<?php
 
$data = <<<DATA
<meta http-equiv='refresh' content='0; URL=/game/index.php?page=overview&session=9efae87dd67&lgn=1'>
<body/>
DATA;
 
$previous_value = libxml_use_internal_errors(TRUE);
 
$dom = new DOMDocument();
$dom->loadHTML($data);
 
$xpath = new DOMXPath($dom);
 
$meta = $xpath->query("//meta")->item(0);
 
$regex = '~session=\K[^&]+~';
preg_match($regex, $meta->getAttribute("content"), $session);
echo $session[0];
 
libxml_clear_errors();
libxml_use_internal_errors($previous_value);
 
?>

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