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<?php $one = array(array('key'=>'val')); $two = array(array('key1'=>'val1'),array('key2'=>'val2')); array_unshift($two, $one); print_r($two);
Output for 4.3.0 - 7.1.0
Array ( [0] => Array ( [0] => Array ( [key] => val ) ) [1] => Array ( [key1] => val1 ) [2] => Array ( [key2] => val2 ) )