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<?php $array_test['first']['two']['three'] = (isset($array_test['first']['two']['three']) ? $array_test['first']['two']['three'] : 0) + 10; var_export($array_test);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'first' => array ( 'two' => array ( 'three' => 10, ), ), )

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