- var_dump: documentation ( source)
- array_merge: documentation ( source)
<?php
$a = array();
$a[] = array('a'=>1);
$a[] = array('a'=>2);
$a[] = array('a'=>3);
$b = array();
$b[] = array('a'=>1, 'b'=>2);
$b[] = array('a'=>2, 'b'=>2);
$b[] = array('a'=>3, 'b'=>2);
$c = array_merge($a, $b);
var_dump($c);