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<?php 
session_start();
 if(isset($_POST['captchacod'])){
 if($_SESSION['login']==$_POST['captchacod'])echo'<a style="color:green">Your Entered Cod Was Correct</a><br>';
 else echo'<a style="color:red">Your Entered Cod Was Incorrect</a><br>';
 
 }
 ?>
 <img src="captcha.php?cap=login.png" >
 <form action="<?php echo $_SERVER['PHP_SELF']; //safe it later (xss)?>" method="post">
 <a>INPUT TEXT :</a><br>
 <input type="text" name="captchacod"><br>
 <input type="submit" value="check"><br>
 </form>
 
 
 
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