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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 git.master, git.master_jit, rfc.property-hooks
1 Warning: Undefined array key "bb" in /in/9e3oZ on line 9 1

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