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

https://bitbucket.org/cubeee/wp-fin
PHP | 1053 lines | 818 code | 60 blank | 175 comment | 93 complexity | ba4b520a3a840f3303e3c32a17b4c941 MD5 | raw file
   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.css',
 296'wp-admin/css/dashboard-rtl.dev.css',
 297'wp-admin/css/dashboard.css',
 298'wp-admin/css/dashboard.dev.css',
 299'wp-admin/css/farbtastic-rtl.css',
 300'wp-admin/css/global-rtl.css',
 301'wp-admin/css/global-rtl.dev.css',
 302'wp-admin/css/global.css',
 303'wp-admin/css/global.dev.css',
 304'wp-admin/css/install-rtl.css',
 305'wp-admin/css/install-rtl.dev.css',
 306'wp-admin/css/login-rtl.css',
 307'wp-admin/css/login-rtl.dev.css',
 308'wp-admin/css/login.css',
 309'wp-admin/css/login.dev.css',
 310'wp-admin/css/ms.css',
 311'wp-admin/css/ms.dev.css',
 312'wp-admin/css/nav-menu-rtl.css',
 313'wp-admin/css/nav-menu-rtl.dev.css',
 314'wp-admin/css/nav-menu.css',
 315'wp-admin/css/nav-menu.dev.css',
 316'wp-admin/css/plugin-install-rtl.css',
 317'wp-admin/css/plugin-install-rtl.dev.css',
 318'wp-admin/css/plugin-install.css',
 319'wp-admin/css/plugin-install.dev.css',
 320'wp-admin/css/press-this-rtl.css',
 321'wp-admin/css/press-this-rtl.dev.css',
 322'wp-admin/css/press-this.css',
 323'wp-admin/css/press-this.dev.css',
 324'wp-admin/css/theme-editor-rtl.css',
 325'wp-admin/css/theme-editor-rtl.dev.css',
 326'wp-admin/css/theme-editor.css',
 327'wp-admin/css/theme-editor.dev.css',
 328'wp-admin/css/theme-install-rtl.css',
 329'wp-admin/css/theme-install-rtl.dev.css',
 330'wp-admin/css/theme-install.css',
 331'wp-admin/css/theme-install.dev.css',
 332'wp-admin/css/widgets-rtl.css',
 333'wp-admin/css/widgets-rtl.dev.css',
 334'wp-admin/css/widgets.css',
 335'wp-admin/css/widgets.dev.css',
 336'wp-admin/includes/internal-linking.php',
 337'wp-includes/images/admin-bar-sprite-rtl.png',
 338'wp-includes/js/jquery/ui.button.js',
 339'wp-includes/js/jquery/ui.core.js',
 340'wp-includes/js/jquery/ui.dialog.js',
 341'wp-includes/js/jquery/ui.draggable.js',
 342'wp-includes/js/jquery/ui.droppable.js',
 343'wp-includes/js/jquery/ui.mouse.js',
 344'wp-includes/js/jquery/ui.position.js',
 345'wp-includes/js/jquery/ui.resizable.js',
 346'wp-includes/js/jquery/ui.selectable.js',
 347'wp-includes/js/jquery/ui.sortable.js',
 348'wp-includes/js/jquery/ui.tabs.js',
 349'wp-includes/js/jquery/ui.widget.js',
 350'wp-includes/js/l10n.dev.js',
 351'wp-includes/js/l10n.js',
 352'wp-includes/js/tinymce/plugins/wplink/css',
 353'wp-includes/js/tinymce/plugins/wplink/img',
 354'wp-includes/js/tinymce/plugins/wplink/js',
 355'wp-includes/js/tinymce/themes/advanced/img/wpicons.png',
 356'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/butt2.png',
 357'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/button_bg.png',
 358'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/down_arrow.gif',
 359'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/fade-butt.png',
 360'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/separator.gif',
 361// Don't delete, yet: 'wp-rss.php',
 362// Don't delete, yet: 'wp-rdf.php',
 363// Don't delete, yet: 'wp-rss2.php',
 364// Don't delete, yet: 'wp-commentsrss2.php',
 365// Don't delete, yet: 'wp-atom.php',
 366// Don't delete, yet: 'wp-feed.php',
 367// 3.4
 368'wp-admin/images/gray-star.png',
 369'wp-admin/images/logo-login.png',
 370'wp-admin/images/star.png',
 371'wp-admin/index-extra.php',
 372'wp-admin/network/index-extra.php',
 373'wp-admin/user/index-extra.php',
 374'wp-admin/images/screenshots/admin-flyouts.png',
 375'wp-admin/images/screenshots/coediting.png',
 376'wp-admin/images/screenshots/drag-and-drop.png',
 377'wp-admin/images/screenshots/help-screen.png',
 378'wp-admin/images/screenshots/media-icon.png',
 379'wp-admin/images/screenshots/new-feature-pointer.png',
 380'wp-admin/images/screenshots/welcome-screen.png',
 381'wp-includes/css/editor-buttons.css',
 382'wp-includes/css/editor-buttons.dev.css',
 383'wp-includes/js/tinymce/plugins/paste/blank.htm',
 384'wp-includes/js/tinymce/plugins/wordpress/css',
 385'wp-includes/js/tinymce/plugins/wordpress/editor_plugin.dev.js',
 386'wp-includes/js/tinymce/plugins/wordpress/img/embedded.png',
 387'wp-includes/js/tinymce/plugins/wordpress/img/more_bug.gif',
 388'wp-includes/js/tinymce/plugins/wordpress/img/page_bug.gif',
 389'wp-includes/js/tinymce/plugins/wpdialogs/editor_plugin.dev.js',
 390'wp-includes/js/tinymce/plugins/wpeditimage/css/editimage-rtl.css',
 391'wp-includes/js/tinymce/plugins/wpeditimage/editor_plugin.dev.js',
 392'wp-includes/js/tinymce/plugins/wpfullscreen/editor_plugin.dev.js',
 393'wp-includes/js/tinymce/plugins/wpgallery/editor_plugin.dev.js',
 394'wp-includes/js/tinymce/plugins/wpgallery/img/gallery.png',
 395'wp-includes/js/tinymce/plugins/wplink/editor_plugin.dev.js',
 396// Don't delete, yet: 'wp-pass.php',
 397// Don't delete, yet: 'wp-register.php',
 398// 3.5
 399'wp-admin/gears-manifest.php',
 400'wp-admin/includes/manifest.php',
 401'wp-admin/images/archive-link.png',
 402'wp-admin/images/blue-grad.png',
 403'wp-admin/images/button-grad-active.png',
 404'wp-admin/images/button-grad.png',
 405'wp-admin/images/ed-bg-vs.gif',
 406'wp-admin/images/ed-bg.gif',
 407'wp-admin/images/fade-butt.png',
 408'wp-admin/images/fav-arrow-rtl.gif',
 409'wp-admin/images/fav-arrow.gif',
 410'wp-admin/images/fav-vs.png',
 411'wp-admin/images/fav.png',
 412'wp-admin/images/gray-grad.png',
 413'wp-admin/images/loading-publish.gif',
 414'wp-admin/images/logo-ghost.png',
 415'wp-admin/images/logo.gif',
 416'wp-admin/images/menu-arrow-frame-rtl.png',
 417'wp-admin/images/menu-arrow-frame.png',
 418'wp-admin/images/menu-arrows.gif',
 419'wp-admin/images/menu-bits-rtl-vs.gif',
 420'wp-admin/images/menu-bits-rtl.gif',
 421'wp-admin/images/menu-bits-vs.gif',
 422'wp-admin/images/menu-bits.gif',
 423'wp-admin/images/menu-dark-rtl-vs.gif',
 424'wp-admin/images/menu-dark-rtl.gif',
 425'wp-admin/images/menu-dark-vs.gif',
 426'wp-admin/images/menu-dark.gif',
 427'wp-admin/images/required.gif',
 428'wp-admin/images/screen-options-toggle-vs.gif',
 429'wp-admin/images/screen-options-toggle.gif',
 430'wp-admin/images/toggle-arrow-rtl.gif',
 431'wp-admin/images/toggle-arrow.gif',
 432'wp-admin/images/upload-classic.png',
 433'wp-admin/images/upload-fresh.png',
 434'wp-admin/images/white-grad-active.png',
 435'wp-admin/images/white-grad.png',
 436'wp-admin/images/widgets-arrow-vs.gif',
 437'wp-admin/images/widgets-arrow.gif',
 438'wp-admin/images/wpspin_dark.gif',
 439'wp-includes/images/upload.png',
 440'wp-includes/js/prototype.js',
 441'wp-includes/js/scriptaculous',
 442'wp-admin/css/wp-admin-rtl.dev.css',
 443'wp-admin/css/wp-admin.dev.css',
 444'wp-admin/css/media-rtl.dev.css',
 445'wp-admin/css/media.dev.css',
 446'wp-admin/css/colors-classic.dev.css',
 447'wp-admin/css/customize-controls-rtl.dev.css',
 448'wp-admin/css/customize-controls.dev.css',
 449'wp-admin/css/ie-rtl.dev.css',
 450'wp-admin/css/ie.dev.css',
 451'wp-admin/css/install.dev.css',
 452'wp-admin/css/colors-fresh.dev.css',
 453'wp-includes/js/customize-base.dev.js',
 454'wp-includes/js/json2.dev.js',
 455'wp-includes/js/comment-reply.dev.js',
 456'wp-includes/js/customize-preview.dev.js',
 457'wp-includes/js/wplink.dev.js',
 458'wp-includes/js/tw-sack.dev.js',
 459'wp-includes/js/wp-list-revisions.dev.js',
 460'wp-includes/js/autosave.dev.js',
 461'wp-includes/js/admin-bar.dev.js',
 462'wp-includes/js/quicktags.dev.js',
 463'wp-includes/js/wp-ajax-response.dev.js',
 464'wp-includes/js/wp-pointer.dev.js',
 465'wp-includes/js/hoverIntent.dev.js',
 466'wp-includes/js/colorpicker.dev.js',
 467'wp-includes/js/wp-lists.dev.js',
 468'wp-includes/js/customize-loader.dev.js',
 469'wp-includes/js/jquery/jquery.table-hotkeys.dev.js',
 470'wp-includes/js/jquery/jquery.color.dev.js',
 471'wp-includes/js/jquery/jquery.color.js',
 472'wp-includes/js/jquery/jquery.hotkeys.dev.js',
 473'wp-includes/js/jquery/jquery.form.dev.js',
 474'wp-includes/js/jquery/suggest.dev.js',
 475'wp-admin/js/xfn.dev.js',
 476'wp-admin/js/set-post-thumbnail.dev.js',
 477'wp-admin/js/comment.dev.js',
 478'wp-admin/js/theme.dev.js',
 479'wp-admin/js/cat.dev.js',
 480'wp-admin/js/password-strength-meter.dev.js',
 481'wp-admin/js/user-profile.dev.js',
 482'wp-admin/js/theme-preview.dev.js',
 483'wp-admin/js/post.dev.js',
 484'wp-admin/js/media-upload.dev.js',
 485'wp-admin/js/word-count.dev.js',
 486'wp-admin/js/plugin-install.dev.js',
 487'wp-admin/js/edit-comments.dev.js',
 488'wp-admin/js/media-gallery.dev.js',
 489'wp-admin/js/custom-fields.dev.js',
 490'wp-admin/js/custom-background.dev.js',
 491'wp-admin/js/common.dev.js',
 492'wp-admin/js/inline-edit-tax.dev.js',
 493'wp-admin/js/gallery.dev.js',
 494'wp-admin/js/utils.dev.js',
 495'wp-admin/js/widgets.dev.js',
 496'wp-admin/js/wp-fullscreen.dev.js',
 497'wp-admin/js/nav-menu.dev.js',
 498'wp-admin/js/dashboard.dev.js',
 499'wp-admin/js/link.dev.js',
 500'wp-admin/js/user-suggest.dev.js',
 501'wp-admin/js/postbox.dev.js',
 502'wp-admin/js/tags.dev.js',
 503'wp-admin/js/image-edit.dev.js',
 504'wp-admin/js/media.dev.js',
 505'wp-admin/js/customize-controls.dev.js',
 506'wp-admin/js/inline-edit-post.dev.js',
 507'wp-admin/js/categories.dev.js',
 508'wp-admin/js/editor.dev.js',
 509'wp-includes/js/tinymce/plugins/wpeditimage/js/editimage.dev.js',
 510'wp-includes/js/tinymce/plugins/wpdialogs/js/popup.dev.js',
 511'wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.dev.js',
 512'wp-includes/js/plupload/handlers.dev.js',
 513'wp-includes/js/plupload/wp-plupload.dev.js',
 514'wp-includes/js/swfupload/handlers.dev.js',
 515'wp-includes/js/jcrop/jquery.Jcrop.dev.js',
 516'wp-includes/js/jcrop/jquery.Jcrop.js',
 517'wp-includes/js/jcrop/jquery.Jcrop.css',
 518'wp-includes/js/imgareaselect/jquery.imgareaselect.dev.js',
 519'wp-includes/css/wp-pointer.dev.css',
 520'wp-includes/css/editor.dev.css',
 521'wp-includes/css/jquery-ui-dialog.dev.css',
 522'wp-includes/css/admin-bar-rtl.dev.css',
 523'wp-includes/css/admin-bar.dev.css',
 524'wp-includes/js/jquery/ui/jquery.effects.clip.min.js',
 525'wp-includes/js/jquery/ui/jquery.effects.scale.min.js',
 526'wp-includes/js/jquery/ui/jquery.effects.blind.min.js',
 527'wp-includes/js/jquery/ui/jquery.effects.core.min.js',
 528'wp-includes/js/jquery/ui/jquery.effects.shake.min.js',
 529'wp-includes/js/jquery/ui/jquery.effects.fade.min.js',
 530'wp-includes/js/jquery/ui/jquery.effects.explode.min.js',
 531'wp-includes/js/jquery/ui/jquery.effects.slide.min.js',
 532'wp-includes/js/jquery/ui/jquery.effects.drop.min.js',
 533'wp-includes/js/jquery/ui/jquery.effects.highlight.min.js',
 534'wp-includes/js/jquery/ui/jquery.effects.bounce.min.js',
 535'wp-includes/js/jquery/ui/jquery.effects.pulsate.min.js',
 536'wp-includes/js/jquery/ui/jquery.effects.transfer.min.js',
 537'wp-includes/js/jquery/ui/jquery.effects.fold.min.js',
 538'wp-admin/images/screenshots/captions-1.png',
 539'wp-admin/images/screenshots/captions-2.png',
 540'wp-admin/images/screenshots/flex-header-1.png',
 541'wp-admin/images/screenshots/flex-header-2.png',
 542'wp-admin/images/screenshots/flex-header-3.png',
 543'wp-admin/images/screenshots/flex-header-media-library.png',
 544'wp-admin/images/screenshots/theme-customizer.png',
 545'wp-admin/images/screenshots/twitter-embed-1.png',
 546'wp-admin/images/screenshots/twitter-embed-2.png',
 547'wp-admin/js/utils.js',
 548'wp-admin/options-privacy.php',
 549'wp-app.php',
 550'wp-includes/class-wp-atom-server.php',
 551'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/ui.css',
 552// 3.5.2
 553'wp-includes/js/swfupload/swfupload-all.js',
 554// 3.6
 555'wp-admin/js/revisions-js.php',
 556'wp-admin/images/screenshots',
 557'wp-admin/js/categories.js',
 558'wp-admin/js/categories.min.js',
 559'wp-admin/js/custom-fields.js',
 560'wp-admin/js/custom-fields.min.js',
 561// 3.7
 562'wp-admin/js/cat.js',
 563'wp-admin/js/cat.min.js',
 564'wp-includes/js/tinymce/plugins/wpeditimage/js/editimage.min.js',
 565// 3.8
 566'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/page_bug.gif',
 567'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/more_bug.gif',
 568'wp-includes/js/thickbox/tb-close-2x.png',
 569'wp-includes/js/thickbox/tb-close.png',
 570'wp-includes/images/wpmini-blue-2x.png',
 571'wp-includes/images/wpmini-blue.png',
 572'wp-admin/css/colors-fresh.css',
 573'wp-admin/css/colors-classic.css',
 574'wp-admin/css/colors-fresh.min.css',
 575'wp-admin/css/colors-classic.min.css',
 576'wp-admin/js/about.min.js',
 577'wp-admin/js/about.js',
 578'wp-admin/images/arrows-dark-vs-2x.png',
 579'wp-admin/images/wp-logo-vs.png',
 580'wp-admin/images/arrows-dark-vs.png',
 581'wp-admin/images/wp-logo.png',
 582'wp-admin/images/arrows-pr.png',
 583'wp-admin/images/arrows-dark.png',
 584'wp-admin/images/press-this.png',
 585'wp-admin/images/press-this-2x.png',
 586'wp-admin/images/arrows-vs-2x.png',
 587'wp-admin/images/welcome-icons.png',
 588'wp-admin/images/wp-logo-2x.png',
 589'wp-admin/images/stars-rtl-2x.png',
 590'wp-admin/images/arrows-dark-2x.png',
 591'wp-admin/images/arrows-pr-2x.png',
 592'wp-admin/images/menu-shadow-rtl.png',
 593'wp-admin/images/arrows-vs.png',
 594'wp-admin/images/about-search-2x.png',
 595'wp-admin/images/bubble_bg-rtl-2x.gif',
 596'wp-admin/images/wp-badge-2x.png',
 597'wp-admin/images/wordpress-logo-2x.png',
 598'wp-admin/images/bubble_bg-rtl.gif',
 599'wp-admin/images/wp-badge.png',
 600'wp-admin/images/menu-shadow.png',
 601'wp-admin/images/about-globe-2x.png',
 602'wp-admin/images/welcome-icons-2x.png',
 603'wp-admin/images/stars-rtl.png',
 604'wp-admin/images/wp-logo-vs-2x.png',
 605'wp-admin/images/about-updates-2x.png',
 606);
 607
 608/**
 609 * Stores new files in wp-content to copy
 610 *
 611 * The contents of this array indicate any new bundled plugins/themes which
 612 * should be installed with the WordPress Upgrade. These items will not be
 613 * re-installed in future upgrades, this behaviour is controlled by the
 614 * introduced version present here being older than the current installed version.
 615 *
 616 * The content of this array should follow the following format:
 617 * Filename (relative to wp-content) => Introduced version
 618 * Directories should be noted by suffixing it with a trailing slash (/)
 619 *
 620 * @since 3.2.0
 621 * @global array $_new_bundled_files
 622 * @var array
 623 * @name $_new_bundled_files
 624 */
 625global $_new_bundled_files;
 626
 627$_new_bundled_files = array(
 628	'plugins/akismet/'       => '2.0',
 629	'themes/twentyten/'      => '3.0',
 630	'themes/twentyeleven/'   => '3.2',
 631	'themes/twentytwelve/'   => '3.5',
 632	'themes/twentythirteen/' => '3.6',
 633	'themes/twentyfourteen/' => '3.8',
 634);
 635
 636/**
 637 * Upgrade the core of WordPress.
 638 *
 639 * This will create a .maintenance file at the base of the WordPress directory
 640 * to ensure that people can not access the web site, when the files are being
 641 * copied to their locations.
 642 *
 643 * The files in the {@link $_old_files} list will be removed and the new files
 644 * copied from the zip file after the database is upgraded.
 645 *
 646 * The files in the {@link $_new_bundled_files} list will be added to the installation
 647 * if the version is greater than or equal to the old version being upgraded.
 648 *
 649 * The steps for the upgrader for after the new release is downloaded and
 650 * unzipped is:
 651 *   1. Test unzipped location for select files to ensure that unzipped worked.
 652 *   2. Create the .maintenance file in current WordPress base.
 653 *   3. Copy new WordPress directory over old WordPress files.
 654 *   4. Upgrade WordPress to new version.
 655 *     4.1. Copy all files/folders other than wp-content
 656 *     4.2. Copy any language files to WP_LANG_DIR (which may differ from WP_CONTENT_DIR
 657 *     4.3. Copy any new bundled themes/plugins to their respective locations
 658 *   5. Delete new WordPress directory path.
 659 *   6. Delete .maintenance file.
 660 *   7. Remove old files.
 661 *   8. Delete 'update_core' option.
 662 *
 663 * There are several areas of failure. For instance if PHP times out before step
 664 * 6, then you will not be able to access any portion of your site. Also, since
 665 * the upgrade will not continue where it left off, you will not be able to
 666 * automatically remove old files and remove the 'update_core' option. This
 667 * isn't that bad.
 668 *
 669 * If the copy of the new WordPress over the old fails, then the worse is that
 670 * the new WordPress directory will remain.
 671 *
 672 * If it is assumed that every file will be copied over, including plugins and
 673 * themes, then if you edit the default theme, you should rename it, so that
 674 * your changes remain.
 675 *
 676 * @since 2.7.0
 677 *
 678 * @param string $from New release unzipped path.
 679 * @param string $to Path to old WordPress installation.
 680 * @return WP_Error|null WP_Error on failure, null on success.
 681 */
 682function update_core($from, $to) {
 683	global $wp_filesystem, $_old_files, $_new_bundled_files, $wpdb;
 684
 685	@set_time_limit( 300 );
 686
 687	// Sanity check the unzipped distribution
 688	apply_filters( 'update_feedback', __('Verifying the unpacked files&#8230;') );
 689	$distro = '';
 690	$roots = array( '/wordpress/', '/wordpress-mu/' );
 691	foreach ( $roots as $root ) {
 692		if ( $wp_filesystem->exists( $from . $root . 'readme.html' ) && $wp_filesystem->exists( $from . $root . 'wp-includes/version.php' ) ) {
 693			$distro = $root;
 694			break;
 695		}
 696	}
 697	if ( ! $distro ) {
 698		$wp_filesystem->delete( $from, true );
 699		return new WP_Error( 'insane_distro', __('The update could not be unpacked') );
 700	}
 701
 702	// Import $wp_version, $required_php_version, and $required_mysql_version from the new version
 703	// $wp_filesystem->wp_content_dir() returned unslashed pre-2.8
 704	$versions_file = trailingslashit( $wp_filesystem->wp_content_dir() ) . 'upgrade/version-current.php';
 705	if ( ! $wp_filesystem->copy( $from . $distro . 'wp-includes/version.php', $versions_file ) ) {
 706		 $wp_filesystem->delete( $from, true );
 707		 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' );
 708	}
 709
 710	$wp_filesystem->chmod( $versions_file, FS_CHMOD_FILE );
 711	require( WP_CONTENT_DIR . '/upgrade/version-current.php' );
 712	$wp_filesystem->delete( $versions_file );
 713
 714	$php_version    = phpversion();
 715	$mysql_version  = $wpdb->db_version();
 716	$old_wp_version = $GLOBALS['wp_version']; // The version of WordPress we're updating from
 717	$development_build = ( false !== strpos( $old_wp_version . $wp_version, '-' )  ); // a dash in the version indicates a Development release
 718	$php_compat     = version_compare( $php_version, $required_php_version, '>=' );
 719	if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) )
 720		$mysql_compat = true;
 721	else
 722		$mysql_compat = version_compare( $mysql_version, $required_mysql_version, '>=' );
 723
 724	if ( !$mysql_compat || !$php_compat )
 725		$wp_filesystem->delete($from, true);
 726
 727	if ( !$mysql_compat && !$php_compat )
 728		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, $mysql_version ) );
 729	elseif ( !$php_compat )
 730		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, $php_version ) );
 731	elseif ( !$mysql_compat )
 732		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 ) );
 733
 734	apply_filters( 'update_feedback', __( 'Preparing to install the latest version&#8230;' ) );
 735
 736	// Don't copy wp-content, we'll deal with that below
 737	$skip = array( 'wp-content' );
 738	$check_is_writable = array();
 739
 740	// Check to see which files don't really need updating - only available for 3.7 and higher
 741	if ( function_exists( 'get_core_checksums' ) ) {
 742		// Find the local version of the working directory
 743		$working_dir_local = WP_CONTENT_DIR . '/upgrade/' . basename( $from ) . $distro;
 744
 745		$checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );
 746		if ( is_array( $checksums ) && isset( $checksums[ $wp_version ] ) )
 747			$checksums = $checksums[ $wp_version ]; // Compat code for 3.7-beta2
 748		if ( is_array( $checksums ) ) {
 749			foreach( $checksums as $file => $checksum ) {
 750				if ( 'wp-content' == substr( $file, 0, 10 ) )
 751					continue;
 752				if ( ! file_exists( ABSPATH . $file ) )
 753					continue;
 754				if ( ! file_exists( $working_dir_local . $file ) )
 755					continue;
 756				if ( md5_file( ABSPATH . $file ) === $checksum )
 757					$skip[] = $file;
 758				else
 759					$check_is_writable[ $file ] = ABSPATH . $file;
 760			}
 761		}
 762	}
 763
 764	// If we're using the direct method, we can predict write failures that are due to permissions.
 765	if ( $check_is_writable && 'direct' === $wp_filesystem->method ) {
 766		$files_writable = array_filter( $check_is_writable, array( $wp_filesystem, 'is_writable' ) );
 767		if ( $files_writable !== $check_is_writable ) {
 768			$files_not_writable = array_diff_key( $check_is_writable, $files_writable );
 769			foreach ( $files_not_writable as $relative_file_not_writable => $file_not_writable ) {
 770				// If the writable check failed, chmod file to 0644 and try again, same as copy_dir().
 771				$wp_filesystem->chmod( $file_not_writable, FS_CHMOD_FILE );
 772				if ( $wp_filesystem->is_writable( $file_not_writable ) )
 773					unset( $files_not_writable[ $relative_file_not_writable ] );
 774			}
 775
 776			// Store package-relative paths (the key) of non-writable files in the WP_Error object.
 777			$error_data = version_compare( $old_wp_version, '3.7-beta2', '>' ) ? array_keys( $files_not_writable ) : '';
 778
 779			if ( $files_not_writable )
 780				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 ) );
 781		}
 782	}
 783
 784	apply_filters( 'update_feedback', __( 'Enabling Maintenance mode&#8230;' ) );
 785	// Create maintenance file to signal that we are upgrading
 786	$maintenance_string = '<?php $upgrading = ' . time() . '; ?>';
 787	$maintenance_file = $to . '.maintenance';
 788	$wp_filesystem->delete($maintenance_file);
 789	$wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE);
 790
 791	apply_filters( 'update_feedback', __( 'Copying the required files&#8230;' ) );
 792	// Copy new versions of WP files into place.
 793	$result = _copy_dir( $from . $distro, $to, $skip );
 794	if ( is_wp_error( $result ) )
 795		$result = new WP_Error( $result->get_error_code(), $result->get_error_message(), substr( $result->get_error_data(), strlen( $to ) ) );
 796
 797	// Check to make sure everything copied correctly, ignoring the contents of wp-content
 798	$skip = array( 'wp-content' );
 799	$failed = array();
 800	if ( isset( $checksums ) && is_array( $checksums ) ) {
 801		foreach ( $checksums as $file => $checksum ) {
 802			if ( 'wp-content' == substr( $file, 0, 10 ) )
 803				continue;
 804			if ( ! file_exists( $working_dir_local . $file ) )
 805				continue;
 806			if ( file_exists( ABSPATH . $file ) && md5_file( ABSPATH . $file ) == $checksum )
 807				$skip[] = $file;
 808			else
 809				$failed[] = $file;
 810		}
 811	}
 812
 813	// Some files didn't copy properly
 814	if ( ! empty( $failed ) ) {
 815		$total_size = 0;
 816		foreach ( $failed as $file ) {
 817			if ( file_exists( $working_dir_local . $file ) )
 818				$total_size += filesize( $working_dir_local . $file );
 819		}
 820
 821		// If we don't have enough free space, it isn't worth trying again.
 822		// Unlikely to be hit due to the check in unzip_file().
 823		$available_space = @disk_free_space( ABSPATH );
 824		if ( $available_space && $total_size >= $available_space ) {
 825			$result = new WP_Error( 'disk_full', __( 'There is not enough free disk space to complete the update.' ) );
 826		} else {
 827			$result = _copy_dir( $from . $distro, $to, $skip );
 828			if ( is_wp_error( $result ) )
 829				$result = new WP_Error( $result->get_error_code() . '_retry', $result->get_error_message(), substr( $result->get_error_data(), strlen( $to ) ) );
 830		}
 831	}
 832
 833	// Custom Content Directory needs updating now.
 834	// Copy Languages
 835	if ( !is_wp_error($result) && $wp_filesystem->is_dir($from . $distro . 'wp-content/languages') ) {
 836		if ( WP_LANG_DIR != ABSPATH . WPINC . '/languages' || @is_dir(WP_LANG_DIR) )
 837			$lang_dir = WP_LANG_DIR;
 838		else
 839			$lang_dir = WP_CONTENT_DIR . '/languages';
 840
 841		if ( !@is_dir($lang_dir) && 0 === strpos($lang_dir, ABSPATH) ) { // Check the language directory exists first
 842			$wp_filesystem->mkdir($to . str_replace(ABSPATH, '', $lang_dir), FS_CHMOD_DIR); // If it's within the ABSPATH we can handle it here, otherwise they're out of luck.
 843			clearstatcache(); // for FTP, Need to clear the stat cache
 844		}
 845
 846		if ( @is_dir($lang_dir) ) {
 847			$wp_lang_dir = $wp_filesystem->find_folder($lang_dir);
 848			if ( $wp_lang_dir ) {
 849				$result = copy_dir($from . $distro . 'wp-content/languages/', $wp_lang_dir);
 850				if ( is_wp_error( $result ) )
 851					$result = new WP_Error( $result->get_error_code() . '_languages', $result->get_error_message(), substr( $result->get_error_data(), strlen( $wp_lang_dir ) ) );
 852			}
 853		}
 854	}
 855
 856	apply_filters( 'update_feedback', __( 'Disabling Maintenance mode&#8230;' ) );
 857	// Remove maintenance file, we're done with potential site-breaking changes
 858	$wp_filesystem->delete( $maintenance_file );
 859
 860	// 3.5 -> 3.5+ - an empty twentytwelve directory was created upon upgrade to 3.5 for some users, preventing installation of Twenty Twelve.
 861	if ( '3.5' == $old_wp_version ) {
 862		if ( is_dir( WP_CONTENT_DIR . '/themes/twentytwelve' ) && ! file_exists( WP_CONTENT_DIR . '/themes/twentytwelve/style.css' )  ) {
 863			$wp_filesystem->delete( $wp_filesystem->wp_themes_dir() . 'twentytwelve/' );
 864		}
 865	}
 866
 867	// Copy New bundled plugins & themes
 868	// This gives us the ability to install new plugins & themes bundled with future versions of WordPress whilst avoiding the re-install upon upgrade issue.
 869	// $development_build controls us overwriting bundled themes and plugins when a non-stable release is being updated
 870	if ( !is_wp_error($result) && ( ! defined('CORE_UPGRADE_SKIP_NEW_BUNDLED') || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
 871		foreach ( (array) $_new_bundled_files as $file => $introduced_version ) {
 872			// If a $development_build or if $introduced version is greater than what the site was previously running
 873			if ( $development_build || version_compare( $introduced_version, $old_wp_version, '>' ) ) {
 874				$directory = ('/' == $file[ strlen($file)-1 ]);
 875				list($type, $filename) = explode('/', $file, 2);
 876
 877				// Check to see if the bundled items exist before attempting to copy them
 878				if ( ! $wp_filesystem->exists( $from . $distro . 'wp-content/' . $file ) )
 879					continue;
 880
 881				if ( 'plugins' == $type )
 882					$dest = $wp_filesystem->wp_plugins_dir();
 883				elseif ( 'themes' == $type )
 884					$dest = trailingslashit($wp_filesystem->wp_themes_dir()); // Back-compat, ::wp_themes_dir() did not return trailingslash'd pre-3.2
 885				else
 886					continue;
 887
 888				if ( ! $directory ) {
 889					if ( ! $development_build && $wp_filesystem->exists( $dest . $filename ) )
 890						continue;
 891
 892					if ( ! $wp_filesystem->copy($from . $distro . 'wp-content/' . $file, $dest . $filename, FS_CHMOD_FILE) )
 893						$result = new WP_Error( "copy_failed_for_new_bundled_$type", __( 'Could not copy file.' ), $dest . $filename );
 894				} else {
 895					if ( ! $development_build && $wp_filesystem->is_dir( $dest . $filename ) )
 896						continue;
 897
 898					$wp_filesystem->mkdir($dest . $filename, FS_CHMOD_DIR);
 899					$_result = copy_dir( $from . $distro . 'wp-content/' . $file, $dest . $filename);
 900
 901					// If a error occurs partway through this final step, keep the error flowing through, but keep process going.
 902					if ( is_wp_error( $_result ) ) {
 903						if ( ! is_wp_error( $result ) )
 904							$result = new WP_Error;
 905						$result->add( $_result->get_error_code() . "_$type", $_result->get_error_message(), substr( $_result->get_error_data(), strlen( $dest ) ) );
 906					}
 907				}
 908			}
 909		} //end foreach
 910	}
 911
 912	// Handle $result error from the above blocks
 913	if ( is_wp_error($result) ) {
 914		$wp_filesystem->delete($from, true);
 915		return $result;
 916	}
 917
 918	// Remove old files
 919	foreach ( $_old_files as $old_file ) {
 920		$old_file = $to . $old_file;
 921		if ( !$wp_filesystem->exists($old_file) )
 922			continue;
 923		$wp_filesystem->delete($old_file, true);
 924	}
 925
 926	// Upgrade DB with separate request
 927	apply_filters('update_feedback', __('Upgrading database&#8230;'));
 928	$db_upgrade_url = admin_url('upgrade.php?step=upgrade_db');
 929	wp_remote_post($db_upgrade_url, array('timeout' => 60));
 930
 931	// Clear the cache to prevent an update_option() from saving a stale db_version to the cache
 932	wp_cache_flush();
 933	// (Not all cache backends listen to 'flush')
 934	wp_cache_delete( 'alloptions', 'options' );
 935
 936	// Remove working directory
 937	$wp_filesystem->delete($from, true);
 938
 939	// Force refresh of update information
 940	if ( function_exists('delete_site_transient') )
 941		delete_site_transient('update_core');
 942	else
 943		delete_option('update_core');
 944
 945	// If we made it this far:
 946	do_action( '_core_updated_successfully', $wp_version );
 947
 948	// Clear the option that blocks auto updates after failures, now that we've been successful.
 949	if ( function_exists( 'delete_site_option' ) )
 950		delete_site_option( 'auto_core_update_failed' );
 951
 952	return $wp_version;
 953}
 954
 955/**
 956 * Copies a directory from one location to another via the WordPress Filesystem Abstraction.
 957 * Assumes that WP_Filesystem() has already been called and setup.
 958 *
 959 * This is a temporary function for the 3.1 -> 3.2 upgrade, as well as for those upgrading to
 960 * 3.7+
 961 *
 962 * @ignore
 963 * @since 3.2.0
 964 * @since 3.7.0 Updated not to use a regular expression for the skip list
 965 * @see copy_dir()
 966 *
 967 * @param string $from source directory
 968 * @param string $to destination directory
 969 * @param array $skip_list a list of files/folders to skip copying
 970 * @return mixed WP_Error on failure, True on success.
 971 */
 972function _copy_dir($from, $to, $skip_list = array() ) {
 973	global $wp_filesystem;
 974
 975	$dirlist = $wp_filesystem->dirlist($from);
 976
 977	$from = trailingslashit($from);
 978	$to = trailingslashit($to);
 979
 980	foreach ( (array) $dirlist as $filename => $fileinfo ) {
 981		if ( in_array( $filename, $skip_list ) )
 982			continue;
 983
 984		if ( 'f' == $fileinfo['type'] ) {
 985			if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) ) {
 986				// If copy failed, chmod file to 0644 and try again.
 987				$wp_filesystem->chmod( $to . $filename, FS_CHMOD_FILE );
 988				if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) )
 989					return new WP_Error( 'copy_failed__copy_dir', __( 'Could not copy file.' ), $to . $filename );
 990			}
 991		} elseif ( 'd' == $fileinfo['type'] ) {
 992			if ( !$wp_filesystem->is_dir($to . $filename) ) {
 993				if ( !$wp_filesystem->mkdir($to . $filename, FS_CHMOD_DIR) )
 994					return new WP_Error( 'mkdir_failed__copy_dir', __( 'Could not create directory.' ), $to . $filename );
 995			}
 996
 997			// generate the $sub_skip_list for the subdirectory as a sub-set of the existing $skip_list
 998			$sub_skip_list = array();
 999			foreach ( $skip_list as $skip_item ) {
1000				if ( 0 === strpos( $skip_item, $filename . '/' ) )
1001					$sub_skip_list[] = preg_replace( '!^' . preg_quote( $filename, '!' ) . '/!i', '', $skip_item );
1002			}
1003
1004			$result = _copy_dir($from . $filename, $to . $filename, $sub_skip_list);
1005			if ( is_wp_error($result) )
1006				return $result;
1007		}
1008	}
1009	return true;
1010}
1011
1012/**
1013 * Redirect to the About WordPress page after a successful upgrade.
1014 *
1015 * This function is only needed when the existing install is older than 3.4.0.
1016 *
1017 * @since 3.3.0
1018 *
1019 */
1020function _redirect_to_about_wordpress( $new_version ) {
1021	global $wp_version, $pagenow, $action;
1022
1023	if ( version_compare( $wp_version, '3.4-RC1', '>=' ) )
1024		return;
1025
1026	// Ensure we only run this on the update-core.php page. The Core_Upgrader may be used in other contexts.
1027	if ( 'update-core.php' != $pagenow )
1028		return;
1029
1030 	if ( 'do-core-upgrade' != $action && 'do-core-reinstall' != $action )
1031 		return;
1032
1033	// Load the updated default text localization domain for new strings
1034	load_default_textdomain();
1035
1036	// See do_core_upgrade()
1037	show_message( __('WordPress updated successfully') );
1038
1039	// self_admin_url() won't exist when upgrading from <= 3.0, so relative URLs are intentional.
1040	show_message( '<span class="hide-if-no-js">' . sprintf( __( 'Welcome to WordPress %1$s. You will be redirected to the About WordPress screen. If not, click <a href="%2$s">here</a>.' ), $new_version, 'about.php?updated' ) . '</span>' );
1041	show_message( '<span class="hide-if-js">' . sprintf( __( 'Welcome to WordPress %1$s. <a href="%2$s">Learn more</a>.' ), $new_version, 'about.php?updated' ) . '</span>' );
1042	echo '</div>';
1043	?>
1044<script type="text/javascript">
1045window.location = 'about.php?updated';
1046</script>
1047	<?php
1048
1049	// Include admin-footer.php and exit
1050	include(ABSPATH . 'wp-admin/admin-footer.php');
1051	exit();
1052}
1053add_action( '_core_updated_successfully', '_redirect_to_about_wordpress' );