(PECL uopz >= 1.0.0)
uopz_undefine — Undefine a constant
$class
, string $constant
)$constant
)Removes the constant at runtime
class
The name of the class containing constant
constantThe name of an existing constant
Example #1 uopz_undefine() example
<?php
define("MY", true);
uopz_undefine("MY");
var_dump(defined("MY"));
?>
以上例程的输出类似于：
bool(false)