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PHP Detect All Versions of IE

Quick code snippet for detecting all versions of good ’ol IE (Internet Explorer).

Using PHP’s preg_match(), it is possible to match all versions of IE. Consider the following example:

$ua = htmlentities($_SERVER['HTTP_USER_AGENT'], ENT_QUOTES, 'UTF-8');
if (preg_match('~MSIE|Internet Explorer~i', $ua) || (strpos($ua, 'Trident/7.0; rv:11.0') !== false)) {
	// do stuff for IE

Here we are sanitizing the user agent and storing it as a variable named $ua. We then use preg_match() to pattern-match for IE 10 and below (first “or” condition) and also IE 11 (second “or” condition). Cumulatively this accounts for all currently existing versions of Internet Explorer.

Remember to update this technique with the advent of future versions of IE!

★ Pro Tip: