- unserialize: documentation ( source)
<?php
$res = "month1%5B%5D=4&sap=721&name=uname&month1%5B%5D=10000.00&month2%5B%5D=10000.00&month3%5B%5D=0.00&month4%5B%5D=&month5%5B%5D=&month6%5B%5D=&month1%5B%5D=15000&month2%5B%5D=0.00&month3%5B%5D=0.00&month4%5B%5D=&month5%5B%5D=&month6%5B%5D=&month1%5B%5D=50&month2%5B%5D=50&month3%5B%5D=50&month4%5B%5D=&month5%5B%5D=&month6%5B%5D=&month1%5B%5D=15000&month2%5B%5D=10000&month3%5B%5D=0&month4%5B%5D=0&month5%5B%5D=0&month6%5B%5D=0&sap_data%5B%5D=&sap_data%5B%5D=&sap_data%5B%5D=&sap_data%5B%5D=";
echo unserialize($res);