- urlencode: documentation ( source)
<?php
$link = "rnd=301274.40649084747&Value=59.5&OrderID=100029725&ProductID=0001/102/1&ProductInfo=Short%20Sleeve%20Crew%20Neck%20T-Shirt&Quantity=1";
echo 'https://bs.serving-sys.com/Serving/ActivityServer.bs?cn=as&ActivityID=513910&';echo urlencode($link);