log js errors on server side

jslogger

js: place in the head of html

<script type="text/javascript">
window.onerror = function (errorMsg, url, lineNumber, column, errorObj) {
		if (errorMsg.indexOf('Script error.') > -1) {
			return;
		}
		var text = 'Err: ' + errorMsg + ' | Script: ' + url + ' | Ln: ' + lineNumber	+ (column ? ' | Clmn: ' + column : '') + (errorObj ? ' | Stacktrc: ' +  errorObj : '');
		var r = new XMLHttpRequest();
		var params = "d=" + encodeURIComponent(text);
		r.open("POST", "jslogger.php", true);
		r.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		r.setRequestHeader("Content-length", params.length);
		r.setRequestHeader("Connection", "close");
		r.send(params);
	}
</script>
	
--------------------
jslogger.php:
	
<?php
  if($d = addslashes(strip_tags(trim($_POST['d'])))){
    file_put_contents('jserror.log',date('y-m-d H:i : ').$d.' | UA: '.$_SERVER['HTTP_USER_AGENT']."\n",FILE_APPEND);
  }
?>