(PECL uopz 1, PECL uopz 2, PECL uopz 5)
uopz_undefine — Undefine a constant
$constant
)$class
, string $constant
)Removes the constant at runtime
class
The name of the class containing constant
constantThe name of an existing constant
Returns TRUE on success or FALSE on failure.
Example #1 uopz_undefine() example
<?php
define("MY", true);
uopz_undefine("MY");
var_dump(defined("MY"));
?>
The above example will output:
bool(false)