PHP defined not working?

Question

I have a config file that I include early in my program and set this

define('BASE_SLUG','/shop');

I include another file later with these lines

echo BASE_SLUG;
if (defined(BASE_SLUG)) {
  echo ' - yes';
} else {
  echo ' - no';
}

And my output is

/shop - no

how is this possible? BASE_SLUG has the value of /shop and I can echo it, but one line later it says it is not defined

if (defined(BASE_SLUG)) = if (defined('/shop')) which is not defined. — bansi
– bansi, Commented Jul 18, 2014 at 4:20

Community · Accepted Answer · 2023-11-17 20:33:26Z

24

Here is the function prototype for defined

bool defined ( string $name )

You can see that it expects a string value for a constant name. Yours isn't a valid string.

if (defined(BASE_SLUG)) {

Should have the name of constant inside quotes, like :

if (defined('BASE_SLUG')) {

Read this note from PHP Manual

<?php
/* 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;
}
?>

Source

edited Nov 17, 2023 at 20:33

CommunityBot

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answered Jul 18, 2014 at 4:17

Hanky Panky

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