uopz_undefine

(PECL uopz 1, PECL uopz 2, PECL uopz 5, PECL uopz 6, PECL uopz 7)

uopz_undefine — Undefine a constant

Description

uopz_undefine(string $constant): bool
uopz_undefine(string $class, string $constant): bool

Removes the constant at runtime

Parameters

class

The name of the class containing constant

constant

The name of an existing constant

Return Values

Returns true on success or false on failure.

Examples

Example #1 uopz_undefine() example

<?php
define("MY", true);

uopz_undefine("MY");

var_dump(defined("MY"));
?>

The above example will output:

bool(false)