How do I generate a php redirect with a dynamically generated url?

Question

I have a php file that was given to me by a company that produces online coupons. The file is supposed to generate a dynamic url and then redirect you to that page. All they told me i needed to do was to create an echo call at the bottom. The $cpt is the only thing that should be dynamically generated in the url so this is what I have and it is not working properly.

 <?php
 //Generate cipher
 function EncodeCPT($pinCode, $offerCode, $shortKey, $longKey){
$decodeX = " abcdefghijklmnopqrstuvwxyz0123456789!$%()*+,-.@;<=>?[]^_{|}~";
$encodeModulo = array_fill(0, 256, 0);

$vob[0] = $offerCode % 100;
$vob[1] = (($offerCode - $vob[0]) / 100) % 100;

for ($i = 0; $i < 61; $i++)
    $encodeModulo[substr($decodeX, $i, 1)] = $i;

$pinCode = strtolower($pinCode) . strval($offerCode);
if (strlen($pinCode) < 20){
    $pinCode .= ' couponsincproduction';
    $pinCode = substr($pinCode, 0, 20);
}

//$checkCode = "LC";
//$pinCode = "LC10";
//$offerCode = "115694";
//$shortKey = "6oigl3qf5e";
//$longKey = "Lm9A7w8tjpUCaoMidGFSYXrHZnyDRKhlTbk1Oz4f5QBsqveEWuxg6PNV2cJ3I";
$q = 0;
$j = strlen($pinCode);
$k = strlen($shortKey);
$s1 = $s2 = $s3 = null;

$cpt = '';

for ($i = 0; $i < $j; $i++){
    $s1 = $encodeModulo[substr($pinCode, $i, 1)];
    $s2 = 2 * $encodeModulo[substr($shortKey, $i % $k, 1)];
    $s3 = $vob[$i % 2];
    $q = ($q + $s1 + $s2 + $s3) % 61;
    $cpt .= substr($longKey, $q, 1);
}
return $cpt;
 }

 echo("http://bricks.coupons.com/enable.asp?0=115694&c=LC&p=LC10&" .$cpt);

 //echo '<META HTTP-EQUIV="Refresh" Content="0; URL=http://bricks.coupons.com /enable.asp?0=115694&c=LC&p=LC10&"($cpt)">';

 ?>

I have tried a couple things but nothing seems to be working. Does any one have any ideas? Thank you in advance.

You need to call the function EncodeCPT before you can use the variable returned by it. — Session
– Session, Commented Jan 9, 2014 at 11:25

Shankar Narayana Damodaran · Accepted Answer · 2014-01-09 11:19:11Z

2

Just use header()

Replace this

echo("http://bricks.coupons.com/enable.asp?0=115694&c=LC&p=LC10&" .$cpt);

with

$cpt = EncodeCPT("yourparameters");
header("location:http://bricks.coupons.com/enable.asp?0=115694&c=LC&p=LC10&$cpt");

answered Jan 9, 2014 at 11:19

Shankar Narayana Damodaran

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Comments

score 1 · Accepted Answer · 2014-01-09 12:32:21Z

1

In your code you’ve defined the function EncodeCPT but you’ve never actually called it. You may think of function definitions as separate from other parts of your script. Any variable used inside a function (unless used with the global keyword) has only a local scope. Therefore, the variables $pinCode, $offerCode, $shortKey, $longKey and $cpt don’t even exist outside the scope of your function (if in doubt, check it with isset). To make them exist, you have to do something like the following:

/* Change these values if necessary */
$pinCode = "LC10";
$offerCode = "115694";
$shortKey = "6oigl3qf5e";
$longKey = "Lm9A7w8tjpUCaoMidGFSYXrHZnyDRKhlTbk1Oz4f5QBsqveEWuxg6PNV2cJ3I";
/* Do not change after this line */
$cpt = EncodeCPT($pinCode, $offerCode, $shortKey, $longKey);
$url = "http://bricks.coupons.com/enable.asp?0=115694&c=LC&p=LC10&".$cpt;

In spite of having identical names, $pinCode, $offerCode, $shortKey, $longKey and $cpt are global variables in the code above. To avoid confusion, you may use different names like $a, $b, $c, $d, $e or any valid variable names of your choice. For a clearer understanding of the matter, read more about variable scope from the PHP manual.

Now comes the redirect part. If you want the script to redirect automatically:

header("location: $url");

On the other hand, if you want the user to click on a link for the redirect:

print("<a href=\"$url\">Click Here</a>");

edited Jan 9, 2014 at 12:32

answered Jan 9, 2014 at 11:20

user2680766

1 Comment

GrayGhost23 Over a year ago

Hey thanks a lot, I meant to reply to this earlier but had to take care of another job. But this worked perfectly thank you.

Lexib0y · Accepted Answer · 2014-01-09 11:26:05Z

0

if you want to use the return value of the function EncodeCPT($pinCode, $offerCode, $shortKey, $longKey) You need to find where this function is called and do something like this:

$cpt = EncodeCPT(parameter1,parameter2,parameter3,parameter4);

and at the end of the script you can then use $cpt, as mentioned by someone else.

header("location:http://bricks.coupons.com/enable.asp?0=115694&c=LC&p=LC10&$cpt");

answered Jan 9, 2014 at 11:26

Lexib0y

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