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<?php $test = array('key1'=>'value'); $test[] = array('key2' => 'val2', array('key3' => 'val3', 'key4' => 'val4')); var_dump($test);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["key1"]=> string(5) "value" [0]=> array(2) { ["key2"]=> string(4) "val2" [0]=> array(2) { ["key3"]=> string(4) "val3" ["key4"]=> string(4) "val4" } } }