ScotlandPHP

Surcharge magique

La surcharge magique en PHP permet de "créer" dynamiquement des propriétés et des méthodes. Ces entités dynamiques sont traitées via des méthodes magiques établies que l'on peut positionner dans une classe pour divers types d'actions.

Les méthodes magiques de surcharge sont appelées lors de l'interaction avec des propriétés ou des méthodes qui n'ont pas été déclarées ou ne sont pas visibles dans le contexte courant. Le reste de cette section utilise les termes de "propriétés inaccessibles" et de "méthodes inaccessibles" pour se référer à cette combinaison de déclaration et de visibilité.

Toutes les méthodes magiques de surcharge doivent être définies comme public.

Note:

Aucun des arguments de ces méthodes magiques ne peut être passé par référence.

Note:

L'interprétation PHP de la "surcharge" est différente de celle de la plupart des langages orientés objet. La surcharge, habituellement, fournit la possibilité d'avoir plusieurs méthodes portant le même nom mais avec une quantité et des types différents d'arguments.

Historique

Version Description
5.3.0 Ajout de __callStatic(). Ajout d'un avertissement pour forcer la visibilité public et la déclaration non static.
5.1.0 Ajout de __isset() et de __unset(). Ajout du support de la surcharge des propriétés privées pour __get().
5.0.0 Ajout de __get().

Surcharge de propriétés

public void __set ( string $name , mixed $value )
public mixed __get ( string $name )
public bool __isset ( string $name )
public void __unset ( string $name )

__set() est sollicitée lors de l'écriture de données vers des propriétés inaccessibles.

__get() est appelée pour lire des données depuis des propriétés inaccessibles.

__isset() est sollicitée lorsque isset() ou la fonction empty() sont appelées sur des propriétés inaccessibles.

__unset() est invoquée lorsque unset() est appelée sur des propriétés inaccessibles.

L'argument $name est le nom de la propriété avec laquelle on interagit. L'argument $value de la méthode __set() spécifie la valeur à laquelle la propriété $name devrait être définie.

La surcharge de propriétés ne fonctionne que dans les contextes objets. Ces méthodes magiques ne seront pas lancées en contexte statique. Par conséquent, ces méthodes ne devraient pas être déclarées comme statiques. Depuis PHP 5.3.0, un avertissement est levée si une des méthodes magiques est déclarée comme statique.

Note:

La valeur retournée par __set() est ignorée en raison de la façon dont PHP traite l'opérateur d'affectation. De la même façon, __get() n'est jamais appelée lors d'un enchaînement d'assignements, comme ceci :

 $a = $obj->b = 8; 

Exemple #1 Exemple de surcharge de propriétés avec les méthodes __get(), __set(), __isset() et __unset()

<?php
class PropertyTest
{
    
/**  Variable pour les données surchargées.  */
    
private $data = array();

    
/**  La surcharge n'est pas utilisée sur les propriétés déclarées.  */
    
public $declared 1;

    
/**  La surcharge n'est lancée que lorsque l'on accède à cette propriété depuis l'extérieur de la classe.  */
    
private $hidden 2;

    public function 
__set($name$value)
    {
        echo 
"Définition de '$name' à la valeur '$value'\n";
        
$this->data[$name] = $value;
    }

    public function 
__get($name)
    {
        echo 
"Récupération de '$name'\n";
        if (
array_key_exists($name$this->data)) {
            return 
$this->data[$name];
        }

        
$trace debug_backtrace();
        
trigger_error(
            
'Propriété non-définie via __get() : ' $name .
            
' dans ' $trace[0]['file'] .
            
' à la ligne ' $trace[0]['line'],
            
E_USER_NOTICE);
        return 
null;
    }

    
/**  Depuis PHP 5.1.0  */
    
public function __isset($name)
    {
        echo 
"Est-ce que '$name' est défini ?\n";
        return isset(
$this->data[$name]);
    }

    
/**  Depuis PHP 5.1.0  */
    
public function __unset($name)
    {
        echo 
"Effacement de '$name'\n";
        unset(
$this->data[$name]);
    }

    
/**  Ce n'est pas une méthode magique, nécessaire ici que pour l'exemple.  */
    
public function getHidden()
    {
        return 
$this->hidden;
    }
}


echo 
"<pre>\n";

$obj = new PropertyTest;

$obj->1;
echo 
$obj->"\n\n";

var_dump(isset($obj->a));
unset(
$obj->a);
var_dump(isset($obj->a));
echo 
"\n";

echo 
$obj->declared "\n\n";

echo 
"Manipulons maintenant la propriété privée nommée 'hidden' :\n";
echo 
"'hidden' est visible depuis la classe, donc __get() n'est pas utilisée...\n";
echo 
$obj->getHidden() . "\n";
echo 
"'hidden' n'est pas visible en dehors de la classe, donc __get() est utilisée...\n";
echo 
$obj->hidden "\n";
?>

L'exemple ci-dessus va afficher :

Définition de 'a' à '1'
Récupération de 'a'
1

Est-ce que 'a' est défini ?
bool(true)
Effacement de 'a'
Est-ce que 'a' est défini ?
bool(false)

1

Manipulons maintenant la propriété privée nommée 'hidden' :
'hidden' est visible depuis la classe, donc __get() n'est pas utilisée...
2
'hidden' n'est pas visible en dehors de la classe, donc __get() est utilisée...
Récupération de 'hidden'


Notice: Propriété non-définie via __get() : hidden dans <file> à la ligne 64 dans <file> à la ligne 28

Surcharge de méthodes

public mixed __call ( string $name , array $arguments )
public static mixed __callStatic ( string $name , array $arguments )

__call() est appelée lorsque l'on invoque des méthodes inaccessibles dans un contexte objet.

__callStatic() est lancée lorsque l'on invoque des méthodes inaccessibles dans un contexte statique.

L'argument $name est le nom de la méthode appelée. L'argument $arguments est un tableau contenant les paramètres passés à la méthode $name.

Exemple #2 Surcharge de méthodes avec __call() et __callStatic()

<?php
class MethodTest
{
    public function 
__call($name$arguments)
    {
        
// Note : la valeur de $name est sensible à la casse.
        
echo "Appel de la méthode '$name' "
             
implode(', '$arguments). "\n";
    }

    
/**  Depuis PHP 5.3.0  */
    
public static function __callStatic($name$arguments)
    {
        
// Note : la valeur de $name est sensible à la casse.
        
echo "Appel de la méthode statique '$name' "
             
implode(', '$arguments). "\n";
    }
}

$obj = new MethodTest;
$obj->runTest('dans un contexte objet');

MethodTest::runTest('dans un contexte static');  // Depuis PHP 5.3.0
?>

L'exemple ci-dessus va afficher :

Appel de la méthode 'runTest' dans un contexte objet
Appel de la méthode statique 'runTest' dans un contexte static
add a note add a note

User Contributed Notes 57 notes

up
873
php_is_painful at world dot real
10 years ago
This is a misuse of the term overloading. This article should call this technique "interpreter hooks".
up
148
theaceofthespade at gmail dot com
5 years ago
A word of warning!  It may seem obvious, but remember, when deciding whether to use __get, __set, and __call as a way to access the data in your class (as opposed to hard-coding getters and setters), keep in mind that this will prevent any sort of autocomplete, highlighting, or documentation that your ide mite do.

Furthermore, it beyond personal preference when working with other people.  Even without an ide, it can be much easier to go through and look at hardcoded member and method definitions in code, than having to sift through code and piece together the method/member names that are assembled in __get and __set.

If you still decide to use __get and __set for everything in your class, be sure to include detailed comments and documenting, so that the people you are working with (or the people who inherit the code from you at a later date) don't have to waste time interpreting your code just to be able to use it.
up
31
pogregoire##live.fr
1 year ago
It is important to understand that encapsulation can be very easily violated in PHP. for example :
class Object{

}

$Object = new Object();
$Objet->barbarianProperties  = 'boom';

var_dump($Objet);// object(Objet)#1 (1) { ["barbarianProperties"]=> string(7) "boom" }

Hence it is possible to add a propertie out form the class definition.
It is then a necessity in order to protect encapsulation to introduce __set() in the class :

class Objet{
    public function __set($name,$value){
        throw new Exception ('no');
    }
}
up
48
Anonymous
1 year ago
First off all, if you read this, please upvote the first comment on this list that states that “overloading” is a bad term for this behaviour. Because it REALLY is a bad name. You’re giving new definition to an already accepted IT-branch terminology.

Second, I concur with all criticism you will read about this functionality. Just as naming it “overloading”, the functionality is also very bad practice. Please don’t use this in a production environment. To be honest, avoid to use it at all. Especially if you are a beginner at PHP. It can make your code react very unexpectedly. In which case you MIGHT be learning invalid coding!

And last, because of __get, __set and __call the following code executes. Which is abnormal behaviour. And can cause a lot of problems/bugs.

<?php

class BadPractice {
 
// Two real properties
 
public $DontAllowVariableNameWithTypos = true;
  protected
$Number = 0;
 
// One private method
 
private function veryPrivateMethod() { }
 
// And three very magic methods that will make everything look inconsistent
  // with all you have ever learned about PHP.
 
public function __get($n) {}
  public function
__set($n, $v) {}
  public function
__call($n, $v) {}
}

// Let's see our BadPractice in a production environment!
$UnexpectedBehaviour = new BadPractice;

// No syntax highlighting on most IDE's
$UnexpectedBehaviour->SynTaxHighlighting = false;

// No autocompletion on most IDE's
$UnexpectedBehaviour->AutoCompletion = false;

// Which will lead to problems waiting to happen
$UnexpectedBehaviour->DontAllowVariableNameWithTyphos = false; // see if below

// Get, Set and Call anything you want!
$UnexpectedBehaviour->EveryPosibleMethodCallAllowed(true, 'Why Not?');

// And sure, why not use the most illegal property names you can think off
$UnexpectedBehaviour->{'100%Illegal+Names'} = 'allowed';

// This Very confusing syntax seems to allow access to $Number but because of
// the lowered visibility it goes to __set()
$UnexpectedBehaviour->Number = 10;

// We can SEEM to increment it too! (that's really dynamic! :-) NULL++ LMAO
$UnexpectedBehaviour->Number++;

// this ofcourse outputs NULL (through __get) and not the PERHAPS expected 11
var_dump($UnexpectedBehaviour->Number);

// and sure, private method calls LOOK valid now!
// (this goes to __call, so no fatal error)
$UnexpectedBehaviour->veryPrivateMethod();

// Because the previous was __set to false, next expression is true
// if we didn't had __set, the previous assignment would have failed
// then you would have corrected the typho and this code will not have
// been executed. (This can really be a BIG PAIN)
if ($UnexpectedBehaviour->DontAllowVariableNameWithTypos) {
 
// if this code block would have deleted a file, or do a deletion on
  // a database, you could really be VERY SAD for a long time!
 
$UnexpectedBehaviour->executeStuffYouDontWantHere(true);
}
?>
up
62
egingell at sisna dot com
10 years ago
Small vocabulary note: This is *not* "overloading", this is "overriding".

Overloading: Declaring a function multiple times with a different set of parameters like this:
<?php

function foo($a) {
    return
$a;
}

function
foo($a, $b) {
    return
$a + $b;
}

echo
foo(5); // Prints "5"
echo foo(5, 2); // Prints "7"

?>

Overriding: Replacing the parent class's method(s) with a new method by redeclaring it like this:
<?php

class foo {
    function new(
$args) {
       
// Do something.
   
}
}

class
bar extends foo {
    function new(
$args) {
       
// Do something different.
   
}
}

?>
up
30
Anonymous
2 years ago
Using magic methods, especially __get(), __set(), and __call() will effectively disable autocomplete in most IDEs (eg.: IntelliSense) for the affected classes.

To overcome this inconvenience, use phpDoc to let the IDE know about these magic methods and properties: @method, @property, @property-read, @property-write.

/**
* @property-read name
* @property-read price
*/
class MyClass
{
    private $properties = array('name' => 'IceFruit', 'price' => 2.49)
   
    public function __get($name)
    {
        return $this->properties($name);
    }
}
up
5
Ant P.
8 years ago
Be extra careful when using __call():  if you typo a function call somewhere it won't trigger an undefined function error, but get passed to __call() instead, possibly causing all sorts of bizarre side effects.
In versions before 5.3 without __callStatic, static calls to nonexistent functions also fall through to __call!
This caused me hours of confusion, hopefully this comment will save someone else from the same.
up
12
alexandre at nospam dot gaigalas dot net
10 years ago
PHP 5.2.1

Its possible to call magic methods with invalid names using variable method/property names:

<?php

class foo
{
    function
__get($n)
    {
       
print_r($n);
    }
    function
__call($m, $a)
    {
       
print_r($m);
    }
}

$test = new foo;
$varname = 'invalid,variable+name';
$test->$varname;
$test->$varname();

?>

I just don't know if it is a bug or a feature :)
up
18
jan dot machala at email dot cz
6 years ago
Example of usage __call() to have implicit getters and setters

<?php
class Entity {
    public function
__call($methodName, $args) {
        if (
preg_match('~^(set|get)([A-Z])(.*)$~', $methodName, $matches)) {
           
$property = strtolower($matches[2]) . $matches[3];
            if (!
property_exists($this, $property)) {
                throw new
MemberAccessException('Property ' . $property . ' not exists');
            }
            switch(
$matches[1]) {
                case
'set':
                   
$this->checkArguments($args, 1, 1, $methodName);
                    return
$this->set($property, $args[0]);
                case
'get':
                   
$this->checkArguments($args, 0, 0, $methodName);
                    return
$this->get($property);
                case
'default':
                    throw new
MemberAccessException('Method ' . $methodName . ' not exists');
            }
        }
    }

    public function
get($property) {
        return
$this->$property;
    }

    public function
set($property, $value) {
       
$this->$property = $value;
        return
$this;
    }

    protected function
checkArguments(array $args, $min, $max, $methodName) {
       
$argc = count($args);
        if (
$argc < $min || $argc > $max) {
            throw new
MemberAccessException('Method ' . $methodName . ' needs minimaly ' . $min . ' and maximaly ' . $max . ' arguments. ' . $argc . ' arguments given.');
        }
    }
}

class
MemberAccessException extends Exception{}

class
Foo extends Entity {
    protected
$a;
}

$foo = new Foo();
$foo->setA('some'); // outputs some
echo $foo->getA();

class
Bar extends Entity {
    protected
$a;
   
/**
     * Custom setter.
     */
   
public function setA($a) {
        if (!
preg_match('~^[0-9a-z]+$~i', $a)) {
            throw new
MemberAccessException('A can be only alphanumerical');
        }
       
$this->a = $a;
        return
$this;
    }
}

$bar = new Bar();
$bar->setA('abc123'); // ok
$bar->setA('[]/*@...'); // throws exception
?>
up
5
PHP at jyopp dotKomm
11 years ago
Here's a useful class for logging function calls.  It stores a sequence of calls and arguments which can then be applied to objects later.  This can be used to script common sequences of operations, or to make "pluggable" operation sequences in header files that can be replayed on objects later.

If it is instantiated with an object to shadow, it behaves as a mediator and executes the calls on this object as they come in, passing back the values from the execution.

This is a very general implementation; it should be changed if error codes or exceptions need to be handled during the Replay process.
<?php
class MethodCallLog {
    private
$callLog = array();
    private
$object;
   
    public function
__construct($object = null) {
       
$this->object = $object;
    }
    public function
__call($m, $a) {
       
$this->callLog[] = array($m, $a);
        if (
$this->object) return call_user_func_array(array(&$this->object,$m),$a);
        return
true;
    }
    public function
Replay(&$object) {
        foreach (
$this->callLog as $c) {
           
call_user_func_array(array(&$object,$c[0]), $c[1]);
        }
    }
    public function
GetEntries() {
       
$rVal = array();
        foreach (
$this->callLog as $c) {
           
$rVal[] = "$c[0](".implode(', ', $c[1]).");";
        }
        return
$rVal;
    }
    public function
Clear() {
       
$this->callLog = array();
    }
}

$log = new MethodCallLog();
$log->Method1();
$log->Method2("Value");
$log->Method1($a, $b, $c);
// Execute these method calls on a set of objects...
foreach ($array as $o) $log->Replay($o);
?>
up
22
navarr at gtaero dot net
7 years ago
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