PHP Login not returning anything

Hello, I have been trying to code a login script. My problem is, it appears that my w.text is always empty when it returns to unity. Below I have linked to my codes. What am I doing wrong? Everything seems right but nothing is getting returned to unity from the php file. Am I not supposed to use echo? Should I use return?

Unity C# Code:
C# Code
PHP Code:
PHP Code

You are doing it all correctly execpt one thing, there is a no function in PHP that will be called automatically. Your main function has to be called somewhere inside that php script. probally like

<?php 

   function main($formUse = true){.....}
   // calling the main funciton here
   main(true);
   // Close mySQL Connection
 
   mysql_close();
?>

other than that everything looks fine. Or you can remove the whole function setup and jus write the statements inside that function outside. Both the ways it would work