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run code in 150+ php & hhvm versions
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<?php $one = array(array('key'=>'val')); $two = array(array('key1'=>'val1'),array('key2'=>'val2')); //array_unshift($one, $two); print_r($one + $two);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [key] => val ) [1] => Array ( [key2] => val2 ) )