数组键作为对象属性 - Array key as object property

Array key as object property

本文关键字：对象属性数组 | 更新日期: 2023-09-27

我有一个PHP类，它有一些静态属性，比如：

static public $_TYPE_DESIGN_DRAFT = 'design_draft';
static public $_TYPE_STORYTELLING_DRAFT = 'storytelling_draft';
static public $_TYPE_OTHER = 'other';
static public $_TYPE_DATA_FILE = 'data_file';
static public $_ALLOWED_EXTENSIONS = array(       // on the next line it breaks
                self::$_TYPE_DESIGN_DRAFT => array("jpeg", "jpg", "png", "gif", "pdf", "txt", "rtf", "doc", "csv"),
                self::$_TYPE_STORYTELLING_DRAFT => array("jpeg", "jpg", "png", "gif", "pdf", "txt", "rtf", "doc", "csv"),
                self::$_TYPE_OTHER => array("jpeg", "jpg", "png", "gif", "pdf", "txt", "rtf", "doc", "csv"),
                self::$_TYPE_DATA_FILE => array("pdf", "txt", "rtf", "doc", "csv", "xls")
);

但PHP似乎不允许我定义这样一个数组，将键的值定义为同一类的静态属性。

一个解决方法是只在类的构造函数中定义$_ALLOWED_EXTENSIONS var，但我不能将其设为static，因为当它是静态的时，构造函数不会被调用。

有没有有效的解决方法？

不能像这样使用类属性。

根据我的评论；你能不做这样的事吗？

class Test
{
    static public $_TYPE_DESIGN_DRAFT = 'design_draft';
    static public $_TYPE_STORYTELLING_DRAFT = 'storytelling_draft';
    static public $_TYPE_OTHER = 'other';
    static public $_TYPE_DATA_FILE = 'data_file';
    static public $_ALLOWED_EXTENSIONS = array();
    public static function init()
    {
        self::$_ALLOWED_EXTENSIONS = array(
            self::$_TYPE_DESIGN_DRAFT => array("jpeg", "jpg", "png", "gif", "pdf", "txt", "rtf", "doc", "csv"),
            self::$_TYPE_STORYTELLING_DRAFT => array("jpeg", "jpg", "png", "gif", "pdf", "txt", "rtf", "doc", "csv"),
            self::$_TYPE_OTHER => array("jpeg", "jpg", "png", "gif", "pdf", "txt", "rtf", "doc", "csv"),
            self::$_TYPE_DATA_FILE => array("pdf", "txt", "rtf", "doc", "csv", "xls")       
        );      
    }
}
Test::init();
print_r(Test::$_ALLOWED_EXTENSIONS);