uopz_undefine

(PECL uopz 1, PECL uopz 2, PECL uopz 5, PECL uopz 6)

uopz_undefineUndefine a constant

说明

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

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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