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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 |
|---|---|
| 418 | |
| 419 | if ( !$mysql_compat && !$php_compat ) |
| 420 | 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, $mysql_version ) ); |
| 421 | elseif ( !$php_compat ) |
| 422 | 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, $php_version ) ); |
| 423 | elseif ( !$mysql_compat ) |
| 424 | 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 ) ); |
| 425 | |
| 426 | // Sanity check the unzipped distribution |
| 427 | apply_filters('update_feedback', __('Verifying the unpacked files…')); |
| 428 | $distro = ''; |
| 429 | $roots = array( '/wordpress/', '/wordpress-mu/' ); |
| 430 | foreach( $roots as $root ) { |
| 431 | if ( $wp_filesystem->exists($from . $root . 'readme.html') && $wp_filesystem->exists($from . $root . 'wp-includes/version.php') ) { |
| 432 | $distro = $root; |
| 433 | break; |
| 434 | } |
| 435 | } |
| 436 | if ( !$distro ) { |
| 437 | $wp_filesystem->delete($from, true); |
| 438 | return new WP_Error('insane_distro', __('The update could not be unpacked') ); |
| 439 | } |
| 440 | |
| 441 | apply_filters('update_feedback', __('Installing the latest version…')); |
| 442 | |
| 443 | // Create maintenance file to signal that we are upgrading |
| 444 | $maintenance_string = '<?php $upgrading = ' . time() . '; ?>'; |
| 445 | $maintenance_file = $to . '.maintenance'; |
| 446 | $wp_filesystem->delete($maintenance_file); |
| 447 | $wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE); |
| 448 | |
| 449 | // Copy new versions of WP files into place. |
| 450 | $result = _copy_dir($from . $distro, $to, array('wp-content') ); |
| Line | Code |
| 515 | // Remove old files |
| 516 | foreach ( $_old_files as $old_file ) { |
| 517 | $old_file = $to . $old_file; |
| 518 | if ( !$wp_filesystem->exists($old_file) ) |
| 519 | continue; |
| 520 | $wp_filesystem->delete($old_file, true); |
| 521 | } |
| 522 | |
| 523 | // Upgrade DB with separate request |
| 524 | apply_filters('update_feedback', __('Upgrading database…')); |
| 525 | $db_upgrade_url = admin_url('upgrade.php?step=upgrade_db'); |
| 526 | wp_remote_post($db_upgrade_url, array('timeout' => 60)); |
| 527 | |
| 528 | // Remove working directory |
| 529 | $wp_filesystem->delete($from, true); |
| 530 | |
| 531 | // Force refresh of update information |
| 532 | if ( function_exists('delete_site_transient') ) |
| 533 | delete_site_transient('update_core'); |