_wp_delete_all_temp_backups()

1107function _wp_delete_all_temp_backups() {1108	global $wp_filesystem;1109 1110	if ( ! function_exists( 'WP_Filesystem' ) ) {1111		require_once ABSPATH . '/wp-admin/includes/file.php';1112	}1113 1114	ob_start();1115	$credentials = request_filesystem_credentials( '' );1116	ob_end_clean();1117 1118	if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {1119		wp_trigger_error( __FUNCTION__, __( 'Could not access filesystem.' ) );1120		return;1121	}1122 1123	if ( ! $wp_filesystem->wp_content_dir() ) {1124		wp_trigger_error(1125			__FUNCTION__,1126			/* translators: %s: Directory name. */1127			sprintf( __( 'Unable to locate WordPress content directory (%s).' ), 'wp-content' )1128		);1129		return;1130	}1131 1132	$temp_backup_dir = $wp_filesystem->wp_content_dir() . 'upgrade-temp-backup/';1133	$dirlist         = $wp_filesystem->dirlist( $temp_backup_dir );1134	$dirlist         = $dirlist ? $dirlist : array();1135 1136	foreach ( array_keys( $dirlist ) as $dir ) {1137		if ( '.' === $dir || '..' === $dir ) {1138			continue;1139		}1140 1141		$wp_filesystem->delete( $temp_backup_dir . $dir, true );1142	}1143}