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<?php $a = array(); $a[] = array(); var_dump(empty($a)); var_dump(isset($a)); var_dump(count($a)); var_dump($a); var_dump(array_filter($a) === null);
Output for 4.3.0 - 7.1.0
bool(false) bool(true) int(1) array(1) { [0]=> array(0) { } } bool(false)