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<?php $a = 'true'; var_dump(empty($a['foo'])); var_dump(isset($a['foo'])); $a = 'false'; var_dump(empty($a['foo'])); var_dump(isset($a['foo']));
Output for 5.0.0 - 5.0.2, 5.4.0 - 7.1.0
bool(true) bool(false) bool(true) bool(false)
Output for 4.3.0 - 4.4.9, 5.0.3 - 5.3.29
bool(false) bool(true) bool(false) bool(true)