ZUUF\Validator

<?php
namespace ZUUF;


class Validator {

    private $fields = array();
    private $messages = '';

    public function __construct($fields = null) {

        if (is_array($fields))
            $this->set_fields($fields);
    }

    public function is_valid_one($field, $data) {

        $errors = array();

        foreach($this->fields[$field] as $callback_error_message) {

            if(is_array($callback_error_message[1])) {
                list($callback, $parameters, $message) = $callback_error_message;
                array_unshift($parameters, $data);
            } else {
                list($callback, $message) = $callback_error_message;
                $parameters = array($data);
            }

            if(call_user_func_array($callback, $parameters) === false)
                $errors[] = $message;
        }

        return $this->error($errors);
    }

    public function is_valid_all($fields_data) {

        $fields_errors = array();

        foreach($fields_data as $field => $data)
            if($this->is_valid_one($field, $data) === false)
                $fields_errors[$field] = $this->messages;

        return $this->error($fields_errors);
    }

    private function error($error_messages) {
        if(count($error_messages) === 0)
            return true;
        else {
            $this->messages = $error_messages;
            return false;
        }
    }

    public function get_messages() {
        return $this->messages;
    }

    public function set_fields($fields) {
        $this->fields = $fields;
        return $this;
    }

    public function add_field($field, $validation) {
        $this->fields[$field][] = $validation;
        return $this;
    }

}