Page does not redirect with header

PHP
1

Hi All

Please somehelp me to correct my code so that after the user click the submit button it redirects to the correct URL if the value is correct. I get the error when pressing submit this php file will be displayed in an iframe
Error
Warning: Cannot modify header information - headers already sent by


        <?php

        function test_input($data) {
            $data = trim($data);
            $data = stripslashes($data);
            $data = htmlspecialchars($data);
            return $data;
        }

        $amountErr = "";
        $amount = "";
        if ($_SERVER["REQUEST_METHOD"] == "POST") {
            if (($_POST["amount"]) < 250) {
                $amountErr = "Value must be equal or greater than 250";
            } else {
                $amount = test_input($_POST["amount"]);
                header('location:https://www.moneybookers.com/app/payment.pl');
            }
        }
        ?>


        <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>"

            <p><span class="error">*required field.</span></p>
            Amount:<input type="text" name="amount"/>
            <span class="error">*<?php echo $amountErr; ?></span><bR>

             <input type="hidden" name="pay_to_email" value="someone.com"/>
             <input type="hidden" name="status_url" value="someone.com"/>
             <input type="hidden" name="return_url" value="http://wwww.somesite.com"/>
             <input type="hidden" name="language" value="EN"/>
             <input type="hidden" name="currency" value="USD"/>
             <input type="hidden" name="detail1_description" value="New Deposit"/>
             <input type="hidden" name="detail1_text" value="New Deposit"/><BR>
             <input type="submit" value="Deposit!"/>
2

In this stage you have to use javascript /jQuery instead of php. Here is replacement for your code.


<script type="text/javascript">
function isNumber(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}
function validateForm(obj) {
   if (obj.amount.value == '') {
      document.getElementById("error").innerHTML = 'Please enter any amount!';
      return false;
   }

   if (!isNumber(obj.amount.value) && obj.amount.value < 250) {
      document.getElementById("error").innerHTML = 'Value must be equal or greater than 250';
      return false;
   }

   return true;
}
</script>

        <form method="post" action="https://www.moneybookers.com/app/payment.pl" onsubmit="return validateForm(this);">
        
            <p><span class="error">*required field.</span></p>
            Amount:<input type="text" name="amount"/>
            <span class="error" id="error"></span><bR>
            
             <input type="hidden" name="pay_to_email" value="someone.com"/>
             <input type="hidden" name="status_url" value="someone.com"/>
             <input type="hidden" name="return_url" value="http://wwww.somesite.com"/>
             <input type="hidden" name="language" value="EN"/>
             <input type="hidden" name="currency" value="USD"/>
             <input type="hidden" name="detail1_description" value="New Deposit"/>
             <input type="hidden" name="detail1_text" value="New Deposit"/><BR>
             <input type="submit" value="Deposit!"/>
3

I think the header redirect only works before the HTML <head>
If you cut and paste that chunk of PHP to the very beginning of your document, it should work.

4

Forget about the iframe and use jQuery load. Make the submit into the main page so, action=“” (you don’t need action=“<?php echo htmlspecialchars($_SERVER[“PHP_SELF”]); ?>” - this is a bad practice, for many reasons). Also, make sure that the PHP code is in the first place, no spaces before it, no output. The file must begin with


<?php

if( stuff ) {

    header('Location: page.php');
    exit; // do not forget about exit
}
?> Here you have
Your HTML code and other output
5

Hi Thank you for responding. I have tried the above but the javascript code is not validating or getting called

6