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uopz_undefine

(PECL uopz 1, PECL uopz 2, PECL uopz 5)

uopz_undefineUndefine a constant

说明

bool uopz_undefine ( string $constant )
bool uopz_undefine ( string $class , string $constant )

Removes 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

Example #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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