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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 |
|---|---|
| 229 | |
| 230 | if ( !$mysql_compat && !$php_compat ) |
| 231 | 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, $mysql_version ) ); |
| 232 | elseif ( !$php_compat ) |
| 233 | 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, $php_version ) ); |
| 234 | elseif ( !$mysql_compat ) |
| 235 | 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, $mysql_version ) ); |
| 236 | |
| 237 | // Sanity check the unzipped distribution |
| 238 | apply_filters('update_feedback', __('Verifying the unpacked files')); |
| 239 | if ( !$wp_filesystem->exists($from . '/wordpress/wp-settings.php') || !$wp_filesystem->exists($from . '/wordpress/wp-admin/admin.php') || |
| 240 | !$wp_filesystem->exists($from . '/wordpress/wp-includes/functions.php') ) { |
| 241 | $wp_filesystem->delete($from, true); |
| 242 | return new WP_Error('insane_distro', __('The update could not be unpacked') ); |
| 243 | } |
| 244 | |
| 245 | apply_filters('update_feedback', __('Installing the latest version')); |
| 246 | |
| 247 | // Create maintenance file to signal that we are upgrading |
| 248 | $maintenance_string = '<?php $upgrading = ' . time() . '; ?>'; |
| 249 | $maintenance_file = $to . '.maintenance'; |
| 250 | $wp_filesystem->delete($maintenance_file); |
| 251 | $wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE); |
| 252 | |
| 253 | // Copy new versions of WP files into place. |
| 254 | $result = copy_dir($from . '/wordpress', $to); |
| Line | Code |
| 261 | // Remove old files |
| 262 | foreach ( $_old_files as $old_file ) { |
| 263 | $old_file = $to . $old_file; |
| 264 | if ( !$wp_filesystem->exists($old_file) ) |
| 265 | continue; |
| 266 | $wp_filesystem->delete($old_file, true); |
| 267 | } |
| 268 | |
| 269 | // Upgrade DB with separate request |
| 270 | apply_filters('update_feedback', __('Upgrading database')); |
| 271 | $db_upgrade_url = admin_url('upgrade.php?step=upgrade_db'); |
| 272 | wp_remote_post($db_upgrade_url, array('timeout' => 60)); |
| 273 | |
| 274 | // Remove working directory |
| 275 | $wp_filesystem->delete($from, true); |
| 276 | |
| 277 | // Force refresh of update information |
| 278 | if ( function_exists('delete_transient') ) |
| 279 | delete_transient('update_core'); |