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<?php $data = array('key' => null); var_dump(isset($data['key'])); var_dump(array_key_exists($data, 'key')); var_dump(isset($data['key']) && $data['key']);
based on qT3vQ
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
bool(false) Warning: array_key_exists() expects parameter 2 to be array, string given in /in/q3qHM on line 5 NULL bool(false)
Output for hhvm-3.10.0 - 3.12.0
bool(false) Warning: Invalid operand type was used: array_key_exists expects an array or an object; false returned. in /in/q3qHM on line 5 bool(false) bool(false)
Output for 4.3.2 - 5.2.17
bool(false) Warning: array_key_exists(): The second argument should be either an array or an object in /in/q3qHM on line 5 bool(false) bool(false)
Output for 4.3.0 - 4.3.1
bool(false) 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/q3qHM on line 5 bool(false) bool(false)