FormChecker

class FormChecker {

    private $postdata;

    function __construct($POST) {
        $this->setPostData($POST);
    }

    private function setPostData($POST) {
        if(is_array($POST)) {
            foreach($POST as $key => $value) {
                $this->postdata[$key] = trim($value);
            }
        } else $this->postdata = array();
    }

    private function checkPostData($key, $expression, $length = false) {
        if(!isset($this->postdata[$key])) return 0;
        $regexp = $length ? '/'.$expression.'{'.$length.'}/' : '/'.$expression.'/';
        $check = preg_match($regexp, $this->postdata[$key]);
        var_dump($check);
        return $check ? 1 : 0;
    }
 
    public function isNumeric($key) {
        $c = $this->checkPostData($key, '^[0-9]{1,}$');
        return $c;
    }
    
}