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<?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 $url;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "HTTP_USER_AGENT" in /in/YuLpJ on line 2 Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /in/YuLpJ on line 2 Warning: Undefined array key "HTTP_USER_AGENT" in /in/YuLpJ on line 3 Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /in/YuLpJ on line 3 not detected

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