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(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
示例 #1 uopz_undefine() example
<?php
define("MY", true);
uopz_undefine("MY");
var_dump(defined("MY"));
?>
以上示例会输出:
bool(false)