1

我有一个带有一些静态属性的 PHP 类，如下所示：

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")
);

但似乎 PHP 不允许我用键的值作为同一个类的静态属性来定义这样的数组。

一种解决方法是只$_ALLOWED_EXTENSIONS在类的构造函数中定义 var，但是我不能这样做，static因为当静态时，构造函数不会被调用。

有没有有效的解决方法？

4

1 回答 1

3

你不能像这样使用类属性。

继我的评论之后；你能不做这样的事情吗？

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);
于 2012-08-29T12:45:22.450 回答