<?php 
 
// Begin the session 
session_start(); 
 
// To avoid case conflicts, make the input uppercase and check against the session value 
// If it's correct, echo '1' as a string 
if(strtoupper($_GET['captcha']) == $_SESSION['captcha_id']) 
    echo 'true'; 
// Else echo '0' as a string 
else 
    echo 'false'; 
 
?>
 
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