Another Form Validation callback's improvement

[eluser]Unknown[/eluser]
Hi to all

I want to share with all my own version of this library with better support for callbacks

Example usage:

Code:

// Register the callback 'foo_bar' which is a method inside the current object, i.e. a model object
$this->form_validation->set_callback('foo_bar', array($this, 'foo_bar'));

// The example rule
$this->form_validation->set_rules('my_field', 'My field', 'trim|required|max_lenght[45]|callback[foo_bar,1,2,3]');

// The callback method
public function foo_bar($str, $arg1, $arg2, $arg3)
{
return $arg1 + $arg2 + $arg3;
}

// Inside a language file...
$lang['callback_foo_bar'] = "blah blah blah blah...';

And here's the code

Code:

/**
* Enhanced callback functionality
*
* @author Miguel Ayllón
*/
class MY_Form_validation extends CI_Form_validation
{

    var $_callbacks = array();


    public function __construct($rules = array())
    {
        parent::__construct($rules);
    }


    /**
     * Register a callback
     *
     * @param string $name
     * @param callback $func
     */
    public function set_callback($name, $func)
    {
        $this->_callbacks[$name] = $func;
    }


    /**
     * Runs a registered callback
     *
     * @param string $str
     * @param mixed $args
     * @return mixed
     */
    public function callback($str, $args = '')
    {
        // Parse comma separated arguments
        if ( ! is_array($args))
        {
            $args = explode(',', $args);
        }

        // Find the callback
        if (count($args))
        {
            $name = array_shift($args);
            if (isset($this->_callbacks[$name]) && is_callable($this->_callbacks[$name]))
            {
                array_unshift($args, $str);
                $result = call_user_func_array($this->_callbacks[$name], $args);

                // Set an error message if required
                if ($result === FALSE)
                {
                    if (FALSE === ($line = $this->CI->lang->line('callback_' . $name)))
                    {
                        $line = 'Callback: Unable to access an error message corresponding to your field name.';
                    }

                    $this->set_message('callback', $line);
                }

                return $result;
            }
        }

        return FALSE;
    }

}

Hope you find useful