- var_dump: documentation ( source)
- array_merge_recursive: documentation ( source)
<?php
$res1 = array(
array('a'=>'aa','b'=>'bb'),
array('a'=>'aaa','b'=>'bbb')
);
$res2 = array(
array('a'=>'a','b'=>'b')
);
$res3 = array_merge_recursive($res1 + $res2);
var_dump($res3);