Documentation of My Form validation of codeigniter

We have seen the weakness of Form validation class for codeigniter. Let's see how we can fix this short comings. I have an extended Form validation class of codeigniter. we will discuss it here:

First of all, we are going to combine our $_FILES and $_POST variables together. we use php's array_merge to merge them.

/**
     * Constructor
     *
     * @author Tahsin Hasan 
     * @return void
     * @access public
     */
    public function __construct() {
        $_POST = (count($_FILES) > 0) ? array_merge($_POST,$_FILES) : $_POST;
        parent::__construct();
    }

After merging them together, we call our parent constructor function.

/**
     * Allowed types rule
     *
     * @author Tahsin Hasan 
     * @return bool
     * @param  str String field name to validate
     * @param  types String allowed types
     * @access public
     */
    public function allowed_types($str, $types)
    {
        $type = explode(',', $types);
        $filetype = pathinfo($str['name'],PATHINFO_EXTENSION);
        return (in_array($filetype, $type)) ? TRUE : FALSE;
    }

We are using two new rules for upload functions: allowed_types and max_file_size. In the allowed_types function we can set a range of allowed file types for our uploaded file.

/**
     * Setting maximum file upload size
     *
     * @author Tahsin Hasan 
     * @return bool
     * @param  str String field name to validate
     * @param  size Integer maximum upload size in bytes
     * @access public
     */

    public function max_file_size($str, $size)
    {
        return ($str['size']<=$size) ? TRUE : FALSE;
    }

In the max_file_size rule we checking the uploaded file whether it is uploaded in the specified file upload size.
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