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<?php $array[0]['somekey'] = 'bla'; isset($array[0]['somekey']['someotherkey']) ? print array_key_exists('someotherkey', $array[0]['somekey']) : print 'NOT SET';
based on 8mFB6
Output for 5.0.0 - 5.0.2, 5.4.0 - 7.1.0
NOT SET
Output for 5.3.0 - 5.3.29
Warning: array_key_exists() expects parameter 2 to be array, string given in /in/4gCMp on line 5
Output for 4.3.2 - 4.4.9, 5.0.3 - 5.2.17
Warning: array_key_exists(): The second argument should be either an array or an object in /in/4gCMp on line 5
Output for 4.3.0 - 4.3.1
Warning: array_key_exists() [http://www.php.net/function.array-key-exists]: The second argument should be either an array or an object in /in/4gCMp on line 5