Remove/Delete an already defined constant

# runkit7_constant_remove

(PECL runkit7 >= Unknown)

runkit7_constant_remove — Remove/Delete an already defined constant

### 说明

function runkit7_constant_remove(string `$constant_name`): bool

### 参数

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

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 参见

- 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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