- var_dump: documentation ( source)
- array_merge: documentation ( source)
<?php
$foo = array('a' => 'ert', 'b' => 'rzz', 'c' => 'tt', 'd' => '', 'e' => '', );
$bar = array('a' => 'foo', 'd' => 'foo', );
$merged = array_merge($foo, $bar);
var_dump($merged);