Bug #69948
Updated by Oliver Hader over 9 years ago
Accessing array indexes that actually do not exist results in PHP warnings. This behavior is caught by using isset() or empty() but is not if using array_key_exists() on invalid array (e.g. NULL values).
Example warning:
@PHP Warning: array_key_exists() expects parameter 2 to be array, null given in typo3/master/typo3/sysext/core/Classes/DataHandling/DataHandler.php line 1640@