Issue

I am checking for url & return "valid" if url status code "200" & "invalid" if its on "404",

urls are links which redirect to a certain page (url) & i need to check that page (url) status to determine if its valid or invalid on the basis of its status code.

<?php

// From URL to get redirected URL
$url = 'https://www.shareasale.com/m-pr.cfm?merchantID=83483&userID=1860618&productID=916465625';
  
// Initialize a CURL session.
$ch = curl_init();
  
// Grab URL and pass it to the variable.
curl_setopt($ch, CURLOPT_URL, $url);
  
// Catch output (do NOT print!)
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
  
// Return follow location true
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
$html = curl_exec($ch);
  
// Getinfo or redirected URL from effective URL
$redirectedUrl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
  
// Close handle
curl_close($ch);
echo "Original URL:   " . $url . "<br/> </br>";
echo "Redirected URL: " . $redirectedUrl . "<br/>";

 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);
 
  if ($httpCode == 200) {
    return 'valid link';
  }
  else {
    return 'invalid link';
  }
}

// 
echo "<br/>".is_url_valid($redirectedUrl)."<br/>";

As you can see the above link has status 400 still it shows "valid" I am using above code, any thoughts or correction's ? in order to make it work as expected ? It seems like the site has more then one redirected url & script checks for only one that's why it shows valid. any thoughts how to fix it ?

Here are the links which i am checking with

ISSUE -

FOR EXAMPLE - If i check with this link https://www.shareasale.com/m-pr.cfm?merchantID=66802&userID=1860618&productID=1186005518 then in browser it goes on "404" but in script o/p its "200"

Solution

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]);
            }
        }
    }

Answered By - user15233374

Monday, November 1, 2021

[SOLVED] PHP - Check if url is valid or not

Issue

Solution