- print_r: documentation ( source)
- array_merge: documentation ( source)
- array_values: documentation ( source)
<?php
$arr=array('3'=>array("a","b","c"),'4'=>array("d","e"));
echo "<pre>";print_r(array_merge(array_values($arr)));
echo "<pre>";print_r(call_user_func_array('array_merge', $arr));
;