PHP：數組是否可以將數組作為鍵值對中的鍵？

Question

我為這個數組得到了一個“非法偏移類型”：

public static $CATS_AND_TYPES = array(

        // Statement Administration
        array( self::CAT_STATEMENT_ADMIN => "Document Administration" ) => array(
            self::TYPE_STATEMENTS_LOADED => "Documents Loaded",
            self::TYPE_STATEMENTS_REMOVED => "Documents Removed"
        ),

        // Cron Jobs
        array( self::CAT_CRON_JOBS => "Cron Jobs" ) => array(
            self::TYPE_CRON_BULLETIN_RUN => "Bulletin Cron Job Ran",
            self::TYPE_CRON_EMAILER_RUN => "Emailer Cron Job Ran",
            self::TYPE_CRON_SURVEY_RUN => "Survey Cron Job Ran",
            self::TYPE_CRON_JOURNEY_RUN => "Journey Cron Job Ran",
            self::TYPE_CRON_DOCUMENT_RUN => "Document Cron Job Ran"
        ),

        // Global Administration
        array( self::CAT_GLOBAL_ADMIN => "Global Administration" ) => array(
            self::TYPE_GLOBAL_MAINTENANCE => "Global Maintenance",
            self::TYPE_GLOBAL_EMAIL_SENDING => "Email Sending"
        ),

        // Email Administration
        array( self::CAT_EMAIL_ADMIN => "Email Administration" ) => array(
            self::TYPE_EMAIL_SENT => "Email Sent",
            self::TYPE_EMAIL_RESENT => "Email Resent",
            self::TYPE_EMAIL_REMOVED => "Email Removed"
        ),

        // DCVs Administration
        array( self::CAT_DCVS_ADMIN => "DCVs Administration" ) => array(
            self::TYPE_DCVS_FLEX_UPDATED => "Flexible Variables Updated",
            self::TYPE_DCVS_GLOBAL_UPDATED => "Global Variables Updated"
        ),

        // Video Administration
        array( self::CAT_VIDEO_ADMIN => "Video Administration" ) => array(
            self::TYPE_VIDEO_ADDED => "Video Added",
            self::TYPE_VIDEO_EDITED => "Video Edited",
            self::TYPE_VIDEO_REMOVED => "Video Removed"
        ),

        // Bulletin Board Administration
        array( self::CAT_BULLETIN_BOARD => "Bulletin Board Administration" ) => array(
            self::TYPE_BULLETIN_DELETED => "Message Deleted",
            self::TYPE_BULLETIN_EDITED => "Message Edited",
            self::TYPE_BULLETIN_ADDED => "Message Added"
        ),

        // User Administration
        array( self::CAT_USER_ADMIN => "User Administration" ) => array(
            self::TYPE_USER_ADDED => "User Added",
            self::TYPE_USER_ADDED_MULTI => "Multiple Users Added",
            self::TYPE_USER_REMOVED => "User Removed",
            self::TYPE_USER_REMOVED_MULTI => "Multiple Users Removed",
            self::TYPE_USER_UPDATED => "User Updated"
        ),

        // Survey Administration
        array( self::CAT_SURVEY_ADMIN => "Survey Administration" ) => array(
            self::TYPE_SURVEY_ADDED => "Survey Added",
            self::TYPE_SURVEY_UPDATED => "Survey Updated",
            self::TYPE_SURVEY_REMOVED => "Survey Removed",
            self::TYPE_SURVEY_REMOVED_MULTI => "Multiple Surveys Removed"
        )
    );

制作另一個數組只是為了定義鍵中定義的內容，這有點煩人，所以我想知道這是不是我的問題。 如果是，我想我將不得不為類別ID和字符串值創建一個鍵值數組。

謝謝！

Answer 1

您將收到illegal offset type錯誤，因為數組鍵只能是標量值。 從數組的文檔 ：

鍵可以是整數或字符串。 如果一個鍵是整數的標准表示，它將被解釋為這樣（即“8”將被解釋為8，而“08”將被解釋為“08”）。 鍵中的浮點數被截斷為整數。

自從self::CAT_CRON_JOBS等。 看起來它們應該是常量，為什么不定義它們以使它們的值是描述文本，然后你可以只指定你的數組

const CAT_STATEMENT_ADMIN = "Document Administration";

public static $CATS_AND_TYPES = array(

  // Statement Administration
  self::CAT_STATEMENT_ADMIN => array(
    self::TYPE_STATEMENTS_LOADED => "Documents Loaded",
    self::TYPE_STATEMENTS_REMOVED => "Documents Removed"
  ),

  // etc.
)

然后你可以使用$CATS_AND_TYPES[self::CAT_STATEMENT_ADMIN] （當然在類中）或$CATS_AND_TYPES['Document Administration']來獲得相同的數組元素。

Answer 2

不可以。數組只能有整數和字符串作為鍵。

您可以使用SplObjectStorage模擬數組並將對象用作鍵。 但是沒有數組。

Answer 3

我認為這是你的問題：P

我會像這樣處理問題

public static $CATS_AND_TYPES = array(

    self::CAT_STATEMENT_ADMIN => array(
        self::TYPE_STATEMENTS_LOADED,
        self::TYPE_STATEMENTS_REMOVED
    ),

    // ...
);

public static $TRANSLATIONS = array(
    self::CAT_STATEMENT_ADMIN => 'Email Administration',
    self::TYPE_STATEMENTS_LOADED = "Documents Loaded",
// ...

我猜這基本上就是你所說的“制造另一個陣列”。 這是解決問題的正確方法，因為它將翻譯和層次信息分開。

想象一下，當您想將項目翻譯成另一種語言時。 如果你雇用了翻譯，他不應該知道你的項目的層次結構，因為他只應該翻譯。 您還可以將$TRANSLATIONS提取到另一個文件中，以便您可以將該文件分發給99個翻譯人員，您的項目將在一天內使用多語言！

如果您如此傾向，可以將數組序列化為標量值，以便它可以作為鍵。

// Untested
public static $CATS_AND_TYPES = array(
    serialize(array(self::CAT_STATEMENT_ADMIN=>"Documents and Administration")) => array(
        self::TYPE_STATEMENTS_LOADED => "Documents Loaded"
        // ...
    )
);

// You can later get back the values
foreach(self::CATS_AND_TYPES as $k=>$v)
{
    $title = unserialize($k);
    displayTitle($title[0]);

    foreacH($v as $bar) displaySubtitle($bar);
}