PHP: Encode decode point in url $_GET urldecode

Question

I have: http://www.example.com/index.php?amount=15%252E8

In index.php:

    $test = $_GET['amount'];
    echo $test; 

    // Output: 15%2E8

But I don't need 15%2E8, I need 15.8

    $test = $_GET['amount'];
    $test = urldecode($test);
    echo $test; 
    
    //Output: 15.8

But in https://www.php.net/manual/en/function.urldecode.php they warn:

Warning: The superglobals $_GET and $_REQUEST are already decoded. Using urldecode() on an element in $_GET or $_REQUEST could have unexpected and dangerous results.

Why $_GET['amount'] does not get 15.8 ?!

You're url example shows 15%252E8 but your Output example shows 15%2E8. Is this a typo or is it really dropping off the '25' in the middle? — shanabus
– shanabus, Commented Oct 30, 2013 at 17:58

deceze · Accepted Answer · 2013-10-30 13:58:35Z

4

15%252E8 is the URL encoded version of "15%2E8".
15%2E8 is the URL encoded version of "15.8".
If you want "15.8", you should be sending 15%2E8 in the URL.

I.e. you're URL-encoding one time too many somewhere.

answered Oct 30, 2013 at 13:58

deceze♦

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