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<?php $a = array('test'); echo array_key_exists('test', $a['children']);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "children" in /in/e1chX on line 5 Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /in/e1chX:5 Stack trace: #0 {main} thrown in /in/e1chX on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined index: children in /in/e1chX on line 5 Warning: array_key_exists() expects parameter 2 to be array, null given in /in/e1chX on line 5
Output for 7.3.32 - 7.3.33, 7.4.26
Warning: array_key_exists() expects parameter 2 to be array, null given in /in/e1chX on line 5
Output for 5.2.3 - 5.2.17
Warning: array_key_exists(): The second argument should be either an array or an object in /in/e1chX on line 5
Output for 4.4.3 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
<br /> <b>Warning</b>: array_key_exists() [<a href='function.array-key-exists'>function.array-key-exists</a>]: The second argument should be either an array or an object in <b>/in/e1chX</b> on line <b>5</b><br />
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.2
<br /> <b>Warning</b>: array_key_exists(): The second argument should be either an array or an object in <b>/in/e1chX</b> on line <b>5</b><br />
Output for 4.3.0 - 4.3.1
<br /> <b>Warning</b>: array_key_exists() [<a href='http://www.php.net/function.array-key-exists'>function.array-key-exists</a>]: The second argument should be either an array or an object in <b>/in/e1chX</b> on line <b>5</b><br />

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