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Go Away ! Basic safeguard for pages

By Peter Garner
on December 13, 2002

I built a series of WAP pages which required a single PIN to access the final page. Each page normally passes on the $PIN variable. I wanted to ensure that an opportunistic viewer could not just go straight to the final page, so I used a simple variable test prior to sending the real header. Therefore if the variable $PIN is not set, you’ll get a “page not found” error. Don’t trust National Secrets to this scheme, but to deter Mr Average it works fine 🙂

if ( empty($PIN) )
        header("HTTP/1.0 404 Not Found");

header("Content-type: text/vnd.wap.wml");
echo "<?xml version="1.0"?&gt;";
echo "<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN""
        . " "http://www.wapforum.org/DTD/wml_1.1.xml"&gt;";
.... etc