php不为人知的函数register_shutdown_function的用法

void register_shutdown_function ( callback $function [, mixed $parameter [, mixed $... ]] )

 
register_shutdown_function ('page_log');
 
function hd_write_log ($str,$type='perf') {
	$dirname = ROOT_PATH.'/logs/'.date('Ym');
	if (!is_dir ($dirname))	{
		@mkdir ($dirname ,0777);
	}
	$filename = $dirname.'/'.date ('Ymd').'_'.$type.'.log';
	$handle = fopen ($filename ,'a+') ;
	if ($handle) {
		fwrite ($handle ,$str."\r\n");
		fclose ($handle);
	}
 
}