素のPHPでログを出したいとき

debugLog.php

<?php
function debugLog($label, $val) {
	static $filename = 'logs/debug.log';

	$mtime = microtime();
	$timeStmp = explode(' ', $mtime);
	$time  = date('Y-m-d H:i:s', (int)$timeStmp[1]);
	$mtime = number_format($mtime,5);

	$val = var_export($val, true);
	$val = str_replace('"', '""', $val);

	$message = '"'. $time. '","'. $mtime. '","'. $label. '"'."\r\n". $val. '"'. "\r\n";

	error_log($message, 3, $filename);
}