php - 静态变量问题

Question

我定义了这个静态变量，但我的代码出现错误:

..意外的“$_SERVER”(T_VARIABLE)在......

class Constants {
        const ACCOUNTTYPE_SUPER_ADMIN   = 1;
        const ACCOUNTTYPE_COMPANY_ADMIN = 2;
        const ACCOUNTTYPE_AREA_ADMIN    = 3;
        const ACCOUNTTYPE_END_USER      = 4;

        const SAVETYPE_NEW              = 0;
        const SAVETYPE_EDIT             = 1;

        const LICENSE_VALIDITY_YEARS    = 1;
        const LICENSE_VALIDITY_LEFT_MAX = 12;

        public static $template_path = $_SERVER['DOCUMENT_ROOT'] . '/../_html/';
}

Answer 1

您不能以这种方式使用变量声明静态变量，但您可以使用变通方法:

class Constants {
    ...

    public static $template_path;
}

Constants::$template_path = $_SERVER['DOCUMENT_ROOT'] . '/../_html/';