How to Test a Url For 404 in PHP

Easy way to test a URL for 404 in PHP?

If you are using PHP's curl bindings, you can check the error code using curl_getinfo as such:

$handle = curl_init($url);
curl_setopt($handle,  CURLOPT_RETURNTRANSFER, TRUE);

/* Get the HTML or whatever is linked in $url. */
$response = curl_exec($handle);

/* Check for 404 (file not found). */
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
if($httpCode == 404) {
    /* Handle 404 here. */
}

curl_close($handle);

/* Handle $response here. */

how to check if a URL exists or not - error 404 ? (using php)

If you have allow_url_fopen, you can do:

$exists = ($fp = fopen("http://www.faressoft.org/", "r")) !== FALSE;
if ($fp) fclose($fp);

although strictly speaking, this won't return false only for 404 errors. It's possible to use stream contexts to get that information, but a better option is to use the curl extension:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.example.com/notfound");
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_exec($ch);
$is404 = curl_getinfo($ch, CURLINFO_HTTP_CODE) == 404;
curl_close($ch);

PHP - Check if url is valid or not

The below code works well but when i put urls in array & test the same functionality then it does not give proper results ?
Any thoughts why ?
Also if any body would like to update answer to make it dynamic in the sense (should check multiple url at once, when an array of url provided).

  <?php
    
    // URL to check
    $url = 'https://www.shareasale.com/m-pr.cfm?merchantID=66802&userID=1860618&productID=1186005518';
      
    $ch = curl_init(); // Initialize a CURL session.
    curl_setopt($ch, CURLOPT_URL, $url); // Grab URL and pass it to the variable.
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); // Catch output (do NOT print!)
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE); // Return follow location true
    $html = curl_exec($ch);
    $redirectedUrl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL); // Getinfo or redirected URL from effective URL
    curl_close($ch); // Close handle
    
    $get_final_url = get_final_url($redirectedUrl);
    if($get_final_url){
        echo is_url_valid($get_final_url);
    }else{
        echo $redirectedUrl ? is_url_valid($redirectedUrl) : is_url_valid($url);
    }
    
    function is_url_valid($url) {
      $handle = curl_init($url);
      curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
      curl_setopt($handle, CURLOPT_NOBODY, true);
      curl_exec($handle);
     
      $httpCode = intval(curl_getinfo($handle, CURLINFO_HTTP_CODE));
      curl_close($handle);
      echo $httpCode;
      if ($httpCode == 200) {
        return '<b> Valid link </b>';
      }
      else {
        return '<b> Invalid link </b>';
      }
    }
    
    function get_final_url($url) {
            $ch = curl_init();
            if (!$ch) {
                return false;
            }
            $ret = curl_setopt($ch, CURLOPT_URL,            $url);
            $ret = curl_setopt($ch, CURLOPT_HEADER,         1);
            $ret = curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
            $ret = curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            $ret = curl_setopt($ch, CURLOPT_TIMEOUT,        30);
            $ret = curl_exec($ch);
    
            if (!empty($ret)) {
                $info = curl_getinfo($ch);
                curl_close($ch);
                return false;
            if (empty($info['http_code'])) {
                return false;
            } else {
                preg_match('#(https:.*?)\'\)#', $ret, $match);
                $final_url = stripslashes($match[1]);
                return stripslashes($match[1]);
            }
        }
    } 

How to detect PHP script is being used as ErrorDocument for 404 Not Found?

One way to do this would be simply look at the $_SERVER['REQUEST_URI'] and determine if it points at something invalid.

While your example is probably simplified for this question, it might be as simple as

if ($_SERVER['REQUEST_URI'] != 'test.php') {
    //we are handling a 404
    header("HTTP/1.0 404 Not Found");
    echo "These aren't the droids you're looking for";
}

You may need more complex logic, but will all boil down to looking at the request and detecting it was invalid.

As long as the ErrorDocument is a relative URL (doesn't start with http://...), then you should find your script has some extra $_SERVER variables, e.g.

$_SERVER["REDIRECT_URL"]; // /original/path
$_SERVER['REDIRECT_STATUS']; // 404

See the ErrorDocument documentation for more details.

Alternatively, just pass a query string arg to the 404 handler, e.g. ErrorDocument 404 /test.php?error=404 :)

How to create an error 404 page using PHP?

The up-to-date answer (as of PHP 5.4 or newer) for generating 404 pages is to use http_response_code:

<?php
http_response_code(404);
include('my_404.php'); // provide your own HTML for the error page
die();

die() is not strictly necessary, but it makes sure that you don't continue the normal execution.

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