常量的字符串连接 [英] string concatenation with constants

问题描述

当前的托管服务商仅提供PHP 5.4，并且在代码中始终会出现类常量错误.显然，不允许定义数组常量.我将常量更改为静态变量以使其正常工作.现在，我收到此语法错误:

I have only PHP 5.4 available at my current hoster and I always get errors with class constants in my code. Apparently, it's not allowed to define array constants. I changed the constant to a static variable to make it work. Now I get this syntax error:

    syntax error, unexpected '.', expecting ']'

我尝试定义由串联常量组成的字符串.

I try to define strings that consist of concatenated constants.

public static $arr = [KEY_ONE => "string " . MyClass::CONSTANT . " string"]

这是否可能，或者现在所有常量都必须是静态变量吗?

is this possible or do all constants have to be static variables now?

推荐答案

在变量声明中，您无法执行操作.既不是串联运算，也不是数学运算.

In the variable declaration you cannot do operations. Neither concatenation nor math operations.

您可以通过构造方法来完成；

You can do it in construct method;

public static $arr = [];

public function __construct(){
  self::$arr = [KEY_ONE => "string " . MyClass::CONSTANT . " string"];
}

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