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runkit7_constant_remove

(PECL runkit7 >= Unknown)

runkit7_constant_remove — Remove/Delete an already defined constant

runkit7_constant_remove(string $constant_name): bool

constant_name: Name of the constant to remove. Either the name of a global constant, or classname::constname indicating a class constant.

成功时返回 true，或者在失败时返回 false。

define() - 定义一个常量
runkit7_constant_add() - Similar to define(), but allows defining in class definitions as well
runkit7_constant_redefine() - Redefine an already defined constant

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