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<?php if(preg_match('/MSIE (.*?);/', $_SERVER['HTTP_USER_AGENT']) || // This regex fails to detect IE 11 preg_match('/^(?=.*(Trident))(?=.*(rv:11.0)).*$/', $_SERVER['HTTP_USER_AGENT'])) { echo 'true'; } else { echo 'false'; }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "HTTP_USER_AGENT" in /in/lvHQN on line 2 Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /in/lvHQN on line 2 Warning: Undefined array key "HTTP_USER_AGENT" in /in/lvHQN on line 3 Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /in/lvHQN on line 3 false
Output for 8.0.0 - 8.0.30
Warning: Undefined array key "HTTP_USER_AGENT" in /in/lvHQN on line 2 Warning: Undefined array key "HTTP_USER_AGENT" in /in/lvHQN on line 3 false
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/lvHQN on line 2 Notice: Undefined index: HTTP_USER_AGENT in /in/lvHQN on line 3 false
Output for 7.3.32 - 7.3.33
false
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Notice: Undefined index: HTTP_USER_AGENT in /in/lvHQN on line 2 Notice: Undefined index: HTTP_USER_AGENT in /in/lvHQN on line 3 false
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