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Bugs & Features
<?php $array = array('foo' => null); var_export($array); echo "\nisset? "; var_export(isset($array['foo'])); echo "\narray_key_exists? "; var_export(array_key_exists('foo', $array)); echo "\n";
Output for 4.3.0 - 7.2.0
array ( 'foo' => NULL, ) isset? false array_key_exists? true