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

### Description

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

> Note: By default, only userspace functions may be removed, renamed, or modified. In order to override internal functions, you must enable the `runkit.internal_override` setting in php.ini.

### Parameters

`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`

### Return Values

Returns `true` on success or `false` on failure.

### Examples

Example #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();
?>`

The above example will output:

    Original Testme Implementation
    New Testme Implementation

### See Also

- 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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