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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PECL uopz >= 1.0.0)
uopz_undefine — Undefine a constant
$class
, string $constant
)$constant
)Removes the constant at runtime
class
The name of the class containing constant
constant
The name of an existing constant
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)