uopz_undefine
(PECL uopz 1, PECL uopz 2, PECL uopz 5, PECL uopz 6, PECL uopz 7)
uopz_undefine — Undefine a constant
说明
uopz_undefine(string
$constant
): booluopz_undefine(string
$class
, string $constant
): boolRemoves the constant at runtime
参数
-
class
-
The name of the class containing
constant
-
constant
-
The name of an existing constant
返回值
成功时返回 true
, 或者在失败时返回 false
。
范例
示例 #1 uopz_undefine() example
<?php
define("MY", true);
uopz_undefine("MY");
var_dump(defined("MY"));
?>
以上例程会输出:
bool(false)
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