(PECL uopz 1, PECL uopz 2, PECL uopz 5, PECL uopz 6, PECL uopz 7)
uopz_undefine — Undefine a constant
Removes the constant at runtime
class
The name of the class containing constant
constant
The name of an existing constant
Example #1 uopz_undefine() example
<?phpdefine("MY", true);uopz_undefine("MY");var_dump(defined("MY"));?>
The above example will output:
bool(false)