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<?php $header = array('test'); if (key_exists('class', $header[0])) { echo 'set'; } else { echo 'not set'; }
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: key_exists(): Argument #2 ($array) must be of type array, string given in /in/hLfZv:3 Stack trace: #0 /in/hLfZv(3): key_exists('class', 'test') #1 {main} thrown in /in/hLfZv on line 3
Process exited with code 255.

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