Getting an Parse error: I dont understand this wired code:5

I am trying to parse the serialized string.

Serialized String:

4"I¸ÒÄÊ¯+è¾dªð¬£"ë/@2`Mozilla/5.0 (Windows; U; Windows NT 5.1; 
en-US; rv:1.8.1.2pre) Gecko/20070118 
Firefox/2.0.0.2preZhttp://some.gcn.site.combeà3lá8G³QõB?1??sy>r¿"  2
©³´¶¾Jùñ#y%·x ªgfbk_It_czw8BMZ5WDHeyAGai8²GCèèøÂ<2753¸Ö=ÈNÑ
X$·

Original issue reported on code.google.com by a...@tapit.com on 3 Dec 2013 at 7:16

walker1011 / pb4php

Getting an Parse error: I dont understand this wired code:5 #23