Get User Defined Constants in PHP

PHP function - get_defined_constants()  gives all the constants defined in current scope.  It can be CORE Constants, extensions defined constants and user defined constants. As a developer you may be interested in all defined constants or user defined constants at a time. As the total number of constants printed on screen can be very high, you may like to print the concerned constants at a time.

For user defined constants:

<?php
$const = get_defined_constants(true);
print_r($const['user']);
?>

For Core Constant, user 'Core' as keyword -
print_r($const['Core']).

For checking all values in the function, just print it as see what is stored within it.

The categorize parameter to get_defined_constants() was added in PHP 5.

• Get Defined Variables in Current Scope
• PHP array – Common Usage
• php.ini – PHP configuration file