runkit_constant_redefine

(PECL runkit >= 0.7.0)

runkit_constant_redefine — Redefine an already defined constant

runkit_constant_redefine ( string $constname , mixed $newvalue ) : bool

constname: Constant to redefine. Either string indicating global constant, or classname::constname indicating class constant.
newvalue: New value to assign to constant.

成功时返回 TRUE，或者在失败时返回 FALSE。

runkit_constant_add() - Similar to define(), but allows defining in class definitions as well
runkit_constant_remove() - Remove/Delete an already defined constant

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