<?php

$string = "
div-item-0,4,maintype:menu| heading: Quick Link|  isactive:1,0,0,  
div-item-1,4,maintype:text| heading:Image|  isactive:1,4,0,  
div-item-2,4,maintype:social| heading:Social|  isactive:1,8,0";


$temp = explode(',', trim($string));
$temp = array_chunk($temp, 5);
foreach($temp as &$value) $value = (implode(',', $value));

var_dump($temp);