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<?php $header = array('test'); if (key_exists('class', $header[0])) { echo 'set'; } else { echo 'not set'; }
based on kfjgY
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: key_exists() expects parameter 2 to be array, string given in /in/hLfZv on line 3 not set
Output for hhvm-3.12.0
Warning: Invalid operand type was used: array_key_exists expects an array or an object; false returned. in /in/hLfZv on line 3 not set
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.2 - 5.2.17
Warning: key_exists(): The second argument should be either an array or an object in /in/hLfZv on line 3 not set
Output for 4.3.0 - 4.3.1
Warning: key_exists() [http://www.php.net/function.key-exists]: The second argument should be either an array or an object in /in/hLfZv on line 3 not set