book_admin/application/common/constants/Common.php

<?php
/**
 * Created by PhpStorm.
 * User: lts
 * Date: 25/9/18
 * Time: 下午7:48
 */

namespace app\common\constants;
class Common
{
    const YES = 1;
    const NO = 0;

    const STATUS_NORMAL = 'normal';
    const STATUS_HIDDEN = 'hidden';

    /**
     * 判断字符串是否为json格式
     * @param $string
     * @return bool
     */
    public static function isJson($string)
    {
        json_decode($string);
        return (json_last_error() == JSON_ERROR_NONE);
    }

}