I'm not familiar with cookie, can you make a code example for me?

Code: 
p=md5(md5(password)email)

PHP exemple:
     $clearTextPassword = '1234';
     $email = 'a@b.c';

     $encryptedPassword = md5(md5($clearTextPassword) . $email);
And yes they show the code, but how I send those variables to File Sonic to I get back the XML file?