(PECL uopz 1, PECL uopz 2, PECL uopz 5, PECL uopz 6)
uopz_undefine — Undefine a constant
uopz_undefine ( string $constant ) : bool
uopz_undefine ( string $class , string $constant ) : bool
Removes the constant at runtime
class
The name of the class containing constant
constant
The name of an existing constant
Returns true on success or false on failure.
Example #1 uopz_undefine() example
<?php
define("MY", true);
uopz_undefine("MY");
var_dump(defined("MY"));
?> The above example will output:
bool(false)
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https://www.php.net/manual/en/function.uopz-undefine.php