PHP中的动态常量名称 [英] Dynamic constant name in PHP

问题描述

我试图动态创建一个常量名称，然后获取该值.

I am trying to create a constant name dynamically and then get at the value.

define( CONSTANT_1 , "Some value" ) ;

// try to use it dynamically ...
$constant_number = 1 ;
$constant_name = ("CONSTANT_" . $constant_number) ;

// try to assign the constant value to a variable...
$constant_value = $constant_name;

但是我发现$ constant值仍然包含常量的NAME，而不是VALUE.

But I find that $constant value still contains the NAME of the constant, and not the VALUE.

我也尝试了第二级间接寻址$$constant_name，但这会使它成为变量而不是常量.

I tried the second level of indirection as well $$constant_name But that would make it a variable not a constant.

有人可以对此有所启发吗?

Can somebody throw some light on this?

推荐答案

http: //dk.php.net/manual/zh/function.constant.php

echo constant($constant_name);

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