PHP uses dynamic constant and define values _php tutorials

In PHP constant and define are constants then I would like to introduce a method to achieve dynamic use of constant and define value method, I hope you have some help.

How do you use PHP to show or use dynamic Constant/define values? Ex: The following example is a dynamic variable, but how is dynamic Constant used?

The code is as follows	Copy Code
$a = ' abc '; $b = ' a '; echo $ $b; Print out ABC ?>

PHP uses dynamic constant/define values
You can use constant () to achieve a value using constant, as shown in the following example:

The code is as follows	Copy Code
Define (' PKEY1 ', ' abc '); Define (' PKEY2 ', ' def '); $i = 1; $a = ' PKEY '; ECHO constant ($a. $i); Abc ECHO constant ($a. + + $i); Def ?>

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