- var_dump: documentation ( source)
- array_slice: documentation ( source)
- array_merge: documentation ( source)
<?php
$tmp = array(
'q1' => 'qwqwqw',
'w2' => 'www',
'r3'=> 'eee',
'u8'=>'333e',
);
$tmp = array_merge(array_slice($tmp,0,2, false), array('third' => 'ddddddddd'),array_slice($tmp,2));
var_dump($tmp);