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<?php $one = array('key'=>'val'); $two = array(0=>array('key1'=>'val1'), 1=>array('key2'=>'val2')); array_unshift($one, $two); var_dump($one + $two);
Output for 4.3.0 - 7.1.0
array(3) { [0]=> array(2) { [0]=> array(1) { ["key1"]=> string(4) "val1" } [1]=> array(1) { ["key2"]=> string(4) "val2" } } ["key"]=> string(3) "val" [1]=> array(1) { ["key2"]=> string(4) "val2" } }