PHP:数组可以将数组作为键值对中的键吗? [英] PHP: Can an array have an array as a key in a key-value pair?

问题描述

我正在为此数组获取非法偏移量类型":

I'm getting an "Illegal offset type" for this array:

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"
        )
    );

制作另一个数组只是为了定义此处的键中定义的内容有点烦人，所以我想知道这是否是我的问题.如果是这样，我想我必须为类别ID和字符串值创建一个键值数组.

it's kind of annoying to make another array just to define what is being defined in the keys here, so i was wondering if that was my problem. if it is, i guess i'll have to make a key-value array for the categories ids and string values.

谢谢！

推荐答案

由于数组键只能是标量值，因此会出现illegal offset type错误.从文档关于数组:

You're getting an illegal offset type error because array keys can only be scalar values. From the documentation on arrays:

键可以是整数或字符串.如果键是整数的标准表示形式，它将被解释为这样(即"8"将被解释为8，而"08"将被解释为"08").键中的浮点数将被截断为整数.

A key may be either an integer or a string. If a key is the standard representation of an integer, it will be interpreted as such (i.e. "8" will be interpreted as 8, while "08" will be interpreted as "08"). Floats in key are truncated to integer.

自self::CAT_CRON_JOBS等以来.看起来它们无论如何都应该是常量，为什么不直接定义它们，使它们的值成为描述文本，然后可以像这样指定数组

Since self::CAT_CRON_JOBS et al. seem like they should be constants anyways, why not just define them so that their value is the description text, and then you could just specify your array like

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.
)

然后您可以使用$CATS_AND_TYPES[self::CAT_STATEMENT_ADMIN](当然是在类中)或$CATS_AND_TYPES['Document Administration']来获取相同的数组元素.

And then you could use either $CATS_AND_TYPES[self::CAT_STATEMENT_ADMIN] (within the class, of course) or $CATS_AND_TYPES['Document Administration'] to get the same array element.

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