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<?php preg_match('/robot|spider|crawler|curl|^$/i', $_SERVER['HTTP_USER_AGENT']);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "HTTP_USER_AGENT" in /in/XTcC2 on line 3 Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /in/XTcC2 on line 3

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