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run code in 200+ php & hhvm versions
Bugs & Features
<?php if(preg_match('/MSIE (.*?);/', $_SERVER['HTTP_USER_AGENT']) || // This regex fails to detect IE 11 preg_match('/^(?=.*(Trident))(?=.*(rv:11.0)).*$/', $_SERVER['HTTP_USER_AGENT'])) // This regex recognizes IE 11 by matching the keywords "Trident" and "rv:11.0" { $url = 'IE detected'; } else { $url = 'not detected'; } echo $url;
Output for 5.3.7 - 7.2.0
Notice: Undefined index: HTTP_USER_AGENT in /in/YuLpJ on line 2 Notice: Undefined index: HTTP_USER_AGENT in /in/YuLpJ on line 3 not detected