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/wp-admin/update-core.php

https://gitlab.com/duban-alexei/WordPress
PHP | 693 lines | 520 code | 93 blank | 80 comment | 139 complexity | 425cc67d83d32aac62e1fd8f7393f552 MD5 | raw file
  1<?php
  2/**
  3 * Update Core administration panel.
  4 *
  5 * @package WordPress
  6 * @subpackage Administration
  7 */
  8
  9/** WordPress Administration Bootstrap */
 10require_once( dirname( __FILE__ ) . '/admin.php' );
 11
 12wp_enqueue_style( 'plugin-install' );
 13wp_enqueue_script( 'plugin-install' );
 14wp_enqueue_script( 'updates' );
 15add_thickbox();
 16
 17if ( is_multisite() && ! is_network_admin() ) {
 18	wp_redirect( network_admin_url( 'update-core.php' ) );
 19	exit();
 20}
 21
 22if ( ! current_user_can( 'update_core' ) && ! current_user_can( 'update_themes' ) && ! current_user_can( 'update_plugins' ) )
 23	wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
 24
 25/**
 26 *
 27 * @global string $wp_local_package
 28 * @global wpdb   $wpdb
 29 * @global string $wp_version
 30 *
 31 * @staticvar bool $first_pass
 32 *
 33 * @param object $update
 34 */
 35function list_core_update( $update ) {
 36 	global $wp_local_package, $wpdb, $wp_version;
 37  	static $first_pass = true;
 38
 39 	if ( 'en_US' == $update->locale && 'en_US' == get_locale() )
 40 		$version_string = $update->current;
 41 	// If the only available update is a partial builds, it doesn't need a language-specific version string.
 42 	elseif ( 'en_US' == $update->locale && $update->packages->partial && $wp_version == $update->partial_version && ( $updates = get_core_updates() ) && 1 == count( $updates ) )
 43 		$version_string = $update->current;
 44 	else
 45 		$version_string = sprintf( "%s&ndash;<strong>%s</strong>", $update->current, $update->locale );
 46
 47	$current = false;
 48	if ( !isset($update->response) || 'latest' == $update->response )
 49		$current = true;
 50	$submit = __('Update Now');
 51	$form_action = 'update-core.php?action=do-core-upgrade';
 52	$php_version    = phpversion();
 53	$mysql_version  = $wpdb->db_version();
 54	$show_buttons = true;
 55	if ( 'development' == $update->response ) {
 56		$message = __('You are using a development version of WordPress. You can update to the latest nightly build automatically or download the nightly build and install it manually:');
 57		$download = __('Download nightly build');
 58	} else {
 59		if ( $current ) {
 60			$message = sprintf( __( 'If you need to re-install version %s, you can do so here or download the package and re-install manually:' ), $version_string );
 61			$submit = __('Re-install Now');
 62			$form_action = 'update-core.php?action=do-core-reinstall';
 63		} else {
 64			$php_compat     = version_compare( $php_version, $update->php_version, '>=' );
 65			if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) )
 66				$mysql_compat = true;
 67			else
 68				$mysql_compat = version_compare( $mysql_version, $update->mysql_version, '>=' );
 69
 70			if ( !$mysql_compat && !$php_compat )
 71				$message = sprintf( __('You cannot update because <a href="https://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.'), $update->current, $update->php_version, $update->mysql_version, $php_version, $mysql_version );
 72			elseif ( !$php_compat )
 73				$message = sprintf( __('You cannot update because <a href="https://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires PHP version %2$s or higher. You are running version %3$s.'), $update->current, $update->php_version, $php_version );
 74			elseif ( !$mysql_compat )
 75				$message = sprintf( __('You cannot update because <a href="https://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires MySQL version %2$s or higher. You are running version %3$s.'), $update->current, $update->mysql_version, $mysql_version );
 76			else
 77				$message = 	sprintf(__('You can update to <a href="https://codex.wordpress.org/Version_%1$s">WordPress %2$s</a> automatically or download the package and install it manually:'), $update->current, $version_string);
 78			if ( !$mysql_compat || !$php_compat )
 79				$show_buttons = false;
 80		}
 81		$download = sprintf(__('Download %s'), $version_string);
 82	}
 83
 84	echo '<p>';
 85	echo $message;
 86	echo '</p>';
 87	echo '<form method="post" action="' . $form_action . '" name="upgrade" class="upgrade">';
 88	wp_nonce_field('upgrade-core');
 89	echo '<p>';
 90	echo '<input name="version" value="'. esc_attr($update->current) .'" type="hidden"/>';
 91	echo '<input name="locale" value="'. esc_attr($update->locale) .'" type="hidden"/>';
 92	if ( $show_buttons ) {
 93		if ( $first_pass ) {
 94			submit_button( $submit, $current ? 'button' : 'primary regular', 'upgrade', false );
 95			$first_pass = false;
 96		} else {
 97			submit_button( $submit, 'button', 'upgrade', false );
 98		}
 99		echo '&nbsp;<a href="' . esc_url( $update->download ) . '" class="button">' . $download . '</a>&nbsp;';
100	}
101	if ( 'en_US' != $update->locale )
102		if ( !isset( $update->dismissed ) || !$update->dismissed )
103			submit_button( __('Hide this update'), 'button', 'dismiss', false );
104		else
105			submit_button( __('Bring back this update'), 'button', 'undismiss', false );
106	echo '</p>';
107	if ( 'en_US' != $update->locale && ( !isset($wp_local_package) || $wp_local_package != $update->locale ) )
108	    echo '<p class="hint">'.__('This localized version contains both the translation and various other localization fixes. You can skip upgrading if you want to keep your current translation.').'</p>';
109	// Partial builds don't need language-specific warnings.
110	elseif ( 'en_US' == $update->locale && get_locale() != 'en_US' && ( ! $update->packages->partial && $wp_version == $update->partial_version ) ) {
111	    echo '<p class="hint">'.sprintf( __('You are about to install WordPress %s <strong>in English (US).</strong> There is a chance this update will break your translation. You may prefer to wait for the localized version to be released.'), $update->response != 'development' ? $update->current : '' ).'</p>';
112	}
113	echo '</form>';
114
115}
116
117/**
118 * @since 2.7.0
119 */
120function dismissed_updates() {
121	$dismissed = get_core_updates( array( 'dismissed' => true, 'available' => false ) );
122	if ( $dismissed ) {
123
124		$show_text = esc_js(__('Show hidden updates'));
125		$hide_text = esc_js(__('Hide hidden updates'));
126	?>
127	<script type="text/javascript">
128
129		jQuery(function($) {
130			$('dismissed-updates').show();
131			$('#show-dismissed').toggle(function(){$(this).text('<?php echo $hide_text; ?>');}, function() {$(this).text('<?php echo $show_text; ?>')});
132			$('#show-dismissed').click(function() { $('#dismissed-updates').toggle('slow');});
133		});
134	</script>
135	<?php
136		echo '<p class="hide-if-no-js"><a id="show-dismissed" href="#">'.__('Show hidden updates').'</a></p>';
137		echo '<ul id="dismissed-updates" class="core-updates dismissed">';
138		foreach( (array) $dismissed as $update) {
139			echo '<li>';
140			list_core_update( $update );
141			echo '</li>';
142		}
143		echo '</ul>';
144	}
145}
146
147/**
148 * Display upgrade WordPress for downloading latest or upgrading automatically form.
149 *
150 * @since 2.7.0
151 *
152 * @global string $wp_version
153 * @global string $required_php_version
154 * @global string $required_mysql_version
155 */
156function core_upgrade_preamble() {
157	global $wp_version, $required_php_version, $required_mysql_version;
158
159	$updates = get_core_updates();
160
161	if ( !isset($updates[0]->response) || 'latest' == $updates[0]->response ) {
162		echo '<h3>';
163		_e('You have the latest version of WordPress.');
164
165		if ( wp_http_supports( array( 'ssl' ) ) ) {
166			require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
167			$upgrader = new WP_Automatic_Updater;
168			$future_minor_update = (object) array(
169				'current'       => $wp_version . '.1.next.minor',
170				'version'       => $wp_version . '.1.next.minor',
171				'php_version'   => $required_php_version,
172				'mysql_version' => $required_mysql_version,
173			);
174			$should_auto_update = $upgrader->should_update( 'core', $future_minor_update, ABSPATH );
175			if ( $should_auto_update )
176				echo ' ' . __( 'Future security updates will be applied automatically.' );
177		}
178		echo '</h3>';
179	} else {
180		echo '<div class="notice notice-warning"><p>';
181		_e('<strong>Important:</strong> before updating, please <a href="https://codex.wordpress.org/WordPress_Backups">back up your database and files</a>. For help with updates, visit the <a href="https://codex.wordpress.org/Updating_WordPress">Updating WordPress</a> Codex page.');
182		echo '</p></div>';
183
184		echo '<h3 class="response">';
185		_e( 'An updated version of WordPress is available.' );
186		echo '</h3>';
187	}
188
189	if ( isset( $updates[0] ) && $updates[0]->response == 'development' ) {
190		require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
191		$upgrader = new WP_Automatic_Updater;
192		if ( wp_http_supports( 'ssl' ) && $upgrader->should_update( 'core', $updates[0], ABSPATH ) ) {
193			echo '<div class="updated inline"><p>';
194			echo '<strong>' . __( 'BETA TESTERS:' ) . '</strong> ' . __( 'This site is set up to install updates of future beta versions automatically.' );
195			echo '</p></div>';
196		}
197	}
198
199	echo '<ul class="core-updates">';
200	foreach( (array) $updates as $update ) {
201		echo '<li>';
202		list_core_update( $update );
203		echo '</li>';
204	}
205	echo '</ul>';
206	// Don't show the maintenance mode notice when we are only showing a single re-install option.
207	if ( $updates && ( count( $updates ) > 1 || $updates[0]->response != 'latest' ) ) {
208		echo '<p>' . __( 'While your site is being updated, it will be in maintenance mode. As soon as your updates are complete, your site will return to normal.' ) . '</p>';
209	} elseif ( ! $updates ) {
210		list( $normalized_version ) = explode( '-', $wp_version );
211		echo '<p>' . sprintf( __( '<a href="%s">Learn more about WordPress %s</a>.' ), esc_url( self_admin_url( 'about.php' ) ), $normalized_version ) . '</p>';
212	}
213	dismissed_updates();
214}
215
216/**
217 *
218 * @global string $wp_version
219 */
220function list_plugin_updates() {
221	global $wp_version;
222
223	$cur_wp_version = preg_replace('/-.*$/', '', $wp_version);
224
225	require_once(ABSPATH . 'wp-admin/includes/plugin-install.php');
226	$plugins = get_plugin_updates();
227	if ( empty( $plugins ) ) {
228		echo '<h3>' . __( 'Plugins' ) . '</h3>';
229		echo '<p>' . __( 'Your plugins are all up to date.' ) . '</p>';
230		return;
231	}
232	$form_action = 'update-core.php?action=do-plugin-upgrade';
233
234	$core_updates = get_core_updates();
235	if ( !isset($core_updates[0]->response) || 'latest' == $core_updates[0]->response || 'development' == $core_updates[0]->response || version_compare( $core_updates[0]->current, $cur_wp_version, '=') )
236		$core_update_version = false;
237	else
238		$core_update_version = $core_updates[0]->current;
239	?>
240<h3><?php _e( 'Plugins' ); ?></h3>
241<p><?php _e( 'The following plugins have new versions available. Check the ones you want to update and then click &#8220;Update Plugins&#8221;.' ); ?></p>
242<form method="post" action="<?php echo esc_url( $form_action ); ?>" name="upgrade-plugins" class="upgrade">
243<?php wp_nonce_field('upgrade-core'); ?>
244<p><input id="upgrade-plugins" class="button" type="submit" value="<?php esc_attr_e('Update Plugins'); ?>" name="upgrade" /></p>
245<table class="widefat" id="update-plugins-table">
246	<thead>
247	<tr>
248		<th scope="col" class="manage-column check-column"><input type="checkbox" id="plugins-select-all" /></th>
249		<th scope="col" class="manage-column"><label for="plugins-select-all"><?php _e('Select All'); ?></label></th>
250	</tr>
251	</thead>
252
253	<tbody class="plugins">
254<?php
255	foreach ( (array) $plugins as $plugin_file => $plugin_data) {
256		$info = plugins_api('plugin_information', array('slug' => $plugin_data->update->slug ));
257		if ( is_wp_error( $info ) ) {
258			$info = false;
259		}
260
261		// Get plugin compat for running version of WordPress.
262		if ( isset($info->tested) && version_compare($info->tested, $cur_wp_version, '>=') ) {
263			$compat = '<br />' . sprintf(__('Compatibility with WordPress %1$s: 100%% (according to its author)'), $cur_wp_version);
264		} elseif ( isset($info->compatibility[$cur_wp_version][$plugin_data->update->new_version]) ) {
265			$compat = $info->compatibility[$cur_wp_version][$plugin_data->update->new_version];
266			$compat = '<br />' . sprintf(__('Compatibility with WordPress %1$s: %2$d%% (%3$d "works" votes out of %4$d total)'), $cur_wp_version, $compat[0], $compat[2], $compat[1]);
267		} else {
268			$compat = '<br />' . sprintf(__('Compatibility with WordPress %1$s: Unknown'), $cur_wp_version);
269		}
270		// Get plugin compat for updated version of WordPress.
271		if ( $core_update_version ) {
272			if ( isset($info->compatibility[$core_update_version][$plugin_data->update->new_version]) ) {
273				$update_compat = $info->compatibility[$core_update_version][$plugin_data->update->new_version];
274				$compat .= '<br />' . sprintf(__('Compatibility with WordPress %1$s: %2$d%% (%3$d "works" votes out of %4$d total)'), $core_update_version, $update_compat[0], $update_compat[2], $update_compat[1]);
275			} else {
276				$compat .= '<br />' . sprintf(__('Compatibility with WordPress %1$s: Unknown'), $core_update_version);
277			}
278		}
279		// Get the upgrade notice for the new plugin version.
280		if ( isset($plugin_data->update->upgrade_notice) ) {
281			$upgrade_notice = '<br />' . strip_tags($plugin_data->update->upgrade_notice);
282		} else {
283			$upgrade_notice = '';
284		}
285
286		$details_url = self_admin_url('plugin-install.php?tab=plugin-information&plugin=' . $plugin_data->update->slug . '&section=changelog&TB_iframe=true&width=640&height=662');
287		$details_text = sprintf(__('View version %1$s details'), $plugin_data->update->new_version);
288		$details = sprintf('<a href="%1$s" class="thickbox" title="%2$s">%3$s</a>.', esc_url($details_url), esc_attr($plugin_data->Name), $details_text);
289
290		echo "
291	<tr>
292		<th scope='row' class='check-column'><input type='checkbox' name='checked[]' value='" . esc_attr($plugin_file) . "' /></th>
293		<td><p><strong>{$plugin_data->Name}</strong><br />" . sprintf(__('You have version %1$s installed. Update to %2$s.'), $plugin_data->Version, $plugin_data->update->new_version) . ' ' . $details . $compat . $upgrade_notice . "</p></td>
294	</tr>";
295	}
296?>
297	</tbody>
298
299	<tfoot>
300	<tr>
301		<th scope="col" class="manage-column check-column"><input type="checkbox" id="plugins-select-all-2" /></th>
302		<th scope="col" class="manage-column"><label for="plugins-select-all-2"><?php _e( 'Select All' ); ?></label></th>
303	</tr>
304	</tfoot>
305</table>
306<p><input id="upgrade-plugins-2" class="button" type="submit" value="<?php esc_attr_e('Update Plugins'); ?>" name="upgrade" /></p>
307</form>
308<?php
309}
310
311/**
312 * @since 2.9.0
313 */
314function list_theme_updates() {
315	$themes = get_theme_updates();
316	if ( empty( $themes ) ) {
317		echo '<h3>' . __( 'Themes' ) . '</h3>';
318		echo '<p>' . __( 'Your themes are all up to date.' ) . '</p>';
319		return;
320	}
321
322	$form_action = 'update-core.php?action=do-theme-upgrade';
323?>
324<h3><?php _e( 'Themes' ); ?></h3>
325<p><?php _e( 'The following themes have new versions available. Check the ones you want to update and then click &#8220;Update Themes&#8221;.' ); ?></p>
326<p><?php printf( __( '<strong>Please Note:</strong> Any customizations you have made to theme files will be lost. Please consider using <a href="%s">child themes</a> for modifications.' ), __( 'https://codex.wordpress.org/Child_Themes' ) ); ?></p>
327<form method="post" action="<?php echo esc_url( $form_action ); ?>" name="upgrade-themes" class="upgrade">
328<?php wp_nonce_field('upgrade-core'); ?>
329<p><input id="upgrade-themes" class="button" type="submit" value="<?php esc_attr_e('Update Themes'); ?>" name="upgrade" /></p>
330<table class="widefat" id="update-themes-table">
331	<thead>
332	<tr>
333		<th scope="col" class="manage-column check-column"><input type="checkbox" id="themes-select-all" /></th>
334		<th scope="col" class="manage-column"><label for="themes-select-all"><?php _e('Select All'); ?></label></th>
335	</tr>
336	</thead>
337
338	<tbody class="plugins">
339<?php
340	foreach ( $themes as $stylesheet => $theme ) {
341		echo "
342	<tr>
343		<th scope='row' class='check-column'><input type='checkbox' name='checked[]' value='" . esc_attr( $stylesheet ) . "' /></th>
344		<td class='plugin-title'><img src='" . esc_url( $theme->get_screenshot() ) . "' width='85' height='64' style='float:left; padding: 0 5px 5px' /><strong>" . $theme->display('Name') . '</strong> ' . sprintf( __( 'You have version %1$s installed. Update to %2$s.' ), $theme->display('Version'), $theme->update['new_version'] ) . "</td>
345	</tr>";
346	}
347?>
348	</tbody>
349
350	<tfoot>
351	<tr>
352		<th scope="col" class="manage-column check-column"><input type="checkbox" id="themes-select-all-2" /></th>
353		<th scope="col" class="manage-column"><label for="themes-select-all-2"><?php _e( 'Select All' ); ?></label></th>
354	</tr>
355	</tfoot>
356</table>
357<p><input id="upgrade-themes-2" class="button" type="submit" value="<?php esc_attr_e('Update Themes'); ?>" name="upgrade" /></p>
358</form>
359<?php
360}
361
362/**
363 * @since 3.7.0
364 */
365function list_translation_updates() {
366	$updates = wp_get_translation_updates();
367	if ( ! $updates ) {
368		if ( 'en_US' != get_locale() ) {
369			echo '<h3>' . __( 'Translations' ) . '</h3>';
370			echo '<p>' . __( 'Your translations are all up to date.' ) . '</p>';
371		}
372		return;
373	}
374
375	$form_action = 'update-core.php?action=do-translation-upgrade';
376	?>
377	<h3><?php _e( 'Translations' ); ?></h3>
378	<form method="post" action="<?php echo esc_url( $form_action ); ?>" name="upgrade-translations" class="upgrade">
379		<p><?php _e( 'New translations are available.' ); ?></p>
380		<?php wp_nonce_field( 'upgrade-translations' ); ?>
381		<p><input class="button" type="submit" value="<?php esc_attr_e( 'Update Translations' ); ?>" name="upgrade" /></p>
382	</form>
383	<?php
384}
385
386/**
387 * Upgrade WordPress core display.
388 *
389 * @since 2.7.0
390 *
391 * @global WP_Filesystem_Base $wp_filesystem Subclass
392 *
393 * @param bool $reinstall
394 */
395function do_core_upgrade( $reinstall = false ) {
396	global $wp_filesystem;
397
398	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
399
400	if ( $reinstall )
401		$url = 'update-core.php?action=do-core-reinstall';
402	else
403		$url = 'update-core.php?action=do-core-upgrade';
404	$url = wp_nonce_url($url, 'upgrade-core');
405
406	$version = isset( $_POST['version'] )? $_POST['version'] : false;
407	$locale = isset( $_POST['locale'] )? $_POST['locale'] : 'en_US';
408	$update = find_core_update( $version, $locale );
409	if ( !$update )
410		return;
411
412	// Allow relaxed file ownership writes for User-initiated upgrades when the API specifies
413	// that it's safe to do so. This only happens when there are no new files to create.
414	$allow_relaxed_file_ownership = ! $reinstall && isset( $update->new_files ) && ! $update->new_files;
415
416?>
417	<div class="wrap">
418	<h2><?php _e('Update WordPress'); ?></h2>
419<?php
420
421	if ( false === ( $credentials = request_filesystem_credentials( $url, '', false, ABSPATH, array( 'version', 'locale' ), $allow_relaxed_file_ownership ) ) ) {
422		echo '</div>';
423		return;
424	}
425
426	if ( ! WP_Filesystem( $credentials, ABSPATH, $allow_relaxed_file_ownership ) ) {
427		// Failed to connect, Error and request again
428		request_filesystem_credentials( $url, '', true, ABSPATH, array( 'version', 'locale' ), $allow_relaxed_file_ownership );
429		echo '</div>';
430		return;
431	}
432
433	if ( $wp_filesystem->errors->get_error_code() ) {
434		foreach ( $wp_filesystem->errors->get_error_messages() as $message )
435			show_message($message);
436		echo '</div>';
437		return;
438	}
439
440	if ( $reinstall )
441		$update->response = 'reinstall';
442
443	add_filter( 'update_feedback', 'show_message' );
444
445	$upgrader = new Core_Upgrader();
446	$result = $upgrader->upgrade( $update, array(
447		'allow_relaxed_file_ownership' => $allow_relaxed_file_ownership
448	) );
449
450	if ( is_wp_error($result) ) {
451		show_message($result);
452		if ('up_to_date' != $result->get_error_code() )
453			show_message( __('Installation Failed') );
454		echo '</div>';
455		return;
456	}
457
458	show_message( __('WordPress updated successfully') );
459	show_message( '<span class="hide-if-no-js">' . sprintf( __( 'Welcome to WordPress %1$s. You will be redirected to the About WordPress screen. If not, click <a href="%2$s">here</a>.' ), $result, esc_url( self_admin_url( 'about.php?updated' ) ) ) . '</span>' );
460	show_message( '<span class="hide-if-js">' . sprintf( __( 'Welcome to WordPress %1$s. <a href="%2$s">Learn more</a>.' ), $result, esc_url( self_admin_url( 'about.php?updated' ) ) ) . '</span>' );
461	?>
462	</div>
463	<script type="text/javascript">
464	window.location = '<?php echo self_admin_url( 'about.php?updated' ); ?>';
465	</script>
466	<?php
467}
468
469/**
470 * @since 2.7.0
471 */
472function do_dismiss_core_update() {
473	$version = isset( $_POST['version'] )? $_POST['version'] : false;
474	$locale = isset( $_POST['locale'] )? $_POST['locale'] : 'en_US';
475	$update = find_core_update( $version, $locale );
476	if ( !$update )
477		return;
478	dismiss_core_update( $update );
479	wp_redirect( wp_nonce_url('update-core.php?action=upgrade-core', 'upgrade-core') );
480	exit;
481}
482
483/**
484 * @since 2.7.0
485 */
486function do_undismiss_core_update() {
487	$version = isset( $_POST['version'] )? $_POST['version'] : false;
488	$locale = isset( $_POST['locale'] )? $_POST['locale'] : 'en_US';
489	$update = find_core_update( $version, $locale );
490	if ( !$update )
491		return;
492	undismiss_core_update( $version, $locale );
493	wp_redirect( wp_nonce_url('update-core.php?action=upgrade-core', 'upgrade-core') );
494	exit;
495}
496
497$action = isset($_GET['action']) ? $_GET['action'] : 'upgrade-core';
498
499$upgrade_error = false;
500if ( ( 'do-theme-upgrade' == $action || ( 'do-plugin-upgrade' == $action && ! isset( $_GET['plugins'] ) ) )
501	&& ! isset( $_POST['checked'] ) ) {
502	$upgrade_error = $action == 'do-theme-upgrade' ? 'themes' : 'plugins';
503	$action = 'upgrade-core';
504}
505
506$title = __('WordPress Updates');
507$parent_file = 'index.php';
508
509$updates_overview  = '<p>' . __( 'On this screen, you can update to the latest version of WordPress, as well as update your themes and plugins from the WordPress.org repositories.' ) . '</p>';
510$updates_overview .= '<p>' . __( 'If an update is available, you&#8127;ll see a notification appear in the Toolbar and navigation menu.' ) . ' ' . __( 'Keeping your site updated is important for security. It also makes the internet a safer place for you and your readers.' ) . '</p>';
511
512get_current_screen()->add_help_tab( array(
513	'id'      => 'overview',
514	'title'   => __( 'Overview' ),
515	'content' => $updates_overview
516) );
517
518$updates_howto  = '<p>' . __( '<strong>WordPress</strong> &mdash; Updating your WordPress installation is a simple one-click procedure: just <strong>click on the &#8220;Update Now&#8221; button</strong> when you are notified that a new version is available.' ) . ' ' . __( 'In most cases, WordPress will automatically apply maintenance and security updates in the background for you.' ) . '</p>';
519$updates_howto .= '<p>' . __( '<strong>Themes and Plugins</strong> &mdash; To update individual themes or plugins from this screen, use the checkboxes to make your selection, then <strong>click on the appropriate &#8220;Update&#8221; button</strong>. To update all of your themes or plugins at once, you can check the box at the top of the section to select all before clicking the update button.' ) . '</p>';
520
521if ( 'en_US' != get_locale() ) {
522	$updates_howto .= '<p>' . __( '<strong>Translations</strong> &mdash; The files translating WordPress into your language are updated for you whenever any other updates occur. But if these files are out of date, you can <strong>click the &#8220;Update Translations&#8221;</strong> button.' ) . '</p>';
523}
524
525get_current_screen()->add_help_tab( array(
526	'id'      => 'how-to-update',
527	'title'   => __( 'How to Update' ),
528	'content' => $updates_howto
529) );
530
531get_current_screen()->set_help_sidebar(
532	'<p><strong>' . __('For more information:') . '</strong></p>' .
533	'<p>' . __( '<a href="https://codex.wordpress.org/Dashboard_Updates_Screen" target="_blank">Documentation on Updating WordPress</a>' ) . '</p>' .
534	'<p>' . __( '<a href="https://wordpress.org/support/" target="_blank">Support Forums</a>' ) . '</p>'
535);
536
537if ( 'upgrade-core' == $action ) {
538	// Force a update check when requested
539	$force_check = ! empty( $_GET['force-check'] );
540	wp_version_check( array(), $force_check );
541
542	require_once(ABSPATH . 'wp-admin/admin-header.php');
543	?>
544	<div class="wrap">
545	<h2><?php _e('WordPress Updates'); ?></h2>
546	<?php
547	if ( $upgrade_error ) {
548		echo '<div class="error"><p>';
549		if ( $upgrade_error == 'themes' )
550			_e('Please select one or more themes to update.');
551		else
552			_e('Please select one or more plugins to update.');
553		echo '</p></div>';
554	}
555
556	echo '<p>';
557	/* translators: %1 date, %2 time. */
558	printf( __('Last checked on %1$s at %2$s.'), date_i18n( get_option( 'date_format' ) ), date_i18n( get_option( 'time_format' ) ) );
559	echo ' &nbsp; <a class="button" href="' . esc_url( self_admin_url('update-core.php?force-check=1') ) . '">' . __( 'Check Again' ) . '</a>';
560	echo '</p>';
561
562	if ( $core = current_user_can( 'update_core' ) )
563		core_upgrade_preamble();
564	if ( $plugins = current_user_can( 'update_plugins' ) )
565		list_plugin_updates();
566	if ( $themes = current_user_can( 'update_themes' ) )
567		list_theme_updates();
568	if ( $core || $plugins || $themes )
569		list_translation_updates();
570	unset( $core, $plugins, $themes );
571	/**
572	 * Fires after the core, plugin, and theme update tables.
573	 *
574	 * @since 2.9.0
575	 */
576	do_action( 'core_upgrade_preamble' );
577	echo '</div>';
578	include(ABSPATH . 'wp-admin/admin-footer.php');
579
580} elseif ( 'do-core-upgrade' == $action || 'do-core-reinstall' == $action ) {
581
582	if ( ! current_user_can( 'update_core' ) )
583		wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
584
585	check_admin_referer('upgrade-core');
586
587	// Do the (un)dismiss actions before headers, so that they can redirect.
588	if ( isset( $_POST['dismiss'] ) )
589		do_dismiss_core_update();
590	elseif ( isset( $_POST['undismiss'] ) )
591		do_undismiss_core_update();
592
593	require_once(ABSPATH . 'wp-admin/admin-header.php');
594	if ( 'do-core-reinstall' == $action )
595		$reinstall = true;
596	else
597		$reinstall = false;
598
599	if ( isset( $_POST['upgrade'] ) )
600		do_core_upgrade($reinstall);
601
602	include(ABSPATH . 'wp-admin/admin-footer.php');
603
604} elseif ( 'do-plugin-upgrade' == $action ) {
605
606	if ( ! current_user_can( 'update_plugins' ) )
607		wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
608
609	check_admin_referer('upgrade-core');
610
611	if ( isset( $_GET['plugins'] ) ) {
612		$plugins = explode( ',', $_GET['plugins'] );
613	} elseif ( isset( $_POST['checked'] ) ) {
614		$plugins = (array) $_POST['checked'];
615	} else {
616		wp_redirect( admin_url('update-core.php') );
617		exit;
618	}
619
620	$url = 'update.php?action=update-selected&plugins=' . urlencode(implode(',', $plugins));
621	$url = wp_nonce_url($url, 'bulk-update-plugins');
622
623	$title = __('Update Plugins');
624
625	require_once(ABSPATH . 'wp-admin/admin-header.php');
626	echo '<div class="wrap">';
627	echo '<h2>' . esc_html__('Update Plugins') . '</h2>';
628	echo '<iframe src="', $url, '" style="width: 100%; height: 100%; min-height: 750px;" frameborder="0"></iframe>';
629	echo '</div>';
630	include(ABSPATH . 'wp-admin/admin-footer.php');
631
632} elseif ( 'do-theme-upgrade' == $action ) {
633
634	if ( ! current_user_can( 'update_themes' ) )
635		wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
636
637	check_admin_referer('upgrade-core');
638
639	if ( isset( $_GET['themes'] ) ) {
640		$themes = explode( ',', $_GET['themes'] );
641	} elseif ( isset( $_POST['checked'] ) ) {
642		$themes = (array) $_POST['checked'];
643	} else {
644		wp_redirect( admin_url('update-core.php') );
645		exit;
646	}
647
648	$url = 'update.php?action=update-selected-themes&themes=' . urlencode(implode(',', $themes));
649	$url = wp_nonce_url($url, 'bulk-update-themes');
650
651	$title = __('Update Themes');
652
653	require_once(ABSPATH . 'wp-admin/admin-header.php');
654	?>
655	<div class="wrap">
656		<h2><?php echo esc_html__('Update Themes') ?></h2>
657		<iframe src="<?php echo $url ?>" style="width: 100%; height: 100%; min-height: 750px;" frameborder="0"></iframe>
658	</div>
659	<?php
660	include(ABSPATH . 'wp-admin/admin-footer.php');
661
662} elseif ( 'do-translation-upgrade' == $action ) {
663
664	if ( ! current_user_can( 'update_core' ) && ! current_user_can( 'update_plugins' ) && ! current_user_can( 'update_themes' ) )
665		wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
666
667	check_admin_referer( 'upgrade-translations' );
668
669	require_once( ABSPATH . 'wp-admin/admin-header.php' );
670	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
671
672	$url = 'update-core.php?action=do-translation-upgrade';
673	$nonce = 'upgrade-translations';
674	$title = __( 'Update Translations' );
675	$context = WP_LANG_DIR;
676
677	$upgrader = new Language_Pack_Upgrader( new Language_Pack_Upgrader_Skin( compact( 'url', 'nonce', 'title', 'context' ) ) );
678	$result = $upgrader->bulk_upgrade();
679
680	require_once( ABSPATH . 'wp-admin/admin-footer.php' );
681
682} else {
683	/**
684	 * Fires for each custom update action on the WordPress Updates screen.
685	 *
686	 * The dynamic portion of the hook name, `$action`, refers to the
687	 * passed update action. The hook fires in lieu of all available
688	 * default update actions.
689	 *
690	 * @since 3.2.0
691	 */
692	do_action( "update-core-custom_{$action}" );
693}