apisongcan/application/index/validate/UserValidate.php

<?php

namespace app\index\validate;

use think\Validate;

class UserValidate extends Validate
{
    protected $rule = array(
        'user_name'   => 'require|unique:user',
        'password'   => 'require',
        'repassword' => 'require|confirm:password'
    );
    protected $message = array(
        'user_name.require'     => '用户名必须',
        'user_name.unique'      => '用户名已存在',
        'password.require'      => '密码必须',
        'repassword.require'    => '确认密码和密码必须一致',
    );
}