- var_dump: documentation ( source)
- array_merge: documentation ( source)
<?php
$array1 = array('foo' => 'bar');
$array2 = array(1 => 2);
$array3 = array('baz' => 'bat');
$array4 = array('lorem' => 'ipsum');
$array5 = array('poop' => 'smelly');
var_dump(call_user_func_array('array_merge', array($array1, $array2, $array3, $array4, $array5)));