Replace a function definition with a new implementation

# runkit7_function_redefine

(PECL runkit7 >= Unknown)

runkit7_function_redefine — Replace a function definition with a new implementation

### 说明

function runkit7_function_redefine(
string `$function_name`,
string `$argument_list`,
string `$code`,
bool `$return_by_reference` = `null`,
string `$doc_comment` = `null`,
string `$return_type` = ?,
bool `$is_strict` = ?
): bool
function runkit7_function_redefine(
string `$function_name`,
Closure `$closure`,
string `$doc_comment` = `null`,
string `$return_type` = ?,
bool `$is_strict` = ?
): bool

> 注意: 默认情况下，仅在用户空间可删除，重命名，或者修改函数。为了覆盖内部函数，必须启用 php.ini 中的 `runkit.internal_override` 设置。

### 参数

`function_name`
  Name of function to redefine
`argument_list`
  New list of arguments to be accepted by function
`code`
  New code implementation
`closure`
  A closure that defines the function.
`return_by_reference`
  Whether the function should return by reference.
`doc_comment`
  The doc comment of the function.
`return_type`
  The return type of the function.
`is_strict`
  Whether the function behaves as if it was declared in a file with `strict_types=1`

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 示例

示例 #1 A runkit7_function_redefine() example

    <?php
    function testme() {
      echo "Original Testme Implementation\n";
    }
    testme();
    runkit7_function_redefine('testme','','echo "New Testme Implementation\n";');
    testme();
    ?>

以上示例会输出：

    Original Testme Implementation
    New Testme Implementation

### 参见

- runkit7_function_add() - Add a new function, similar to create_function
- runkit7_function_copy() - Copy a function to a new function name
- runkit7_function_rename() - Change a function's name
- runkit7_function_remove() - Remove a function definition
- runkit7_method_redefine() - Dynamically changes the code of the given method

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