Discuz!运行日志记录函数runlog详解

在discuz!的datalog目录下，我们会看到很多格式如YYYYMM_XX.php的文件(如下图所示)，打开文件我们就会看到很多操作日志，这些日志怎么生成的呢，今天我们就来看看Discuz!运行日志记录runlog函数

runlog函数定义文件 sourcefunctionfunction_core.php

function runlog($file, $message, $halt=0) {
	helper_log::runlog($file, $message, $halt);
}

我们看到这个函数是调用的helper_log小助手，helper_log定义于：sourceclasshelperhelper_log.php

相关方法如下

public static function runlog($file, $message, $halt=0) {
	global $_G;
	$nowurl = $_SERVER["REQUEST_URI"]?$_SERVER["REQUEST_URI"]:($_SERVER["PHP_SELF"]?$_SERVER["PHP_SELF"]:$_SERVER["SCRIPT_NAME"]);
	$log = dgmdate($_G["timestamp"], "Y-m-d H:i:s")."	".$_G["clientip"]."	$_G[uid]	{$nowurl}	".str_replace(array("
", "
"), array(" ", " "), trim($message))."
";
	helper_log::writelog($file, $log);//写入文件
	if($halt) {
		exit();
	}
}

public static function writelog($file, $log) {
	global $_G;
	$yearmonth = dgmdate(TIMESTAMP, "Ym", $_G["setting"]["timeoffset"]);
	$logdir = DISCUZ_ROOT."./data/log/";
	$logfile = $logdir.$yearmonth."_".$file.".php";//日志文件
	if(@filesize($logfile) > 2048000) {
		$dir = opendir($logdir);
		$length = strlen($file);
		$maxid = $id = 0;
		while($entry = readdir($dir)) {
			if(strpos($entry, $yearmonth."_".$file) !== false) {
				$id = intval(substr($entry, $length + 8, -4));
				$id > $maxid && $maxid = $id;
			}
		}
		closedir($dir);


		$logfilebak = $logdir.$yearmonth."_".$file."_".($maxid + 1).".php";
		@rename($logfile, $logfilebak);
	}
	if($fp = @fopen($logfile, "a")) {
		@flock($fp, 2);
		if(!is_array($log)) {
			$log = array($log);
		}
		foreach($log as $tmp) {
			fwrite($fp, "<?PHP exit;?>	".str_replace(array("<?", "?>"), "", $tmp)."
");
		}
		fclose($fp);
	}
}

我看可以看到运行日志按月存储在各个分类（日志的分类大致有"illegal", "rate", "credit", "mods", "medal", "ban", "cp", "magic", "error", "invite", "payment", "warn", "crime", "sendmail"几种）的文件下，每条记录的不同字段以制表符 分隔；