Question

我尝试使用另一个的内容初始化静态var，但似乎失败了。

class Hey {
    static $user = "peter";
    static $home = '/home'.Hey::$user;

    // syntax error, unexpected T_VARIABLE, expecting T_STRING

为什么它会失败并且没有init-function或其他东西？

Answer 1

class Hey {
    static $user = "peter";
    static $home;
}
Hey::$home =  '/home'.Hey::$user;

或$ home是私有的：

class Hey {
    static $user = "peter";
    private static $home;
    static function init(){self::$home = '/home'.self::$user;}
}
Hey::init();