Undefine a constant
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    uopz_undefine

    (PECL uopz 1, PECL uopz 2, PECL uopz 5, PECL uopz 6, PECL uopz 7)

    uopz_undefine — Undefine a constant

    Description

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

    Removes the constant at runtime

    Parameters

    class

    The name of the class containing constant

    constant

    The name of an existing constant

    Return Values

    Returns true on success or false on failure.

    Examples

    Example #1 uopz_undefine() example

    <?phpdefine("MY", true);uopz_undefine("MY");var_dump(defined("MY"));?>

    The above example will output:

    bool(false)