gotcha help

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how to get the strings to match cheers.

 

<?php
$fileRand = md5(rand(100000,999999));
$string_a = array("A","B","C","D","E","F","G","H","J","K",
"L","M","N","P","R","S","T","U","V","W","X","Y","Z",
"2","3","4","5","6","7","8","9");
$keys = array_rand($string_a, 6);
foreach($keys as $n=>$v){
$string .= $string_a[$v];
}
if($_GET['cmd']=="protect"){
if($x==$s){
echo"correct";
}else{
echo"incorrect";
}
  }
?>
<p></p>
<table align="center" width="600" border="4" bordercolor="black">
<td align="center">

<table width="290" border="4" bordercolor="black">
<td align="center">

<form method="POST" action="register.php?cmd=protect&string_result=<?php echo $string?>">
<br>
<font color="yellow">Username
<br>
<input type ="text" name="name">
<br>
<br>
Password
<br>
<input type="password" name="password">
<br>
<br>
Valid Email Address</font>
<br>
<input type="text" name="mail">
<br>
<br>
<?php echo "<font color='blue'>$string</font>";?>
<br>
<input type="string" name="s" value="Please enter code... ">

<input type="hidden" name="x" value="<?php $x=$_GET['string_result'];?>">
<br>
<br>
<input type="submit" name="submit" value="Register">
<br>
</form>
</table></td>