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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

© 1997–2025 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.runkit7-function-redefine.php