PHP 404 judgment and js 404 judgment

PHP 404 judgment and js 404 judgment

php judgment 404:

$url = home_url()."/wp-content/themes/twentythirteen/pic/".$result['pic'];
	$headers = @get_headers($url);
	if(strpos($headers[0],'404') )
	{
	$url=home_url()."/wp-content/themes/twentythirteen/pic/default.png";
	}

js judgment 404:

var pic_url ="/wp-content/themes/twentythirteen/pic/"+data[i].pic;
			$.ajax({
				url:pic_url,
				error:function(xhr, error, ex){
					if (xhr.status == '404') {
	pic_url = "/wp-content/themes/twentythirteen/pic/default.png";
					}
				},
				success:function(){
					pic_url = pic_url;
				}
			});

js judgment 404, through ajax...

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