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<?php $t = array(); $t['aa']['b'] = 'aaa'; print (isset($t['aa']['b'])); print (isset($t['aa']['bb'])); print (null == $t['aa']['b']); print (null == $t['aa']['bb']);
Output for 5.3.0 - 7.1.0
1 Notice: Undefined index: bb in /in/9e3oZ on line 9 1
Output for 4.3.0 - 5.2.17
1 Notice: Undefined index: bb in /in/9e3oZ on line 9 1