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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 $url;
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "HTTP_USER_AGENT" in /in/YuLpJ on line 2 Deprecated: preg_match(): Passing null to parameter #2 ($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
Output for 8.0.0 - 8.0.30
Warning: Undefined array key "HTTP_USER_AGENT" in /in/YuLpJ on line 2 Warning: Undefined array key "HTTP_USER_AGENT" in /in/YuLpJ on line 3 not detected
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
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
Output for 7.3.32 - 7.3.33
not detected
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262.18 ms | 401 KiB | 407 Q