图像URL错误捕获问题

Question

I am trying to see if a URL exists or not, and if it does not exist reset the variable containing the URL to an error page/image. However my attempt below sets every instance of PIC_URL to noimage.gif, regardless of if it exists and is accessible or not. What am I missing?

if (@fopen($_REQUEST[$PIC_URL],"r")) 
{
$status = "1";
} 
else  if (!(@fopen($_REQUEST[$PIC_URL],"r"))
{

$status = "2"; 
}

if ( $status == "2" ) $PIC_URL = "http://www.tricityhomes.com/assets/images/noimage.gif";

Answer 1

The test on the else part looks redundant, and did you mean $_REQUEST['PIC_URL']?

if (@fopen($_REQUEST['PIC_URL'],"r")) 
{
    $status = "1";
} 
else
{

    $status = "2"; 
}

There's plenty more wrong with it though. To test if a remote file exists, you'd be better off using file_exists, or even rolling your own method to perform a HEAD request.