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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 |
|---|---|
| 1058 | * 2. Before Maintenance Mode is enabled. |
| 1059 | * 3. Before WordPress begins copying over the necessary files. |
| 1060 | * 4. Before Maintenance Mode is disabled. |
| 1061 | * 5. Before the database is upgraded. |
| 1062 | * |
| 1063 | * @since 2.5.0 |
| 1064 | * |
| 1065 | * @param string $feedback The core update feedback messages. |
| 1066 | */ |
| 1067 | apply_filters( 'update_feedback', __( 'Verifying the unpacked files…' ) ); |
| 1068 | |
| 1069 | // Confidence check the unzipped distribution. |
| 1070 | $distro = ''; |
| 1071 | $roots = array( '/wordpress/', '/wordpress-mu/' ); |
| 1072 | |
| 1073 | foreach ( $roots as $root ) { |
| 1074 | if ( $wp_filesystem->exists( $from . $root . 'readme.html' ) |
| 1075 | && $wp_filesystem->exists( $from . $root . 'wp-includes/version.php' ) |
| 1076 | ) { |
| Line | Code |
| 1212 | } |
| 1213 | |
| 1214 | // Add a warning when required PHP extensions are missing. |
| 1215 | if ( ! empty( $missing_extensions->errors ) ) { |
| 1216 | return $missing_extensions; |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 1221 | apply_filters( 'update_feedback', __( 'Preparing to install the latest version…' ) ); |
| 1222 | |
| 1223 | /* |
| 1224 | * Don't copy wp-content, we'll deal with that below. |
| 1225 | * We also copy version.php last so failed updates report their old version. |
| 1226 | */ |
| 1227 | $skip = array( 'wp-content', 'wp-includes/version.php' ); |
| 1228 | $check_is_writable = array(); |
| 1229 | |
| 1230 | // Check to see which files don't really need updating - only available for 3.7 and higher. |
| Line | Code |
| 1296 | 'files_not_writable', |
| 1297 | __( 'The update cannot be installed because your site is unable to copy some files. This is usually due to inconsistent file permissions.' ), |
| 1298 | implode( ', ', $error_data ) |
| 1299 | ); |
| 1300 | } |
| 1301 | } |
| 1302 | } |
| 1303 | |
| 1304 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 1305 | apply_filters( 'update_feedback', __( 'Enabling Maintenance mode…' ) ); |
| 1306 | |
| 1307 | // Create maintenance file to signal that we are upgrading. |
| 1308 | $maintenance_string = '<?php $upgrading = ' . time() . '; ?>'; |
| 1309 | $maintenance_file = $to . '.maintenance'; |
| 1310 | $wp_filesystem->delete( $maintenance_file ); |
| 1311 | $wp_filesystem->put_contents( $maintenance_file, $maintenance_string, FS_CHMOD_FILE ); |
| 1312 | |
| 1313 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 1314 | apply_filters( 'update_feedback', __( 'Copying the required files…' ) ); |
| 1315 | |
| 1316 | // Copy new versions of WP files into place. |
| 1317 | $result = copy_dir( $from . $distro, $to, $skip ); |
| 1318 | |
| 1319 | if ( is_wp_error( $result ) ) { |
| 1320 | $result = new WP_Error( |
| 1321 | $result->get_error_code(), |
| 1322 | $result->get_error_message(), |
| 1323 | substr( $result->get_error_data(), strlen( $to ) ) |
| Line | Code |
| 1445 | $result->get_error_message(), |
| 1446 | substr( $result->get_error_data(), strlen( $wp_lang_dir ) ) |
| 1447 | ); |
| 1448 | } |
| 1449 | } |
| 1450 | } |
| 1451 | } |
| 1452 | |
| 1453 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 1454 | apply_filters( 'update_feedback', __( 'Disabling Maintenance mode…' ) ); |
| 1455 | |
| 1456 | // Remove maintenance file, we're done with potential site-breaking changes. |
| 1457 | $wp_filesystem->delete( $maintenance_file ); |
| 1458 | |
| 1459 | /* |
| 1460 | * 3.5 -> 3.5+ - an empty twentytwelve directory was created upon upgrade to 3.5 for some users, |
| 1461 | * preventing installation of Twenty Twelve. |
| 1462 | */ |
| 1463 | if ( '3.5' === $old_wp_version ) { |
| Line | Code |
| 1560 | |
| 1561 | // Deactivate the REST API plugin if its version is 2.0 Beta 4 or lower. |
| 1562 | _upgrade_440_force_deactivate_incompatible_plugins(); |
| 1563 | |
| 1564 | // Deactivate incompatible plugins. |
| 1565 | _upgrade_core_deactivate_incompatible_plugins(); |
| 1566 | |
| 1567 | // Upgrade DB with separate request. |
| 1568 | /** This filter is documented in wp-admin/includes/update-core.php */ |
| 1569 | apply_filters( 'update_feedback', __( 'Upgrading database…' ) ); |
| 1570 | |
| 1571 | $db_upgrade_url = admin_url( 'upgrade.php?step=upgrade_db' ); |
| 1572 | wp_remote_post( $db_upgrade_url, array( 'timeout' => 60 ) ); |
| 1573 | |
| 1574 | // Clear the cache to prevent an update_option() from saving a stale db_version to the cache. |
| 1575 | wp_cache_flush(); |
| 1576 | // Not all cache back ends listen to 'flush'. |
| 1577 | wp_cache_delete( 'alloptions', 'options' ); |
| 1578 | |