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run code in 150+ php & hhvm versions
Bugs & Features
<?php $array[0]['somekey'] = 'bla'; isset($array[0]['somekey']['someotherkey']) ? print array_key_exists($array[0]['somekey'], 'someotherkey') : print 'NOT SET';
based on Mq2tN
Output for 5.0.0 - 5.0.2, 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
NOT SET
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Warning: array_key_exists() expects parameter 2 to be array, string given in /in/8mFB6 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/8mFB6 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/8mFB6 on line 5