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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 3 times in this file.
| Line | Code |
|---|---|
| 489 | |
| 490 | if ( !$mysql_compat && !$php_compat ) |
| 491 | 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, $mysql_version ) ); |
| 492 | elseif ( !$php_compat ) |
| 493 | 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, $php_version ) ); |
| 494 | elseif ( !$mysql_compat ) |
| 495 | 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 ) ); |
| 496 | |
| 497 | // Sanity check the unzipped distribution |
| 498 | apply_filters('update_feedback', __('Verifying the unpacked files…')); |
| 499 | $distro = ''; |
| 500 | $roots = array( '/wordpress/', '/wordpress-mu/' ); |
| 501 | foreach( $roots as $root ) { |
| 502 | if ( $wp_filesystem->exists($from . $root . 'readme.html') && $wp_filesystem->exists($from . $root . 'wp-includes/version.php') ) { |
| 503 | $distro = $root; |
| 504 | break; |
| 505 | } |
| 506 | } |
| 507 | if ( !$distro ) { |
| 508 | $wp_filesystem->delete($from, true); |
| 509 | return new WP_Error('insane_distro', __('The update could not be unpacked') ); |
| 510 | } |
| 511 | |
| 512 | apply_filters('update_feedback', __('Installing the latest version…')); |
| 513 | |
| 514 | // Create maintenance file to signal that we are upgrading |
| 515 | $maintenance_string = '<?php $upgrading = ' . time() . '; ?>'; |
| 516 | $maintenance_file = $to . '.maintenance'; |
| 517 | $wp_filesystem->delete($maintenance_file); |
| 518 | $wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE); |
| 519 | |
| 520 | // Copy new versions of WP files into place. |
| 521 | $result = _copy_dir($from . $distro, $to, array('wp-content') ); |
| Line | Code |
| 586 | // Remove old files |
| 587 | foreach ( $_old_files as $old_file ) { |
| 588 | $old_file = $to . $old_file; |
| 589 | if ( !$wp_filesystem->exists($old_file) ) |
| 590 | continue; |
| 591 | $wp_filesystem->delete($old_file, true); |
| 592 | } |
| 593 | |
| 594 | // Upgrade DB with separate request |
| 595 | apply_filters('update_feedback', __('Upgrading database…')); |
| 596 | $db_upgrade_url = admin_url('upgrade.php?step=upgrade_db'); |
| 597 | wp_remote_post($db_upgrade_url, array('timeout' => 60)); |
| 598 | |
| 599 | // Remove working directory |
| 600 | $wp_filesystem->delete($from, true); |
| 601 | |
| 602 | // Force refresh of update information |
| 603 | if ( function_exists('delete_site_transient') ) |
| 604 | delete_site_transient('update_core'); |