constant already defined in php

Question

I have a function that I am trying to run but it shows the message as CONSTANT already defined.

I tried to put a condition saying "if defined" about the function but still nothing. Is there any method to ignore this and see the output?

Answer 1

Replace this:

define('constant', 'value'); 

with this:

if (!defined('constant')) define('constant', 'value'); 

Answer 2

define()

Example:

/* Note the use of quotes, this is important.  This example is checking  * if the string 'TEST' is the name of a constant named TEST */ if (defined('TEST')) {     echo TEST; }