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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 6 times in this file.
| Line | Code |
|---|---|
| 751 | * 2. Before Maintenance Mode is enabled. |
| 752 | * 3. Before WordPress begins copying over the necessary files. |
| 753 | * 4. Before Maintenance Mode is disabled. |
| 754 | * 5. Before the database is upgraded. |
| 755 | * |
| 756 | * @since 2.5.0 |
| 757 | * |
| 758 | * @param string $feedback The core update feedback messages. |
| 759 | */ |
| 760 | apply_filters( 'update_feedback', __( 'Verifying the unpacked files…' ) ); |
| 761 | |
| 762 | // Sanity check the unzipped distribution. |
| 763 | $distro = ''; |
| 764 | $roots = array( '/wordpress/', '/wordpress-mu/' ); |
| 765 | foreach ( $roots as $root ) { |
| 766 | if ( $wp_filesystem->exists( $from . $root . 'readme.html' ) && $wp_filesystem->exists( $from . $root . 'wp-includes/version.php' ) ) { |
| 767 | $distro = $root; |
| 768 | break; |
| 769 | } |
| Line | Code |
| 800 | |
| 801 | if ( !$mysql_compat && !$php_compat ) |
| 802 | return new WP_Error( 'php_mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$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, $mysql_version ) ); |
| 803 | elseif ( !$php_compat ) |
| 804 | 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, $php_version ) ); |
| 805 | elseif ( !$mysql_compat ) |
| 806 | 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 ) ); |
| 807 | |
| 808 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 809 | apply_filters( 'update_feedback', __( 'Preparing to install the latest version…' ) ); |
| 810 | |
| 811 | // Don't copy wp-content, we'll deal with that below |
| 812 | // We also copy version.php last so failed updates report their old version |
| 813 | $skip = array( 'wp-content', 'wp-includes/version.php' ); |
| 814 | $check_is_writable = array(); |
| 815 | |
| 816 | // Check to see which files don't really need updating - only available for 3.7 and higher |
| 817 | if ( function_exists( 'get_core_checksums' ) ) { |
| 818 | // Find the local version of the working directory |
| Line | Code |
| 852 | // Store package-relative paths (the key) of non-writable files in the WP_Error object. |
| 853 | $error_data = version_compare( $old_wp_version, '3.7-beta2', '>' ) ? array_keys( $files_not_writable ) : ''; |
| 854 | |
| 855 | if ( $files_not_writable ) |
| 856 | 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 ) ); |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 861 | apply_filters( 'update_feedback', __( 'Enabling Maintenance mode…' ) ); |
| 862 | // Create maintenance file to signal that we are upgrading |
| 863 | $maintenance_string = '<?php $upgrading = ' . time() . '; ?>'; |
| 864 | $maintenance_file = $to . '.maintenance'; |
| 865 | $wp_filesystem->delete($maintenance_file); |
| 866 | $wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE); |
| 867 | |
| 868 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 869 | apply_filters( 'update_feedback', __( 'Copying the required files…' ) ); |
| 870 | // Copy new versions of WP files into place. |
| 871 | $result = _copy_dir( $from . $distro, $to, $skip ); |
| 872 | if ( is_wp_error( $result ) ) |
| 873 | $result = new WP_Error( $result->get_error_code(), $result->get_error_message(), substr( $result->get_error_data(), strlen( $to ) ) ); |
| 874 | |
| 875 | // Since we know the core files have copied over, we can now copy the version file |
| 876 | if ( ! is_wp_error( $result ) ) { |
| 877 | if ( ! $wp_filesystem->copy( $from . $distro . 'wp-includes/version.php', $to . 'wp-includes/version.php', true /* overwrite */ ) ) { |
| 878 | $wp_filesystem->delete( $from, true ); |
| Line | Code |
| 935 | if ( $wp_lang_dir ) { |
| 936 | $result = copy_dir($from . $distro . 'wp-content/languages/', $wp_lang_dir); |
| 937 | if ( is_wp_error( $result ) ) |
| 938 | $result = new WP_Error( $result->get_error_code() . '_languages', $result->get_error_message(), substr( $result->get_error_data(), strlen( $wp_lang_dir ) ) ); |
| 939 | } |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 944 | apply_filters( 'update_feedback', __( 'Disabling Maintenance mode…' ) ); |
| 945 | // Remove maintenance file, we're done with potential site-breaking changes |
| 946 | $wp_filesystem->delete( $maintenance_file ); |
| 947 | |
| 948 | // 3.5 -> 3.5+ - an empty twentytwelve directory was created upon upgrade to 3.5 for some users, preventing installation of Twenty Twelve. |
| 949 | if ( '3.5' == $old_wp_version ) { |
| 950 | if ( is_dir( WP_CONTENT_DIR . '/themes/twentytwelve' ) && ! file_exists( WP_CONTENT_DIR . '/themes/twentytwelve/style.css' ) ) { |
| 951 | $wp_filesystem->delete( $wp_filesystem->wp_themes_dir() . 'twentytwelve/' ); |
| 952 | } |
| 953 | } |
| Line | Code |
| 1007 | foreach ( $_old_files as $old_file ) { |
| 1008 | $old_file = $to . $old_file; |
| 1009 | if ( !$wp_filesystem->exists($old_file) ) |
| 1010 | continue; |
| 1011 | $wp_filesystem->delete($old_file, true); |
| 1012 | } |
| 1013 | |
| 1014 | // Upgrade DB with separate request |
| 1015 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 1016 | apply_filters( 'update_feedback', __( 'Upgrading database…' ) ); |
| 1017 | $db_upgrade_url = admin_url('upgrade.php?step=upgrade_db'); |
| 1018 | wp_remote_post($db_upgrade_url, array('timeout' => 60)); |
| 1019 | |
| 1020 | // Clear the cache to prevent an update_option() from saving a stale db_version to the cache |
| 1021 | wp_cache_flush(); |
| 1022 | // (Not all cache backends listen to 'flush') |
| 1023 | wp_cache_delete( 'alloptions', 'options' ); |
| 1024 | |
| 1025 | // Remove working directory |