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<?php $foo = array('bar' => 'baz'); var_dump($foo['bar']); var_dump(isset($foo->bar));
Output for 4.3.0 - 4.4.9, 5.2.12 - 5.2.17, 5.3.2 - 7.2.0
string(3) "baz" bool(false)
Output for 5.0.0 - 5.2.11, 5.3.0 - 5.3.1
string(3) "baz" bool(true)