Question

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Easy way to test a URL for 404 in PHP?

I am using curl to download a sequence of pdfs from the backend in PHP. I do not know when the sequence ends like 1.pdf, 2.pdf……etc.

Below is the code I am using to download pdf:

$url  = 'http://<ip>.pdf';
    $path = "C:\\test.pdf";
 
    $fp = fopen($path, 'w');
 
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_FILE, $fp);
 
    $data = curl_exec($ch);
    
    fclose($fp);

But how do I determine that that pdf do not exists in the backend? Does curl returns any response when file not found?

Answer 1

$ch=curl_init("www.example.org/example.pdf");
curl_setopt($ch,CURLOPT_HEADER,0);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$result=curl_exec($ch);
curl_close($ch);

with curl_setopt($ch,CURLOPT_RETURNTRANSFER,true); it will return the result on success, FALSE on failure.

with curl_setopt($ch,CURLOPT_RETURNTRANSFER,false); it will return TRUE on success or FALSE on failure.

Moreover, for file not found:

$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if($http_code == 404)
{
  /*file not found*/
}