 159'wp-admin/images/media-button-gallery.gif',
 160'wp-admin/images/media-buttons.gif',
 161'wp-admin/images/postbox-bg.gif',
 162'wp-admin/images/tab.png',
 163'wp-admin/images/tail.gif',
 164'wp-admin/js/forms.js',
 165'wp-admin/js/upload.js',
 166'wp-admin/link-import.php',
 167'wp-includes/images/audio.png',
 168'wp-includes/images/css.png',
 169'wp-includes/images/default.png',
 170'wp-includes/images/doc.png',
 171'wp-includes/images/exe.png',
 172'wp-includes/images/html.png',
 173'wp-includes/images/js.png',
 174'wp-includes/images/pdf.png',
 175'wp-includes/images/swf.png',
 176'wp-includes/images/tar.png',
 177'wp-includes/images/text.png',
 178'wp-includes/images/video.png',
 179'wp-includes/images/zip.png',
 180'wp-includes/js/tinymce/tiny_mce_config.php',
 181'wp-includes/js/tinymce/tiny_mce_ext.js',
 182// 2.8
 183'wp-admin/js/users.js',
 184'wp-includes/js/swfupload/plugins/swfupload.documentready.js',
 185'wp-includes/js/swfupload/plugins/swfupload.graceful_degradation.js',
 186'wp-includes/js/swfupload/swfupload_f9.swf',
 187'wp-includes/js/tinymce/plugins/autosave',
 188'wp-includes/js/tinymce/plugins/paste/css',
 189'wp-includes/js/tinymce/utils/mclayer.js',
 190'wp-includes/js/tinymce/wordpress.css',
 191// 2.8.5
 192'wp-admin/import/btt.php',
 193'wp-admin/import/jkw.php',
 194// 2.9
 195'wp-admin/js/page.dev.js',
 196'wp-admin/js/page.js',
 197'wp-admin/js/set-post-thumbnail-handler.dev.js',
 198'wp-admin/js/set-post-thumbnail-handler.js',
 199'wp-admin/js/slug.dev.js',
 200'wp-admin/js/slug.js',
 201'wp-includes/gettext.php',
 202'wp-includes/js/tinymce/plugins/wordpress/js',
 203'wp-includes/streams.php',
 204// MU
 205'README.txt',
 206'htaccess.dist',
 207'index-install.php',
 208'wp-admin/css/mu-rtl.css',
 209'wp-admin/css/mu.css',
 210'wp-admin/images/site-admin.png',
 211'wp-admin/includes/mu.php',
 212'wp-admin/wpmu-admin.php',
 213'wp-admin/wpmu-blogs.php',
 214'wp-admin/wpmu-edit.php',
 215'wp-admin/wpmu-options.php',
 216'wp-admin/wpmu-themes.php',
 217'wp-admin/wpmu-upgrade-site.php',
 218'wp-admin/wpmu-users.php',
 219'wp-includes/images/wordpress-mu.png',
 220'wp-includes/wpmu-default-filters.php',
 221'wp-includes/wpmu-functions.php',
 222'wpmu-settings.php',
 223// 3.0
 224'wp-admin/categories.php',
 225'wp-admin/edit-category-form.php',
 226'wp-admin/edit-page-form.php',
 227'wp-admin/edit-pages.php',
 228'wp-admin/images/admin-header-footer.png',
 229'wp-admin/images/browse-happy.gif',
 230'wp-admin/images/ico-add.png',
 231'wp-admin/images/ico-close.png',
 232'wp-admin/images/ico-edit.png',
 233'wp-admin/images/ico-viewpage.png',
 234'wp-admin/images/fav-top.png',
 235'wp-admin/images/screen-options-left.gif',
 236'wp-admin/images/wp-logo-vs.gif',
 237'wp-admin/images/wp-logo.gif',
 238'wp-admin/import',
 239'wp-admin/js/wp-gears.dev.js',
 240'wp-admin/js/wp-gears.js',
 241'wp-admin/options-misc.php',
 242'wp-admin/page-new.php',
 243'wp-admin/page.php',
 244'wp-admin/rtl.css',
 245'wp-admin/rtl.dev.css',
 246'wp-admin/update-links.php',
 247'wp-admin/wp-admin.css',
 248'wp-admin/wp-admin.dev.css',
 249'wp-includes/js/codepress',
 250'wp-includes/js/codepress/engines/khtml.js',
 251'wp-includes/js/codepress/engines/older.js',
 252'wp-includes/js/jquery/autocomplete.dev.js',
 253'wp-includes/js/jquery/autocomplete.js',
 254'wp-includes/js/jquery/interface.js',
 255'wp-includes/js/scriptaculous/prototype.js',
 256'wp-includes/js/tinymce/wp-tinymce.js',
 257// 3.1
 258'wp-admin/edit-attachment-rows.php',
 259'wp-admin/edit-link-categories.php',
 260'wp-admin/edit-link-category-form.php',
 261'wp-admin/edit-post-rows.php',
 262'wp-admin/images/button-grad-active-vs.png',
 263'wp-admin/images/button-grad-vs.png',
 264'wp-admin/images/fav-arrow-vs-rtl.gif',
 265'wp-admin/images/fav-arrow-vs.gif',
 266'wp-admin/images/fav-top-vs.gif',
 267'wp-admin/images/list-vs.png',
 268'wp-admin/images/screen-options-right-up.gif',
 269'wp-admin/images/screen-options-right.gif',
 270'wp-admin/images/visit-site-button-grad-vs.gif',
 271'wp-admin/images/visit-site-button-grad.gif',
 272'wp-admin/link-category.php',
 273'wp-admin/sidebar.php',
 274'wp-includes/classes.php',
 275'wp-includes/js/tinymce/blank.htm',
 276'wp-includes/js/tinymce/plugins/media/css/content.css',
 277'wp-includes/js/tinymce/plugins/media/img',
 278'wp-includes/js/tinymce/plugins/safari',
 279// 3.2
 280'wp-admin/images/logo-login.gif',
 281'wp-admin/images/star.gif',
 282'wp-admin/js/list-table.dev.js',
 283'wp-admin/js/list-table.js',
 284'wp-includes/default-embeds.php',
 285'wp-includes/js/tinymce/plugins/wordpress/img/help.gif',
 286'wp-includes/js/tinymce/plugins/wordpress/img/more.gif',
 287'wp-includes/js/tinymce/plugins/wordpress/img/toolbars.gif',
 288'wp-includes/js/tinymce/themes/advanced/img/fm.gif',
 289'wp-includes/js/tinymce/themes/advanced/img/sflogo.png',
 290// 3.3
 291'wp-admin/css/colors-classic-rtl.css',
 292'wp-admin/css/colors-classic-rtl.dev.css',
 293'wp-admin/css/colors-fresh-rtl.css',
 294'wp-admin/css/colors-fresh-rtl.dev.css',
 295'wp-admin/css/dashboard-rtl.dev.css',
 296'wp-admin/css/dashboard.dev.css',
 297'wp-admin/css/global-rtl.css',
 298'wp-admin/css/global-rtl.dev.css',
 299'wp-admin/css/global.css',
 300'wp-admin/css/global.dev.css',
 301'wp-admin/css/install-rtl.dev.css',
 302'wp-admin/css/login-rtl.dev.css',
 303'wp-admin/css/login.dev.css',
 304'wp-admin/css/ms.css',
 305'wp-admin/css/ms.dev.css',
 306'wp-admin/css/nav-menu-rtl.css',
 307'wp-admin/css/nav-menu-rtl.dev.css',
 308'wp-admin/css/nav-menu.css',
 309'wp-admin/css/nav-menu.dev.css',
 310'wp-admin/css/plugin-install-rtl.css',
 311'wp-admin/css/plugin-install-rtl.dev.css',
 312'wp-admin/css/plugin-install.css',
 313'wp-admin/css/plugin-install.dev.css',
 314'wp-admin/css/press-this-rtl.dev.css',
 315'wp-admin/css/press-this.dev.css',
 316'wp-admin/css/theme-editor-rtl.css',
 317'wp-admin/css/theme-editor-rtl.dev.css',
 318'wp-admin/css/theme-editor.css',
 319'wp-admin/css/theme-editor.dev.css',
 320'wp-admin/css/theme-install-rtl.css',
 321'wp-admin/css/theme-install-rtl.dev.css',
 322'wp-admin/css/theme-install.css',
 323'wp-admin/css/theme-install.dev.css',
 324'wp-admin/css/widgets-rtl.dev.css',
 325'wp-admin/css/widgets.dev.css',
 326'wp-admin/includes/internal-linking.php',
 327'wp-includes/images/admin-bar-sprite-rtl.png',
 328'wp-includes/js/jquery/ui.button.js',
 329'wp-includes/js/jquery/ui.core.js',
 330'wp-includes/js/jquery/ui.dialog.js',
 331'wp-includes/js/jquery/ui.draggable.js',
 332'wp-includes/js/jquery/ui.droppable.js',
 333'wp-includes/js/jquery/ui.mouse.js',
 334'wp-includes/js/jquery/ui.position.js',
 335'wp-includes/js/jquery/ui.resizable.js',
 336'wp-includes/js/jquery/ui.selectable.js',
 337'wp-includes/js/jquery/ui.sortable.js',
 338'wp-includes/js/jquery/ui.tabs.js',
 339'wp-includes/js/jquery/ui.widget.js',
 340'wp-includes/js/l10n.dev.js',
 341'wp-includes/js/l10n.js',
 342'wp-includes/js/tinymce/plugins/wplink/css',
 343'wp-includes/js/tinymce/plugins/wplink/img',
 344'wp-includes/js/tinymce/plugins/wplink/js',
 345'wp-includes/js/tinymce/themes/advanced/img/wpicons.png',
 346'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/butt2.png',
 347'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/button_bg.png',
 348'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/down_arrow.gif',
 349'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/fade-butt.png',
 350'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/separator.gif',
 351// Don't delete, yet: 'wp-rss.php',
 352// Don't delete, yet: 'wp-rdf.php',
 353// Don't delete, yet: 'wp-rss2.php',
 354// Don't delete, yet: 'wp-commentsrss2.php',
 355// Don't delete, yet: 'wp-atom.php',
 356// Don't delete, yet: 'wp-feed.php',
 357// 3.4
 358'wp-admin/images/gray-star.png',
 359'wp-admin/images/logo-login.png',
 360'wp-admin/images/star.png',
 361'wp-admin/index-extra.php',
 362'wp-admin/network/index-extra.php',
 363'wp-admin/user/index-extra.php',
 364'wp-admin/images/screenshots/admin-flyouts.png',
 365'wp-admin/images/screenshots/coediting.png',
 366'wp-admin/images/screenshots/drag-and-drop.png',
 367'wp-admin/images/screenshots/help-screen.png',
 368'wp-admin/images/screenshots/media-icon.png',
 369'wp-admin/images/screenshots/new-feature-pointer.png',
 370'wp-admin/images/screenshots/welcome-screen.png',
 371'wp-includes/css/editor-buttons.css',
 372'wp-includes/css/editor-buttons.dev.css',
 373'wp-includes/js/tinymce/plugins/paste/blank.htm',
 374'wp-includes/js/tinymce/plugins/wordpress/css',
 375'wp-includes/js/tinymce/plugins/wordpress/editor_plugin.dev.js',
 376'wp-includes/js/tinymce/plugins/wordpress/img/embedded.png',
 377'wp-includes/js/tinymce/plugins/wordpress/img/more_bug.gif',
 378'wp-includes/js/tinymce/plugins/wordpress/img/page_bug.gif',
 379'wp-includes/js/tinymce/plugins/wpdialogs/editor_plugin.dev.js',
 380'wp-includes/js/tinymce/plugins/wpeditimage/css/editimage-rtl.css',
 381'wp-includes/js/tinymce/plugins/wpeditimage/editor_plugin.dev.js',
 382'wp-includes/js/tinymce/plugins/wpfullscreen/editor_plugin.dev.js',
 383'wp-includes/js/tinymce/plugins/wpgallery/editor_plugin.dev.js',
 384'wp-includes/js/tinymce/plugins/wpgallery/img/gallery.png',
 385'wp-includes/js/tinymce/plugins/wplink/editor_plugin.dev.js',
 386// Don't delete, yet: 'wp-pass.php',
 387// Don't delete, yet: 'wp-register.php',
 388// 3.5
 389'wp-admin/gears-manifest.php',
 390'wp-admin/includes/manifest.php',
 391'wp-admin/images/archive-link.png',
 392'wp-admin/images/blue-grad.png',
 393'wp-admin/images/button-grad-active.png',
 394'wp-admin/images/button-grad.png',
 395'wp-admin/images/ed-bg-vs.gif',
 396'wp-admin/images/ed-bg.gif',
 397'wp-admin/images/fade-butt.png',
 398'wp-admin/images/fav-arrow-rtl.gif',
 399'wp-admin/images/fav-arrow.gif',
 400'wp-admin/images/fav-vs.png',
 401'wp-admin/images/fav.png',
 402'wp-admin/images/gray-grad.png',
 403'wp-admin/images/loading-publish.gif',
 404'wp-admin/images/logo-ghost.png',
 405'wp-admin/images/logo.gif',
 406'wp-admin/images/menu-arrow-frame-rtl.png',
 407'wp-admin/images/menu-arrow-frame.png',
 408'wp-admin/images/menu-arrows.gif',
 409'wp-admin/images/menu-bits-rtl-vs.gif',
 410'wp-admin/images/menu-bits-rtl.gif',
 411'wp-admin/images/menu-bits-vs.gif',
 412'wp-admin/images/menu-bits.gif',
 413'wp-admin/images/menu-dark-rtl-vs.gif',
 414'wp-admin/images/menu-dark-rtl.gif',
 415'wp-admin/images/menu-dark-vs.gif',
 416'wp-admin/images/menu-dark.gif',
 417'wp-admin/images/required.gif',
 418'wp-admin/images/screen-options-toggle-vs.gif',
 419'wp-admin/images/screen-options-toggle.gif',
 420'wp-admin/images/toggle-arrow-rtl.gif',
 421'wp-admin/images/toggle-arrow.gif',
 422'wp-admin/images/upload-classic.png',
 423'wp-admin/images/upload-fresh.png',
 424'wp-admin/images/white-grad-active.png',
 425'wp-admin/images/white-grad.png',
 426'wp-admin/images/widgets-arrow-vs.gif',
 427'wp-admin/images/widgets-arrow.gif',
 428'wp-admin/images/wpspin_dark.gif',
 429'wp-includes/images/upload.png',
 430'wp-includes/js/prototype.js',
 431'wp-includes/js/scriptaculous',
 432'wp-admin/css/wp-admin-rtl.dev.css',
 433'wp-admin/css/wp-admin.dev.css',
 434'wp-admin/css/media-rtl.dev.css',
 435'wp-admin/css/media.dev.css',
 436'wp-admin/css/colors-classic.dev.css',
 437'wp-admin/css/customize-controls-rtl.dev.css',
 438'wp-admin/css/customize-controls.dev.css',
 439'wp-admin/css/ie-rtl.dev.css',
 440'wp-admin/css/ie.dev.css',
 441'wp-admin/css/install.dev.css',
 442'wp-admin/css/colors-fresh.dev.css',
 443'wp-includes/js/customize-base.dev.js',
 444'wp-includes/js/json2.dev.js',
 445'wp-includes/js/comment-reply.dev.js',
 446'wp-includes/js/customize-preview.dev.js',
 447'wp-includes/js/wplink.dev.js',
 448'wp-includes/js/tw-sack.dev.js',
 449'wp-includes/js/wp-list-revisions.dev.js',
 450'wp-includes/js/autosave.dev.js',
 451'wp-includes/js/admin-bar.dev.js',
 452'wp-includes/js/quicktags.dev.js',
 453'wp-includes/js/wp-ajax-response.dev.js',
 454'wp-includes/js/wp-pointer.dev.js',
 455'wp-includes/js/hoverIntent.dev.js',
 456'wp-includes/js/colorpicker.dev.js',
 457'wp-includes/js/wp-lists.dev.js',
 458'wp-includes/js/customize-loader.dev.js',
 459'wp-includes/js/jquery/jquery.table-hotkeys.dev.js',
 460'wp-includes/js/jquery/jquery.color.dev.js',
 461'wp-includes/js/jquery/jquery.color.js',
 462'wp-includes/js/jquery/jquery.hotkeys.dev.js',
 463'wp-includes/js/jquery/jquery.form.dev.js',
 464'wp-includes/js/jquery/suggest.dev.js',
 465'wp-admin/js/xfn.dev.js',
 466'wp-admin/js/set-post-thumbnail.dev.js',
 467'wp-admin/js/comment.dev.js',
 468'wp-admin/js/theme.dev.js',
 469'wp-admin/js/cat.dev.js',
 470'wp-admin/js/password-strength-meter.dev.js',
 471'wp-admin/js/user-profile.dev.js',
 472'wp-admin/js/theme-preview.dev.js',
 473'wp-admin/js/post.dev.js',
 474'wp-admin/js/media-upload.dev.js',
 475'wp-admin/js/word-count.dev.js',
 476'wp-admin/js/plugin-install.dev.js',
 477'wp-admin/js/edit-comments.dev.js',
 478'wp-admin/js/media-gallery.dev.js',
 479'wp-admin/js/custom-fields.dev.js',
 480'wp-admin/js/custom-background.dev.js',
 481'wp-admin/js/common.dev.js',
 482'wp-admin/js/inline-edit-tax.dev.js',
 483'wp-admin/js/gallery.dev.js',
 484'wp-admin/js/utils.dev.js',
 485'wp-admin/js/widgets.dev.js',
 486'wp-admin/js/wp-fullscreen.dev.js',
 487'wp-admin/js/nav-menu.dev.js',
 488'wp-admin/js/dashboard.dev.js',
 489'wp-admin/js/link.dev.js',
 490'wp-admin/js/user-suggest.dev.js',
 491'wp-admin/js/postbox.dev.js',
 492'wp-admin/js/tags.dev.js',
 493'wp-admin/js/image-edit.dev.js',
 494'wp-admin/js/media.dev.js',
 495'wp-admin/js/customize-controls.dev.js',
 496'wp-admin/js/inline-edit-post.dev.js',
 497'wp-admin/js/categories.dev.js',
 498'wp-admin/js/editor.dev.js',
 499'wp-includes/js/tinymce/plugins/wpeditimage/js/editimage.dev.js',
 500'wp-includes/js/tinymce/plugins/wpdialogs/js/popup.dev.js',
 501'wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.dev.js',
 502'wp-includes/js/plupload/handlers.dev.js',
 503'wp-includes/js/plupload/wp-plupload.dev.js',
 504'wp-includes/js/swfupload/handlers.dev.js',
 505'wp-includes/js/jcrop/jquery.Jcrop.dev.js',
 506'wp-includes/js/jcrop/jquery.Jcrop.js',
 507'wp-includes/js/jcrop/jquery.Jcrop.css',
 508'wp-includes/js/imgareaselect/jquery.imgareaselect.dev.js',
 509'wp-includes/css/wp-pointer.dev.css',
 510'wp-includes/css/editor.dev.css',
 511'wp-includes/css/jquery-ui-dialog.dev.css',
 512'wp-includes/css/admin-bar-rtl.dev.css',
 513'wp-includes/css/admin-bar.dev.css',
 514'wp-includes/js/jquery/ui/jquery.effects.clip.min.js',
 515'wp-includes/js/jquery/ui/jquery.effects.scale.min.js',
 516'wp-includes/js/jquery/ui/jquery.effects.blind.min.js',
 517'wp-includes/js/jquery/ui/jquery.effects.core.min.js',
 518'wp-includes/js/jquery/ui/jquery.effects.shake.min.js',
 519'wp-includes/js/jquery/ui/jquery.effects.fade.min.js',
 520'wp-includes/js/jquery/ui/jquery.effects.explode.min.js',
 521'wp-includes/js/jquery/ui/jquery.effects.slide.min.js',
 522'wp-includes/js/jquery/ui/jquery.effects.drop.min.js',
 523'wp-includes/js/jquery/ui/jquery.effects.highlight.min.js',
 524'wp-includes/js/jquery/ui/jquery.effects.bounce.min.js',
 525'wp-includes/js/jquery/ui/jquery.effects.pulsate.min.js',
 526'wp-includes/js/jquery/ui/jquery.effects.transfer.min.js',
 527'wp-includes/js/jquery/ui/jquery.effects.fold.min.js',
 528'wp-admin/images/screenshots/captions-1.png',
 529'wp-admin/images/screenshots/captions-2.png',
 530'wp-admin/images/screenshots/flex-header-1.png',
 531'wp-admin/images/screenshots/flex-header-2.png',
 532'wp-admin/images/screenshots/flex-header-3.png',
 533'wp-admin/images/screenshots/flex-header-media-library.png',
 534'wp-admin/images/screenshots/theme-customizer.png',
 535'wp-admin/images/screenshots/twitter-embed-1.png',
 536'wp-admin/images/screenshots/twitter-embed-2.png',
 537'wp-admin/js/utils.js',
 538'wp-admin/options-privacy.php',
 539'wp-app.php',
 540'wp-includes/class-wp-atom-server.php',
 541'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/ui.css',
 542// 3.5.2
 543'wp-includes/js/swfupload/swfupload-all.js',
 544// 3.6
 545'wp-admin/js/revisions-js.php',
 546'wp-admin/images/screenshots',
 547'wp-admin/js/categories.js',
 548'wp-admin/js/categories.min.js',
 549'wp-admin/js/custom-fields.js',
 550'wp-admin/js/custom-fields.min.js',
 551// 3.7
 552'wp-admin/js/cat.js',
 553'wp-admin/js/cat.min.js',
 554'wp-includes/js/tinymce/plugins/wpeditimage/js/editimage.min.js',
 555// 3.8
 556'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/page_bug.gif',
 557'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/more_bug.gif',
 558'wp-includes/js/thickbox/tb-close-2x.png',
 559'wp-includes/js/thickbox/tb-close.png',
 560'wp-includes/images/wpmini-blue-2x.png',
 561'wp-includes/images/wpmini-blue.png',
 562'wp-admin/css/colors-fresh.css',
 563'wp-admin/css/colors-classic.css',
 564'wp-admin/css/colors-fresh.min.css',
 565'wp-admin/css/colors-classic.min.css',
 566'wp-admin/js/about.min.js',
 567'wp-admin/js/about.js',
 568'wp-admin/images/arrows-dark-vs-2x.png',
 569'wp-admin/images/wp-logo-vs.png',
 570'wp-admin/images/arrows-dark-vs.png',
 571'wp-admin/images/wp-logo.png',
 572'wp-admin/images/arrows-pr.png',
 573'wp-admin/images/arrows-dark.png',
 574'wp-admin/images/press-this.png',
 575'wp-admin/images/press-this-2x.png',
 576'wp-admin/images/arrows-vs-2x.png',
 577'wp-admin/images/welcome-icons.png',
 578'wp-admin/images/wp-logo-2x.png',
 579'wp-admin/images/stars-rtl-2x.png',
 580'wp-admin/images/arrows-dark-2x.png',
 581'wp-admin/images/arrows-pr-2x.png',
 582'wp-admin/images/menu-shadow-rtl.png',
 583'wp-admin/images/arrows-vs.png',
 584'wp-admin/images/about-search-2x.png',
 585'wp-admin/images/bubble_bg-rtl-2x.gif',
 586'wp-admin/images/wp-badge-2x.png',
 587'wp-admin/images/wordpress-logo-2x.png',
 588'wp-admin/images/bubble_bg-rtl.gif',
 589'wp-admin/images/wp-badge.png',
 590'wp-admin/images/menu-shadow.png',
 591'wp-admin/images/about-globe-2x.png',
 592'wp-admin/images/welcome-icons-2x.png',
 593'wp-admin/images/stars-rtl.png',
 594'wp-admin/images/wp-logo-vs-2x.png',
 595'wp-admin/images/about-updates-2x.png',
 596// 3.9
 597'wp-admin/css/colors.css',
 598'wp-admin/css/colors.min.css',
 599'wp-admin/css/colors-rtl.css',
 600'wp-admin/css/colors-rtl.min.css',
 601// Following files added back in 4.5 see #36083
 602// 'wp-admin/css/media-rtl.min.css',
 603// 'wp-admin/css/media.min.css',
 604// 'wp-admin/css/farbtastic-rtl.min.css',
 605'wp-admin/images/lock-2x.png',
 606'wp-admin/images/lock.png',
 607'wp-admin/js/theme-preview.js',
 608'wp-admin/js/theme-install.min.js',
 609'wp-admin/js/theme-install.js',
 610'wp-admin/js/theme-preview.min.js',
 611'wp-includes/js/plupload/plupload.html4.js',
 612'wp-includes/js/plupload/plupload.html5.js',
 613'wp-includes/js/plupload/changelog.txt',
 614'wp-includes/js/plupload/plupload.silverlight.js',
 615'wp-includes/js/plupload/plupload.flash.js',
 616// Added back in 4.9 [41328], see #41755
 617// 'wp-includes/js/plupload/plupload.js',
 618'wp-includes/js/tinymce/plugins/spellchecker',
 619'wp-includes/js/tinymce/plugins/inlinepopups',
 620'wp-includes/js/tinymce/plugins/media/js',
 621'wp-includes/js/tinymce/plugins/media/css',
 622'wp-includes/js/tinymce/plugins/wordpress/img',
 623'wp-includes/js/tinymce/plugins/wpdialogs/js',
 624'wp-includes/js/tinymce/plugins/wpeditimage/img',
 625'wp-includes/js/tinymce/plugins/wpeditimage/js',
 626'wp-includes/js/tinymce/plugins/wpeditimage/css',
 627'wp-includes/js/tinymce/plugins/wpgallery/img',
 628'wp-includes/js/tinymce/plugins/wpfullscreen/css',
 629'wp-includes/js/tinymce/plugins/paste/js',
 630'wp-includes/js/tinymce/themes/advanced',
 631'wp-includes/js/tinymce/tiny_mce.js',
 632'wp-includes/js/tinymce/mark_loaded_src.js',
 633'wp-includes/js/tinymce/wp-tinymce-schema.js',
 634'wp-includes/js/tinymce/plugins/media/editor_plugin.js',
 635'wp-includes/js/tinymce/plugins/media/editor_plugin_src.js',
 636'wp-includes/js/tinymce/plugins/media/media.htm',
 637'wp-includes/js/tinymce/plugins/wpview/editor_plugin_src.js',
 638'wp-includes/js/tinymce/plugins/wpview/editor_plugin.js',
 639'wp-includes/js/tinymce/plugins/directionality/editor_plugin.js',
 640'wp-includes/js/tinymce/plugins/directionality/editor_plugin_src.js',
 641'wp-includes/js/tinymce/plugins/wordpress/editor_plugin.js',
 642'wp-includes/js/tinymce/plugins/wordpress/editor_plugin_src.js',
 643'wp-includes/js/tinymce/plugins/wpdialogs/editor_plugin_src.js',
 644'wp-includes/js/tinymce/plugins/wpdialogs/editor_plugin.js',
 645'wp-includes/js/tinymce/plugins/wpeditimage/editimage.html',
 646'wp-includes/js/tinymce/plugins/wpeditimage/editor_plugin.js',
 647'wp-includes/js/tinymce/plugins/wpeditimage/editor_plugin_src.js',
 648'wp-includes/js/tinymce/plugins/fullscreen/editor_plugin_src.js',
 649'wp-includes/js/tinymce/plugins/fullscreen/fullscreen.htm',
 650'wp-includes/js/tinymce/plugins/fullscreen/editor_plugin.js',
 651'wp-includes/js/tinymce/plugins/wplink/editor_plugin_src.js',
 652'wp-includes/js/tinymce/plugins/wplink/editor_plugin.js',
 653'wp-includes/js/tinymce/plugins/wpgallery/editor_plugin_src.js',
 654'wp-includes/js/tinymce/plugins/wpgallery/editor_plugin.js',
 655'wp-includes/js/tinymce/plugins/tabfocus/editor_plugin.js',
 656'wp-includes/js/tinymce/plugins/tabfocus/editor_plugin_src.js',
 657'wp-includes/js/tinymce/plugins/wpfullscreen/editor_plugin.js',
 658'wp-includes/js/tinymce/plugins/wpfullscreen/editor_plugin_src.js',
 659'wp-includes/js/tinymce/plugins/paste/editor_plugin.js',
 660'wp-includes/js/tinymce/plugins/paste/pasteword.htm',
 661'wp-includes/js/tinymce/plugins/paste/editor_plugin_src.js',
 662'wp-includes/js/tinymce/plugins/paste/pastetext.htm',
 663'wp-includes/js/tinymce/langs/wp-langs.php',
 664// 4.1
 665'wp-includes/js/jquery/ui/jquery.ui.accordion.min.js',
 666'wp-includes/js/jquery/ui/jquery.ui.autocomplete.min.js',
 667'wp-includes/js/jquery/ui/jquery.ui.button.min.js',
 668'wp-includes/js/jquery/ui/jquery.ui.core.min.js',
 669'wp-includes/js/jquery/ui/jquery.ui.datepicker.min.js',
 670'wp-includes/js/jquery/ui/jquery.ui.dialog.min.js',
 671'wp-includes/js/jquery/ui/jquery.ui.draggable.min.js',
 672'wp-includes/js/jquery/ui/jquery.ui.droppable.min.js',
 673'wp-includes/js/jquery/ui/jquery.ui.effect-blind.min.js',
 674'wp-includes/js/jquery/ui/jquery.ui.effect-bounce.min.js',
 675'wp-includes/js/jquery/ui/jquery.ui.effect-clip.min.js',
 676'wp-includes/js/jquery/ui/jquery.ui.effect-drop.min.js',
 677'wp-includes/js/jquery/ui/jquery.ui.effect-explode.min.js',
 678'wp-includes/js/jquery/ui/jquery.ui.effect-fade.min.js',
 679'wp-includes/js/jquery/ui/jquery.ui.effect-fold.min.js',
 680'wp-includes/js/jquery/ui/jquery.ui.effect-highlight.min.js',
 681'wp-includes/js/jquery/ui/jquery.ui.effect-pulsate.min.js',
 682'wp-includes/js/jquery/ui/jquery.ui.effect-scale.min.js',
 683'wp-includes/js/jquery/ui/jquery.ui.effect-shake.min.js',
 684'wp-includes/js/jquery/ui/jquery.ui.effect-slide.min.js',
 685'wp-includes/js/jquery/ui/jquery.ui.effect-transfer.min.js',
 686'wp-includes/js/jquery/ui/jquery.ui.effect.min.js',
 687'wp-includes/js/jquery/ui/jquery.ui.menu.min.js',
 688'wp-includes/js/jquery/ui/jquery.ui.mouse.min.js',
 689'wp-includes/js/jquery/ui/jquery.ui.position.min.js',
 690'wp-includes/js/jquery/ui/jquery.ui.progressbar.min.js',
 691'wp-includes/js/jquery/ui/jquery.ui.resizable.min.js',
 692'wp-includes/js/jquery/ui/jquery.ui.selectable.min.js',
 693'wp-includes/js/jquery/ui/jquery.ui.slider.min.js',
 694'wp-includes/js/jquery/ui/jquery.ui.sortable.min.js',
 695'wp-includes/js/jquery/ui/jquery.ui.spinner.min.js',
 696'wp-includes/js/jquery/ui/jquery.ui.tabs.min.js',
 697'wp-includes/js/jquery/ui/jquery.ui.tooltip.min.js',
 698'wp-includes/js/jquery/ui/jquery.ui.widget.min.js',
 699'wp-includes/js/tinymce/skins/wordpress/images/dashicon-no-alt.png',
 700// 4.3
 701'wp-admin/js/wp-fullscreen.js',
 702'wp-admin/js/wp-fullscreen.min.js',
 703'wp-includes/js/tinymce/wp-mce-help.php',
 704'wp-includes/js/tinymce/plugins/wpfullscreen',
 705// 4.5
 706'wp-includes/theme-compat/comments-popup.php',
 707// 4.6
 708'wp-admin/includes/class-wp-automatic-upgrader.php', // Wrong file name, see #37628.
 709// 4.8
 710'wp-includes/js/tinymce/plugins/wpembed',
 711'wp-includes/js/tinymce/plugins/media/moxieplayer.swf',
 712'wp-includes/js/tinymce/skins/lightgray/fonts/readme.md',
 713'wp-includes/js/tinymce/skins/lightgray/fonts/tinymce-small.json',
 714'wp-includes/js/tinymce/skins/lightgray/fonts/tinymce.json',
 715'wp-includes/js/tinymce/skins/lightgray/skin.ie7.min.css',
 716// 4.9
 717'wp-admin/css/press-this-editor-rtl.css',
 718'wp-admin/css/press-this-editor-rtl.min.css',
 719'wp-admin/css/press-this-editor.css',
 720'wp-admin/css/press-this-editor.min.css',
 721'wp-admin/css/press-this-rtl.css',
 722'wp-admin/css/press-this-rtl.min.css',
 723'wp-admin/css/press-this.css',
 724'wp-admin/css/press-this.min.css',
 725'wp-admin/includes/class-wp-press-this.php',
 726'wp-admin/js/bookmarklet.js',
 727'wp-admin/js/bookmarklet.min.js',
 728'wp-admin/js/press-this.js',
 729'wp-admin/js/press-this.min.js',
 730'wp-includes/js/mediaelement/background.png',
 731'wp-includes/js/mediaelement/bigplay.png',
 732'wp-includes/js/mediaelement/bigplay.svg',
 733'wp-includes/js/mediaelement/controls.png',
 734'wp-includes/js/mediaelement/controls.svg',
 735'wp-includes/js/mediaelement/flashmediaelement.swf',
 736'wp-includes/js/mediaelement/froogaloop.min.js',
 737'wp-includes/js/mediaelement/jumpforward.png',
 738'wp-includes/js/mediaelement/loading.gif',
 739'wp-includes/js/mediaelement/silverlightmediaelement.xap',
 740'wp-includes/js/mediaelement/skipback.png',
 741'wp-includes/js/plupload/plupload.flash.swf',
 742'wp-includes/js/plupload/plupload.full.min.js',
 743'wp-includes/js/plupload/plupload.silverlight.xap',
 744'wp-includes/js/swfupload/plugins',
 745'wp-includes/js/swfupload/swfupload.swf',
 746	// 4.9.2
 747	'wp-includes/js/mediaelement/lang',
 748	'wp-includes/js/mediaelement/lang/ca.js',
 749	'wp-includes/js/mediaelement/lang/cs.js',
 750	'wp-includes/js/mediaelement/lang/de.js',
 751	'wp-includes/js/mediaelement/lang/es.js',
 752	'wp-includes/js/mediaelement/lang/fa.js',
 753	'wp-includes/js/mediaelement/lang/fr.js',
 754	'wp-includes/js/mediaelement/lang/hr.js',
 755	'wp-includes/js/mediaelement/lang/hu.js',
 756	'wp-includes/js/mediaelement/lang/it.js',
 757	'wp-includes/js/mediaelement/lang/ja.js',
 758	'wp-includes/js/mediaelement/lang/ko.js',
 759	'wp-includes/js/mediaelement/lang/nl.js',
 760	'wp-includes/js/mediaelement/lang/pl.js',
 761	'wp-includes/js/mediaelement/lang/pt.js',
 762	'wp-includes/js/mediaelement/lang/ro.js',
 763	'wp-includes/js/mediaelement/lang/ru.js',
 764	'wp-includes/js/mediaelement/lang/sk.js',
 765	'wp-includes/js/mediaelement/lang/sv.js',
 766	'wp-includes/js/mediaelement/lang/uk.js',
 767	'wp-includes/js/mediaelement/lang/zh-cn.js',
 768	'wp-includes/js/mediaelement/lang/zh.js',
 769	'wp-includes/js/mediaelement/mediaelement-flash-audio-ogg.swf',
 770	'wp-includes/js/mediaelement/mediaelement-flash-audio.swf',
 771	'wp-includes/js/mediaelement/mediaelement-flash-video-hls.swf',
 772	'wp-includes/js/mediaelement/mediaelement-flash-video-mdash.swf',
 773	'wp-includes/js/mediaelement/mediaelement-flash-video.swf',
 774	'wp-includes/js/mediaelement/renderers/dailymotion.js',
 775	'wp-includes/js/mediaelement/renderers/dailymotion.min.js',
 776	'wp-includes/js/mediaelement/renderers/facebook.js',
 777	'wp-includes/js/mediaelement/renderers/facebook.min.js',
 778	'wp-includes/js/mediaelement/renderers/soundcloud.js',
 779	'wp-includes/js/mediaelement/renderers/soundcloud.min.js',
 780	'wp-includes/js/mediaelement/renderers/twitch.js',
 781	'wp-includes/js/mediaelement/renderers/twitch.min.js',
 782);
 783
 784/**
 785 * Stores new files in wp-content to copy
 786 *
 787 * The contents of this array indicate any new bundled plugins/themes which
 788 * should be installed with the WordPress Upgrade. These items will not be
 789 * re-installed in future upgrades, this behaviour is controlled by the
 790 * introduced version present here being older than the current installed version.
 791 *
 792 * The content of this array should follow the following format:
 793 * Filename (relative to wp-content) => Introduced version
 794 * Directories should be noted by suffixing it with a trailing slash (/)
 795 *
 796 * @since 3.2.0
 797 * @since 4.7.0 New themes were not automatically installed for 4.4-4.6 on
 798 *              upgrade. New themes are now installed again. To disable new
 799 *              themes from being installed on upgrade, explicitly define
 800 *              CORE_UPGRADE_SKIP_NEW_BUNDLED as false.
 801 * @global array $_new_bundled_files
 802 * @var array
 803 * @name $_new_bundled_files
 804 */
 805global $_new_bundled_files;
 806
 807$_new_bundled_files = array(
 808	'plugins/akismet/'        => '2.0',
 809	'themes/twentyten/'       => '3.0',
 810	'themes/twentyeleven/'    => '3.2',
 811	'themes/twentytwelve/'    => '3.5',
 812	'themes/twentythirteen/'  => '3.6',
 813	'themes/twentyfourteen/'  => '3.8',
 814	'themes/twentyfifteen/'   => '4.1',
 815	'themes/twentysixteen/'   => '4.4',
 816	'themes/twentyseventeen/' => '4.7',
 817);
 818
 819/**
 820 * Upgrades the core of WordPress.
 821 *
 822 * This will create a .maintenance file at the base of the WordPress directory
 823 * to ensure that people can not access the web site, when the files are being
 824 * copied to their locations.
 825 *
 826 * The files in the `$_old_files` list will be removed and the new files
 827 * copied from the zip file after the database is upgraded.
 828 *
 829 * The files in the `$_new_bundled_files` list will be added to the installation
 830 * if the version is greater than or equal to the old version being upgraded.
 831 *
 832 * The steps for the upgrader for after the new release is downloaded and
 833 * unzipped is:
 834 *   1. Test unzipped location for select files to ensure that unzipped worked.
 835 *   2. Create the .maintenance file in current WordPress base.
 836 *   3. Copy new WordPress directory over old WordPress files.
 837 *   4. Upgrade WordPress to new version.
 838 *     4.1. Copy all files/folders other than wp-content
 839 *     4.2. Copy any language files to WP_LANG_DIR (which may differ from WP_CONTENT_DIR
 840 *     4.3. Copy any new bundled themes/plugins to their respective locations
 841 *   5. Delete new WordPress directory path.
 842 *   6. Delete .maintenance file.
 843 *   7. Remove old files.
 844 *   8. Delete 'update_core' option.
 845 *
 846 * There are several areas of failure. For instance if PHP times out before step
 847 * 6, then you will not be able to access any portion of your site. Also, since
 848 * the upgrade will not continue where it left off, you will not be able to
 849 * automatically remove old files and remove the 'update_core' option. This
 850 * isn't that bad.
 851 *
 852 * If the copy of the new WordPress over the old fails, then the worse is that
 853 * the new WordPress directory will remain.
 854 *
 855 * If it is assumed that every file will be copied over, including plugins and
 856 * themes, then if you edit the default theme, you should rename it, so that
 857 * your changes remain.
 858 *
 859 * @since 2.7.0
 860 *
 861 * @global WP_Filesystem_Base $wp_filesystem
 862 * @global array              $_old_files
 863 * @global array              $_new_bundled_files
 864 * @global wpdb               $wpdb
 865 * @global string             $wp_version
 866 * @global string             $required_php_version
 867 * @global string             $required_mysql_version
 868 *
 869 * @param string $from New release unzipped path.
 870 * @param string $to   Path to old WordPress installation.
 871 * @return WP_Error|null WP_Error on failure, null on success.
 872 */
 873function update_core($from, $to) {
 874	global $wp_filesystem, $_old_files, $_new_bundled_files, $wpdb;
 875
 876	@set_time_limit( 300 );
 877
 878	/**
 879	 * Filters feedback messages displayed during the core update process.
 880	 *
 881	 * The filter is first evaluated after the zip file for the latest version
 882	 * has been downloaded and unzipped. It is evaluated five more times during
 883	 * the process:
 884	 *
 885	 * 1. Before WordPress begins the core upgrade process.
 886	 * 2. Before Maintenance Mode is enabled.
 887	 * 3. Before WordPress begins copying over the necessary files.
 888	 * 4. Before Maintenance Mode is disabled.
 889	 * 5. Before the database is upgraded.
 890	 *
 891	 * @since 2.5.0
 892	 *
 893	 * @param string $feedback The core update feedback messages.
 894	 */
 895	apply_filters( 'update_feedback', __( 'Verifying the unpacked files&#8230;' ) );
 896
 897	// Sanity check the unzipped distribution.
 898	$distro = '';
 899	$roots = array( '/wordpress/', '/wordpress-mu/' );
 900	foreach ( $roots as $root ) {
 901		if ( $wp_filesystem->exists( $from . $root . 'readme.html' ) && $wp_filesystem->exists( $from . $root . 'wp-includes/version.php' ) ) {
 902			$distro = $root;
 903			break;
 904		}
 905	}
 906	if ( ! $distro ) {
 907		$wp_filesystem->delete( $from, true );
 908		return new WP_Error( 'insane_distro', __('The update could not be unpacked') );
 909	}
 910
 911
 912	/*
 913	 * Import $wp_version, $required_php_version, and $required_mysql_version from the new version.
 914	 * DO NOT globalise any variables imported from `version-current.php` in this function.
 915	 *
 916	 * BC Note: $wp_filesystem->wp_content_dir() returned unslashed pre-2.8
 917	 */
 918	$versions_file = trailingslashit( $wp_filesystem->wp_content_dir() ) . 'upgrade/version-current.php';
 919	if ( ! $wp_filesystem->copy( $from . $distro . 'wp-includes/version.php', $versions_file ) ) {
 920		$wp_filesystem->delete( $from, true );
 921		return new WP_Error( 'copy_failed_for_version_file', __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ), 'wp-includes/version.php' );
 922	}
 923
 924	$wp_filesystem->chmod( $versions_file, FS_CHMOD_FILE );
 925	require( WP_CONTENT_DIR . '/upgrade/version-current.php' );
 926	$wp_filesystem->delete( $versions_file );
 927
 928	$php_version    = phpversion();
 929	$mysql_version  = $wpdb->db_version();
 930	$old_wp_version = $GLOBALS['wp_version']; // The version of WordPress we're updating from
 931	$development_build = ( false !== strpos( $old_wp_version . $wp_version, '-' )  ); // a dash in the version indicates a Development release
 932	$php_compat     = version_compare( $php_version, $required_php_version, '>=' );
 933	if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) )
 934		$mysql_compat = true;
 935	else
 936		$mysql_compat = version_compare( $mysql_version, $required_mysql_version, '>=' );
 937
 938	if ( !$mysql_compat || !$php_compat )
 939		$wp_filesystem->delete($from, true);
 940
 941	if ( !$mysql_compat && !$php_compat )
 942		return new WP_Error( 'php_mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.'), $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version ) );
 943	elseif ( !$php_compat )
 944		return new WP_Error( 'php_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher. You are running version %3$s.'), $wp_version, $required_php_version, $php_version ) );
 945	elseif ( !$mysql_compat )
 946		return new WP_Error( 'mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires MySQL version %2$s or higher. You are running version %3$s.'), $wp_version, $required_mysql_version, $mysql_version ) );
 947
 948	/** This filter is documented in wp-admin/includes/update-core.php */
 949	apply_filters( 'update_feedback', __( 'Preparing to install the latest version&#8230;' ) );
 950
 951	// Don't copy wp-content, we'll deal with that below
 952	// We also copy version.php last so failed updates report their old version
 953	$skip = array( 'wp-content', 'wp-includes/version.php' );
 954	$check_is_writable = array();
 955
 956	// Check to see which files don't really need updating - only available for 3.7 and higher
 957	if ( function_exists( 'get_core_checksums' ) ) {
 958		// Find the local version of the working directory
 959		$working_dir_local = WP_CONTENT_DIR . '/upgrade/' . basename( $from ) . $distro;
 960
 961		$checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );
 962		if ( is_array( $checksums ) && isset( $checksums[ $wp_version ] ) )
 963			$checksums = $checksums[ $wp_version ]; // Compat code for 3.7-beta2
 964		if ( is_array( $checksums ) ) {
 965			foreach ( $checksums as $file => $checksum ) {
 966				if ( 'wp-content' == substr( $file, 0, 10 ) )
 967					continue;
 968				if ( ! file_exists( ABSPATH . $file ) )
 969					continue;
 970				if ( ! file_exists( $working_dir_local . $file ) )
 971					continue;
 972				if ( '.' === dirname( $file ) && in_array( pathinfo( $file, PATHINFO_EXTENSION ), array( 'html', 'txt' ) ) )
 973					continue;
 974				if ( md5_file( ABSPATH . $file ) === $checksum )
 975					$skip[] = $file;
 976				else
 977					$check_is_writable[ $file ] = ABSPATH . $file;
 978			}
 979		}
 980	}
 981
 982	// If we're using the direct method, we can predict write failures that are due to permissions.
 983	if ( $check_is_writable && 'direct' === $wp_filesystem->method ) {
 984		$files_writable = array_filter( $check_is_writable, array( $wp_filesystem, 'is_writable' ) );
 985		if ( $files_writable !== $check_is_writable ) {
 986			$files_not_writable = array_diff_key( $check_is_writable, $files_writable );
 987			foreach ( $files_not_writable as $relative_file_not_writable => $file_not_writable ) {
 988				// If the writable check failed, chmod file to 0644 and try again, same as copy_dir().
 989				$wp_filesystem->chmod( $file_not_writable, FS_CHMOD_FILE );
 990				if ( $wp_filesystem->is_writable( $file_not_writable ) )
 991					unset( $files_not_writable[ $relative_file_not_writable ] );
 992			}
 993
 994			// Store package-relative paths (the key) of non-writable files in the WP_Error object.
 995			$error_data = version_compare( $old_wp_version, '3.7-beta2', '>' ) ? array_keys( $files_not_writable ) : '';
 996
 997			if ( $files_not_writable )
 998				return new WP_Error( 'files_not_writable', __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ), implode( ', ', $error_data ) );
 999		}
1000	}
1001
1002	/** This filter is documented in wp-admin/includes/update-core.php */
1003	apply_filters( 'update_feedback', __( 'Enabling Maintenance mode&#8230;' ) );
1004	// Create maintenance file to signal that we are upgrading
1005	$maintenance_string = '<?php $upgrading = ' . time() . '; ?>';
1006	$maintenance_file = $to . '.maintenance';
1007	$wp_filesystem->delete($maintenance_file);
1008	$wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE);
1009
1010	/** This filter is documented in wp-admin/includes/update-core.php */
1011	apply_filters( 'update_feedback', __( 'Copying the required files&#8230;' ) );
1012	// Copy new versions of WP files into place.
1013	$result = _copy_dir( $from . $distro, $to, $skip );
1014	if ( is_wp_error( $result ) )
1015		$result = new WP_Error( $result->get_error_code(), $result->get_error_message(), substr( $result->get_error_data(), strlen( $to ) ) );
1016
1017	// Since we know the core files have copied over, we can now copy the version file
1018	if ( ! is_wp_error( $result ) ) {
1019		if ( ! $wp_filesystem->copy( $from . $distro . 'wp-includes/version.php', $to . 'wp-includes/version.php', true /* overwrite */ ) ) {
1020			$wp_filesystem->delete( $from, true );
1021			$result = new WP_Error( 'copy_failed_for_version_file', __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ), 'wp-includes/version.php' );
1022		}
1023		$wp_filesystem->chmod( $to . 'wp-includes/version.php', FS_CHMOD_FILE );
1024	}
1025
1026	// Check to make sure everything copied correctly, ignoring the contents of wp-content
1027	$skip = array( 'wp-content' );
1028	$failed = array();
1029	if ( isset( $checksums ) && is_array( $checksums ) ) {
1030		foreach ( $checksums as $file => $checksum ) {
1031			if ( 'wp-content' == substr( $file, 0, 10 ) )
1032				continue;
1033			if ( ! file_exists( $working_dir_local . $file ) )
1034				continue;
1035			if ( '.' === dirname( $file ) && in_array( pathinfo( $file, PATHINFO_EXTENSION ), array( 'html', 'txt' ) ) ) {
1036				$skip[] = $file;
1037				continue;
1038			}
1039			if ( file_exists( ABSPATH . $file ) && md5_file( ABSPATH . $file ) == $checksum )
1040				$skip[] = $file;
1041			else
1042				$failed[] = $file;
1043		}
1044	}
1045
1046	// Some files didn't copy properly
1047	if ( ! empty( $failed ) ) {
1048		$total_size = 0;
1049		foreach ( $failed as $file ) {
1050			if ( file_exists( $working_dir_local . $file ) )
1051				$total_size += filesize( $working_dir_local . $file );
1052		}
1053
1054		// If we don't have enough free space, it isn't worth trying again.
1055		// Unlikely to be hit due to the check in unzip_file().
1056		$available_space = @disk_free_space( ABSPATH );
1057		if ( $available_space && $total_size >= $available_space ) {
1058			$result = new WP_Error( 'disk_full', __( 'There is not enough free disk space to complete the update.' ) );
1059		} else {
1060			$result = _copy_dir( $from . $distro, $to, $skip );
1061			if ( is_wp_error( $result ) )
1062				$result = new WP_Error( $result->get_error_code() . '_retry', $result->get_error_message(), substr( $result->get_error_data(), strlen( $to ) ) );
1063		}
1064	}
1065
1066	// Custom Content Directory needs updating now.
1067	// Copy Languages
1068	if ( !is_wp_error($result) && $wp_filesystem->is_dir($from . $distro . 'wp-content/languages') ) {
1069		if ( WP_LANG_DIR != ABSPATH . WPINC . '/languages' || @is_dir(WP_LANG_DIR) )
1070			$lang_dir = WP_LANG_DIR;
1071		else
1072			$lang_dir = WP_CONTENT_DIR . '/languages';
1073
1074		if ( !@is_dir($lang_dir) && 0 === strpos($lang_dir, ABSPATH) ) { // Check the language directory exists first
1075			$wp_filesystem->mkdir($to . str_replace(ABSPATH, '', $lang_dir), FS_CHMOD_DIR); // If it's within the ABSPATH we can handle it here, otherwise they're out of luck.
1076			clearstatcache(); // for FTP, Need to clear the stat cache
1077		}
1078
1079		if ( @is_dir($lang_dir) ) {
1080			$wp_lang_dir = $wp_filesystem->find_folder($lang_dir);
1081			if ( $wp_lang_dir ) {
1082				$result = copy_dir($from . $distro . 'wp-content/languages/', $wp_lang_dir);
1083				if ( is_wp_error( $result ) )
1084					$result = new WP_Error( $result->get_error_code() . '_languages', $result->get_error_message(), substr( $result->get_error_data(), strlen( $wp_lang_dir ) ) );
1085			}
1086		}
1087	}
1088
1089	/** This filter is documented in wp-admin/includes/update-core.php */
1090	apply_filters( 'update_feedback', __( 'Disabling Maintenance mode&#8230;' ) );
1091	// Remove maintenance file, we're done with potential site-breaking changes
1092	$wp_filesystem->delete( $maintenance_file );
1093
1094	// 3.5 -> 3.5+ - an empty twentytwelve directory was created upon upgrade to 3.5 for some users, preventing installation of Twenty Twelve.
1095	if ( '3.5' == $old_wp_version ) {
1096		if ( is_dir( WP_CONTENT_DIR . '/themes/twentytwelve' ) && ! file_exists( WP_CONTENT_DIR . '/themes/twentytwelve/style.css' )  ) {
1097			$wp_filesystem->delete( $wp_filesystem->wp_themes_dir() . 'twentytwelve/' );
1098		}
1099	}
1100
1101	// Copy New bundled plugins & themes
1102	// This gives us the ability to install new plugins & themes bundled with future versions of WordPress whilst avoiding the re-install upon upgrade issue.
1103	// $development_build controls us overwriting bundled themes and plugins when a non-stable release is being updated
1104	if ( !is_wp_error($result) && ( ! defined('CORE_UPGRADE_SKIP_NEW_BUNDLED') || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
1105		foreach ( (array) $_new_bundled_files as $file => $introduced_version ) {
1106			// If a $development_build or if $introduced version is greater than what the site was previously running
1107			if ( $development_build || version_compare( $introduced_version, $old_wp_version, '>' ) ) {
1108				$directory = ('/' == $file[ strlen($file)-1 ]);
1109				list($type, $filename) = explode('/', $file, 2);
1110
1111				// Check to see if the bundled items exist before attempting to copy them
1112				if ( ! $wp_filesystem->exists( $from . $distro . 'wp-content/' . $file ) )
1113					continue;
1114
1115				if ( 'plugins' == $type )
1116					$dest = $wp_filesystem->wp_plugins_dir();
1117				elseif ( 'themes' == $type )
1118					$dest = trailingslashit($wp_filesystem->wp_themes_dir()); // Back-compat, ::wp_themes_dir() did not return trailingslash'd pre-3.2
1119				else
1120					continue;
1121
1122				if ( ! $directory ) {
1123					if ( ! $development_build && $wp_filesystem->exists( $dest . $filename ) )
1124						continue;
1125
1126					if ( ! $wp_filesystem->copy($from . $distro . 'wp-content/' . $file, $dest . $filename, FS_CHMOD_FILE) )
1127						$result = new WP_Error( "copy_failed_for_new_bundled_$type", __( 'Could not copy file.' ), $dest . $filename );
1128				} else {
1129					if ( ! $development_build && $wp_filesystem->is_dir( $dest . $filename ) )
1130						continue;
1131
1132					$wp_filesystem->mkdir($dest . $filename, FS_CHMOD_DIR);
1133					$_result = copy_dir( $from . $distro . 'wp-content/' . $file, $dest . $filename);
1134
1135					// If a error occurs partway through this final step, keep the error flowing through, but keep process going.
1136					if ( is_wp_error( $_result ) ) {
1137						if ( ! is_wp_error( $result ) )
1138							$result = new WP_Error;
1139						$result->add( $_result->get_error_code() . "_$type", $_result->get_error_message(), substr( $_result->get_error_data(), strlen( $dest ) ) );
1140					}
1141				}
1142			}
1143		} //end foreach
1144	}
1145
1146	// Handle $result error from the above blocks
1147	if ( is_wp_error($result) ) {
1148		$wp_filesystem->delete($from, true);
1149		return $result;
1150	}
1151
1152	// Remove old files
1153	foreach ( $_old_files as $old_file ) {
1154		$old_file = $to . $old_file;
1155		if ( !$wp_filesystem->exists($old_file) )
1156			continue;
1157
1158		// If the file isn't deleted, try writing an empty string to the file instead.
1159		if ( ! $wp_filesystem->delete( $old_file, true ) && $wp_filesystem->is_file( $old_file ) ) {
1160			$wp_filesystem->put_contents( $old_file, '' );
1161		}
1162	}
1163
1164	// Remove any Genericons example.html's from the filesystem
1165	_upgrade_422_remove_genericons();
1166
1167	// Remove the REST API plugin if its version is Beta 4 or lower
1168	_upgrade_440_force_deactivate_incompatible_plugins();
1169
1170	// Upgrade DB with separate request
1171	/** This filter is documented in wp-admin/includes/update-core.php */
1172	apply_filters( 'update_feedback', __( 'Upgrading database&#8230;' ) );
1173	$db_upgrade_url = admin_url('upgrade.php?step=upgrade_db');
1174	wp_remote_post($db_upgrade_url, array('timeout' => 60));
1175
1176	// Clear the cache to prevent an update_option() from saving a stale db_version to the cache
1177	wp_cache_flush();
1178	// (Not all cache back ends listen to 'flush')
1179	wp_cache_delete( 'alloptions', 'options' );
1180
1181	// Remove working directory
1182	$wp_filesystem->delete($from, true);
1183
1184	// Force refresh of update information
1185	if ( function_exists('delete_site_transient') )
1186		delete_site_transient('update_core');
1187	else
1188		delete_option('update_core');
1189
1190	/**
1191	 * Fires after WordPress core has been successfully updated.
1192	 *
1193	 * @since 3.3.0
1194	 *
1195	 * @param string $wp_version The current WordPress version.
1196	 */
1197	do_action( '_core_updated_successfully', $wp_version );
1198
1199	// Clear the option that blocks auto updates after failures, now that we've been successful.
1200	if ( function_exists( 'delete_site_option' ) )
1201		delete_site_option( 'auto_core_update_failed' );
1202
1203	return $wp_version;
1204}
1205
1206/**
1207 * Copies a directory from one location to another via the WordPress Filesystem Abstraction.
1208 * Assumes that WP_Filesystem() has already been called and setup.
1209 *
1210 * This is a temporary function for the 3.1 -> 3.2 upgrade, as well as for those upgrading to
1211 * 3.7+
1212 *
1213 * @ignore
1214 * @

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