Uopz 函数
PHP Manual

uopz_undefine

(PECL uopz >= 1.0.0)

uopz_undefineUndefine a constant

说明

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

范例

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)

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Uopz 函数
PHP Manual