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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array('foo' => "xyz", null => "abc"); var_dump(isset($a[null])); var_dump(isset($a['foo'])); var_dump(array_key_exists($a, null));
Output for 5.3.0 - 7.1.0
bool(true) bool(true) Warning: array_key_exists() expects parameter 2 to be array, null given in /in/P7VFV on line 7 NULL
Output for 4.3.2 - 5.2.17
bool(true) bool(true) Warning: array_key_exists(): The second argument should be either an array or an object in /in/P7VFV on line 7 bool(false)
Output for 4.3.0 - 4.3.1
bool(true) bool(true) 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/P7VFV on line 7 bool(false)