override_function

(PECL apd >= 0.2)

override_functionPasa por alto funciones integradas

Descripción

bool override_function ( string $function_name , string $function_args , string $function_code )

Pasa por alto funciones integradas al reemplazarlas en la tabla de símbolos.

Parámetros

function_name

La función para pasar por alto.

function_args

Los argumentos de la función, como una cadena separada por comas.

Usualmente se pasa este parámetro así como el parámetro function_code, como una sola cadena entre comillas simples. La razón para usar cadenas entre comillas simples es para proteger los nombres de variables del análisis sintáctico, de otra manera, si se utilizan comillas dobles sería necesario usar secuencias de escape en los nombres de las variables, como por ejemplo: \$your_var.

function_code

El nuevo código para la función.

Valores devueltos

Devuelve TRUE en caso de éxito o FALSE en caso de error.

Ejemplos

Ejemplo #1 override_function() ejemplo

<?php
override_function
('test''$a,$b''echo "DOING TEST"; return $a * $b;');
?>

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User Contributed Notes 4 notes

up
7
php at undeen dot com
9 years ago
I thought the example was not very helpful, because it doesn't even override the function with another function.
My question was: If I override a function, can I call the ORIGINAL function within the OVERRIDING function?
ie, can I do this:
<?php
override_function
('strlen', '$string', 'return override_strlen($string);');
function
override_strlen($string){
        return
strlen($string); 
}
?>
The answer: NO, you will get a segfault.

HOWEVER, if you use rename_function to rename the original function to a third name, then call the third name in the OVERRIDING function, you will get the desired effect:
<?php
rename_function
('strlen', 'new_strlen');
override_function('strlen', '$string', 'return override_strlen($string);');

function
override_strlen($string){
        return
new_strlen($string); 
}
?>

I plan to use this functionality to generate log reports every time a function is called, with the parameters, time, result, etc... So to wrap a function in logging, that was what I had to do.
up
0
Darien H
2 months ago
Please note that this function (as of v1.0.1 in PHP 5.3) will <b>not</b> override some important built-in "functions". Specifically, those which are actually statements/keywords, such as:

    require
    include
    require_once
    include_once
    echo
    print

I was hoping to use it to trace the chains of require/include activity among files in a large legacy project, but it seems APD will not do what I need.
up
0
rojaro at gmail dot com
8 years ago
Since Apache 1 & 2 use diffrent methods (Unicode vs. UTF8) on Win32 platforms to encode urls, i've implemented the following workaround to get around this "bug" (which is actually known behaviour and wont get fixed). This workaround is really usefull when writing PHP scripts which have to work on all platforms (Windows, Linux, BSD etc.), must process URLs and must work under both Apache versions.

<?php
$httpd
= explode(' ', $_SERVER['SERVER_SOFTWARE']);
if(
substr($httpd[0], 0, 6)=='Apache' && substr($httpd[0], 7, 1)==2 && $httpd[1]=='(Win32)')
{
  if(isset(
$_SERVER['REQUEST_URI'])) $_SERVER['REQUEST_URI'] = str_replace('%2F', '/', rawurlencode(utf8_decode(rawurldecode($_SERVER['REQUEST_URI']))));
  if(isset(
$_SERVER['REDIRECT_URL'])) $_SERVER['REDIRECT_URL'] = str_replace('%2F', '/', rawurlencode(utf8_decode(rawurldecode($_SERVER['REDIRECT_URL']))));
 
override_function('urlencode', '$url', 'return str_replace("%2F", "/", rawurlencode(utf8_encode($url)));');
}
?>
up
-1
pagan at o2 dot pl
5 years ago
There is not chance to override 2 or more functions, because of the error:
Fatal error: Cannot redeclare __overridden__()
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