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Editorial Team
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Asked: 2026-05-25T16:24:26+00:00

I have a form that when a url is placed in the form and

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I have a form that when a url is placed in the form and the button is clicked the URL is process and based on the pregmatch it extracts a URL. When a match is found for one of them the others return an error Notice: Undefined offset: 1 how can i make it so that if a match is found for one the others are not giving an error?

if ( !isset( $_GET['go'] ) ) return;
$userLink =  $_GET['go'] ;
if ( !$userLink ) return;

$data = file_get_contents($userLink);
preg_match("@^(?:\s)*var url = '(.*)';@mi",$data, $parsed1);
preg_match("@^(?:\s)*self.location = '(.*)';@mi",$data, $parsed2);
preg_match("@^(?:\s)*window.location = \"(.*)\";@mi",$data, $parsed3);
preg_match("@^(?:\s)*Lbjs.TargetUrl = '(.*)';@mi",$data, $parsed4);
preg_match("@^(?:\s)*linkDestUrl = '(.*)';@mi",$data, $parsed5);

echo 'var.url - ' . $parsed1[1] . '<br>';
echo 'self.location - ' . $parsed2[1] . '<br>';
echo 'window.location - ' . $parsed3[1] . '<br>';
echo 'Lbjs.TargetUrl - ' . $parsed4[1] . '<br>';
echo 'linkDestUrl - ' . $parsed5[1];
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1 Answer

  1. Editorial Team

    I’m presuming only one of the URL types is going to match, not two or more?

    if ( !isset( $_GET['go'] ) ) return;
$userLink =  $_GET['go'] ;
if ( !$userLink ) return;

$data = file_get_contents($userLink);

$array = array(

  'var url',
  'self.location',
  'window.location',
  'Lbjs.TargetUrl',
  'linkDestUrl',

);

foreach ($array as $value)
{

  if (preg_match("@^(?:\s)*($value) = '(.*)';@mi",$data, $parsed))
  {
    break;
  }

}

echo $parsed[1] . ' - ' . $parsed[2] . '<br>';
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