php - How to access a constant from within a class method -

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i'm migrating php application procedural oop.
use debug constant activate errors , warnings output (in fact, have thee, every 1 makes output more verbose.
can't find way access constants within method.
constants defined before autoload in separate file.

in utility file have

define('debug', true);

and inside given method tried 

if(!defined('debug')) define('debug', false);

but end debug=false.
doing wrong? i'm total noob oop, gentle please :-)

clarification

every class has own file.
in given script, first thing include utility file. utility file 1 defines debug , has _autoload function.

script_file.php  includes utility_file.php   defines debug   has _autoload function

according this, should access debug (no prepending $) in code directly. including or requiring utility file in same file has function you're talking about? don't think oop problem


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