PHP 7.1.0 Released

runkit_function_redefine

(PECL runkit >= 0.7.0)

runkit_function_redefine Replace a function definition with a new implementation

Description

bool runkit_function_redefine ( string $funcname , string $arglist , string $code [, bool $return_by_reference = NULL [, string $doc_comment = NULL ]] )

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

funcname

Name of function to redefine

arglist

New list of arguments to be accepted by function

code

New code implementation

return_by_reference

Whether the function should return by reference.

doc_comment

The doc comment of the function.

Return Values

Returns TRUE on success or FALSE on failure.

Changelog

Version Description
runkit 1.0.4 The optional parameters return_by_reference and doc_comment have been added.

Examples

Example #1 A runkit_function_redefine() example

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

The above example will output:

Original Testme Implementation
New Testme Implementation

See Also

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User Contributed Notes 2 notes

up
11
lucato at gmail dot com
4 years ago
Note to users: language constructs (eval, die, exit, isset, unset, echo etc.) which might be confused with functions, cannot be renamed or redefined even with runkit.internal_override.
up
5
corentin dot delorme at linagora dot com
9 years ago
Here is another example with a parameter:

<?php

function hello_world($word) {
  echo
"Original Hello World: $word\n</br>";
}

$helloWorld = 'echo "Redefined Hello World: $word\n</br>";';

hello_world('test1');

runkit_function_redefine('hello_world', '$word', $helloWorld);

hello_world('test2');

?>
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