类常量作为数组的键 [英] Class constant as array key

问题描述

请看看下面code：

  ...
类LanguageResources {
    常量SESSION_LANGUAGE_KEY ='郎';    公共静态功能getLanguageSettingsFilePath（）{        如果（使用isset（$ _ GET [LanguageResources :: SESSION_LANGUAGE_KEY]））{
....
 

我获得最后一行的PHP错误信息。有什么问题通过常数值数组索引访问？

 注意：未定义的常量SESSION_LANGUAGE_KEY用途 - 假定... languages​​.phpSESSION_LANGUAGE_KEY第17行
 

解决方案

在类中的常数定义，必须引用它作为自:: SESSION_LANGUAGE_KEY 代替

Please take a look at following code:

...
class LanguageResources {
    const SESSION_LANGUAGE_KEY = 'lang';

    public static function getLanguageSettingsFilePath() {

        if (isset($_GET[LanguageResources::SESSION_LANGUAGE_KEY])) {
....

I obtain an PHP error message for the very last line. What's wrong with array index access via constant value?

Notice: Use of undefined constant SESSION_LANGUAGE_KEY - assumed 'SESSION_LANGUAGE_KEY' in ...languages.php on line 17

解决方案

Inside the class that the constant was defined in, you must reference it as self::SESSION_LANGUAGE_KEY instead.

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