PHP uses dynamic Constant and Define values

Source: Internet
Author: User
Tags constant

How should I use PHP to show or use dynamic Constant/Define values? Ex: The following example shows dynamic variables, but how do I use dynamic Constant?

The code is as follows: Copy code

<? Php
$ A = 'abc ';
$ B = 'a ';
Echo $ B; // Print abc

PHP uses dynamic Constant/Define values
You can use constant () to achieve the value of using Constant. The example is as follows:

The code is as follows: Copy code

<? Php
Define ('pkey1', 'ABC ');
Define ('pkey2', 'Def ');
$ I = 1;
$ A = 'pkey ';
Echo constant ($ a. $ I); // abc
Echo constant ($ a. ++ $ I); // def

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