Question

I am having trouble calling a specific function within a class. The call is made:

   case "Mod10":        
        if (!validateCreditCard($fields[$field_name]))
      $errors[] = $error_message;
    break;

and the class code is:

class CreditCardValidationSolution {

    var $CCVSNumber = '';
    var $CCVSNumberLeft = '';
    var $CCVSNumberRight = '';
    var $CCVSType = '';
    var $CCVSError = '';

function validateCreditCard($Number) {

        $this->CCVSNumber      = '';
        $this->CCVSNumberLeft  = '';
        $this->CCVSNumberRight = '';
        $this->CCVSType        = '';
        $this->CCVSError       = '';

        // Catch malformed input.

        if (empty($Number) || !is_string($Number)) {
            $this->CCVSError = $CCVSErrNumberString;
            return FALSE;
        }

        // Ensure number doesn't overrun.
        $Number = substr($Number, 0, 20);

        // Remove non-numeric characters.
        $this->CCVSNumber = preg_replace('/[^0-9]/', '', $Number);

        // Set up variables.
        $this->CCVSNumberLeft  = substr($this->CCVSNumber, 0, 4);
        $this->CCVSNumberRight = substr($this->CCVSNumber, -4);
        $NumberLength          = strlen($this->CCVSNumber);
        $DoChecksum            = 'Y';

        // Mod10 checksum process...
        if ($DoChecksum == 'Y') {

            $Checksum = 0;

            // Add even digits in even length strings or odd digits in odd length strings.
            for ($Location = 1 - ($NumberLength % 2); $Location < $NumberLength; $Location += 2) {
                $Checksum += substr($this->CCVSNumber, $Location, 1);
            }

            // Analyze odd digits in even length strings or even digits in odd length strings.
            for ($Location = ($NumberLength % 2); $Location < $NumberLength; $Location += 2) {
                $Digit = substr($this->CCVSNumber, $Location, 1) * 2;
                if ($Digit < 10) {
                    $Checksum += $Digit;
                } else {
                    $Checksum += $Digit - 9;
                }
            }

            // Checksums not divisible by 10 are bad.
            if ($Checksum % 10 != 0) {
                $this->CCVSError = $CCVSErrChecksum;
                return FALSE;
            }
        }

        return TRUE;
}
}

When I run the application – I get the following message:

Fatal error: Call to undefined
function validateCreditCard() in
C:\xampp\htdocs\validation.php
on line 339

any ideas?

Answer 1

Does the class containing the function within which you use the Switch-Case inherit the CreditCardValidationSolution Class….??

My guess would be that you are trying to call the function outside the class without inheriting it…. Maybe you just missed it….

Edit After Reading Comment :
What you need here is “Inheritance”

Take a look at the following links…..

http://www.killerphp.com/tutorials/object-oriented-php/php-objects-page-4.php

http://marakana.com/blog/examples/php-inheritance.html

Hope this helps….