Below three examples describe anonymous class with very simple and basic but quite understandable example
<?php
// First way - anonymous class assigned directly to variable
$ano_class_obj = new class{
public $prop1 = 'hello';
public $prop2 = 754;
const SETT = 'some config';
public function getValue()
{
// do some operation
return 'some returned value';
}
public function getValueWithArgu($str)
{
// do some operation
return 'returned value is '.$str;
}
};
echo "\n";
var_dump($ano_class_obj);
echo "\n";
echo $ano_class_obj->prop1;
echo "\n";
echo $ano_class_obj->prop2;
echo "\n";
echo $ano_class_obj::SETT;
echo "\n";
echo $ano_class_obj->getValue();
echo "\n";
echo $ano_class_obj->getValueWithArgu('OOP');
echo "\n";
echo "\n";
// Second way - anonymous class assigned to variable via defined function
$ano_class_obj_with_func = ano_func();
function ano_func()
{
return new class {
public $prop1 = 'hello';
public $prop2 = 754;
const SETT = 'some config';
public function getValue()
{
// do some operation
return 'some returned value';
}
public function getValueWithArgu($str)
{
// do some operation
return 'returned value is '.$str;
}
};
}
echo "\n";
var_dump($ano_class_obj_with_func);
echo "\n";
echo $ano_class_obj_with_func->prop1;
echo "\n";
echo $ano_class_obj_with_func->prop2;
echo "\n";
echo $ano_class_obj_with_func::SETT;
echo "\n";
echo $ano_class_obj_with_func->getValue();
echo "\n";
echo $ano_class_obj_with_func->getValueWithArgu('OOP');
echo "\n";
echo "\n";
// Third way - passing argument to anonymous class via constructors
$arg = 1; // we got it by some operation
$config = [2, false]; // we got it by some operation
$ano_class_obj_with_arg = ano_func_with_arg($arg, $config);
function ano_func_with_arg($arg, $config)
{
return new class($arg, $config) {
public $prop1 = 'hello';
public $prop2 = 754;
public $prop3, $config;
const SETT = 'some config';
public function __construct($arg, $config)
{
$this->prop3 = $arg;
$this->config =$config;
}
public function getValue()
{
// do some operation
return 'some returned value';
}
public function getValueWithArgu($str)
{
// do some operation
return 'returned value is '.$str;
}
};
}
echo "\n";
var_dump($ano_class_obj_with_arg);
echo "\n";
echo $ano_class_obj_with_arg->prop1;
echo "\n";
echo $ano_class_obj_with_arg->prop2;
echo "\n";
echo $ano_class_obj_with_arg::SETT;
echo "\n";
echo $ano_class_obj_with_arg->getValue();
echo "\n";
echo $ano_class_obj_with_arg->getValueWithArgu('OOP');
echo "\n";
echo "\n";
Classes anonymes
Les classes anonymes sont utiles lorsque de simples objets uniques ont besoin d'être créés.
<?php
// Utilisant une classe explicite
class Logger
{
public function log($msg)
{
echo $msg;
}
}
$util->setLogger(new Logger());
// Utilisant une classe anonyme
$util->setLogger(new class {
public function log($msg)
{
echo $msg;
}
});On peut leur passer des arguments via le constructeur, elles peuvent étendre d'autres classes, implémenter des interfaces ou utiliser des traits comme avec une classe normale.
<?php
class SomeClass {}
interface SomeInterface {}
trait SomeTrait {}
var_dump(new class(10) extends SomeClass implements SomeInterface {
private $num;
public function __construct($num)
{
$this->num = $num;
}
use SomeTrait;
});L'exemple ci-dessus va afficher :
object(class@anonymous)#1 (1) {
["Command line code0x104c5b612":"class@anonymous":private]=>
int(10)
}
Imbriquer une classe anonyme à l'intérieur d'une autre classe ne donne pas accès aux méthodes ou propriétés privées ou protégées de la classe contenante. Afin d'utiliser des méthodes ou propriétés protégées de la classe contenante, la classe anonyme doit étendre celle ci. Pour utiliser les propriétés privées de la classe contenant dans la classe anonyme, celles ci doivent être passées via le constructeur.
<?php
class Outer
{
private $prop = 1;
protected $prop2 = 2;
protected function func1()
{
return 3;
}
public function func2()
{
return new class($this->prop) extends Outer {
private $prop3;
public function __construct($prop)
{
$this->prop3 = $prop;
}
public function func3()
{
return $this->prop2 + $this->prop3 + $this->func1();
}
};
}
}
echo (new Outer)->func2()->func3();L'exemple ci-dessus va afficher :
6
Tous les objets créés par la même déclaration de classe anonyme sont des instances de cette même classe.
<?php
function anonymous_class()
{
return new class {};
}
if (get_class(anonymous_class()) === get_class(anonymous_class())) {
echo 'same class';
} else {
echo 'different class';
}L'exemple ci-dessus va afficher :
same class
Note:
Notez que les classes anonymes sont affectées d'un nom par le moteur, comme l'illustre l'exemple suivant. Ce nom doit être considéré comme un détail de mise en œuvre, qui ne doit pas être invoqué.
<?php
echo get_class(new class {});Résultat de l'exemple ci-dessus est similaire à :
class@anonymous/in/oNi1A0x7f8636ad2021
add a note
User Contributed Notes 9 notes
Anonymous ¶
8 years ago
ytubeshareit at gmail dot com ¶
7 years ago
Anonymous classes are syntax sugar that may appear deceiving to some.
The 'anonymous' class is still parsed into the global scope, where it is auto assigned a name, and every time the class is needed, that global class definition is used. Example to illustrate....
The anonymous class version...
<?php
function return_anon(){
return new class{
public static $str="foo";
};
}
$test=return_anon();
echo $test::$str; //ouputs foo
//we can still access the 'anon' class directly in the global scope!
$another=get_class($test); //get the auto assigned name
echo $another::$str; //outputs foo
?>
The above is functionally the same as doing this....
<?php
class I_named_this_one{
public static $str="foo";
}
function return_not_anon(){
return 'I_named_this_one';
}
$clzz=return_not_anon();//get class name
echo $clzz::$str;
?>
joey ¶
5 years ago
The only way to type hint this would appear to be as object.
If you need multiple instances of an anonymous class in a function you can use:
$class = function(string $arg):object {
return new class($arg) {
public function __construct(string $arg) {
$this->ow = $arg;
}
};
};
Though for the sake of structure it's ill advised to do something like this outside of a single scope or that's used across multiple files. If you class is only used in one scope however then it's probably not a code mess problem.
sebastian.wasser at gmail ¶
5 years ago
I wanted to share my findings on static properties of anonymous classes.
So, given an anonymous class' object generating function like this:
<?php
function nc () {
return new class {
public static $prop = [];
};
}
?>
Getting a new object and changing the static property:
<?php
$a = nc();
$a::$prop[] = 'a';
var_dump($a::$prop);
// array(1) {
// [0] =>
// string(1) "a"
// }
?>
Now getting another object and changing the static property will change the original one, meaning that the static property is truly static:
<?php
$b = nc();
$b::$prop[] = 'b';
var_dump($b::$prop); // Same as var_dump($a::$prop);
// array(2) {
// [0] =>
// string(1) "a"
// [1] =>
// string(1) "b"
// }
assert($a::$prop === $b::$prop); // true
?>
razvan_bc at yahoo dot com ¶
4 years ago
you can try these
<?php
$oracle=&$_['nice_php'];
$_['nice_php']=(function(){
return new class{
public static function say($msg){
echo $msg;
}
public static function sp(){
echo self::say(' ');
}
};
});
/*
$_['nice_php']()::say('Hello');
$_['nice_php']()::sp();
$_['nice_php']()::say('World');
$_['nice_php']()::sp();
$_['nice_php']()::say('!');
//almost the same code bottom
*/
$oracle()::say('Hello');
$oracle()::sp();
$oracle()::say('World');
$oracle()::sp();
$oracle()::say('!');
?>
j.m \ jamesweb \ ca ¶
7 years ago
/* I like the idea of OneShot classes.
Thanks to that Anonymous bro\sist for precising
new class( $a, $b )
¯¯¯¯¯¯¯¯¯
If you are looking for "Delayed OneShot Anonymous Classes" for any reason (like the reason: loading files in a readable manner while not using autoload), it would probably look something like this; */
$u = function()use(&$u){
$u = new class{private $name = 'Utils';};
};
$w = function(&$rewrite)use(&$w){
$w = null;
$rewrite = new class{private $name = 'DataUtils';};
};
// Usage;
var_dump(
array(
'Delayed',
'( Self Destructive )',
'Anonymous Class Creation',
array(
'Before ( $u )' => $u,
'Running ( $u() )' => $u(),
'After ( $u )' => $u,
),
0,0,
0,0,
0,0,
'Delayed',
'( Overwriting && Self Destructive )',
'Anonymous Class Creation',
array(
'Before ( $w )' => $w,
'Running ( $w($u) )' => $w($u),
'After ( $w )' => $w,
'After ( $u )' => $u
)
)
);
// btw : oh shoot I failed a spam challenge
piotr at maslosoft dot com ¶
7 years ago
Please note that class name returned by `get_class` might contain null bytes, as is the case in my version of PHP (7.1.4).
Name will change when class starting line or it's body is changed.
Yes, name is implementation detail that should not be relied upon, but in some rare use cases it is required (annotating anonymous class).
solobot ¶
7 years ago
eval() is workaround for generating multiple anonymous classes with static properties in loop
<?php
public function generateClassMap()
{
foreach ($this->classMap as $tableName => $class)
{
$c = null;
eval('$c = new class extends \common\MyStaticClass {
public static $tableName;
public static function tableName()
{
return static::$tableName;
}
};');
$c::$tableName = $this->replicationPrefix.$tableName;
$this->classMap[$tableName] = $c;
}
}
?>
thus every class will have its own $tableName instead of common ancestor.
primipilus13 at gmail dot com ¶
8 years ago
<?php
// using constructor and extends in anonymous class
class A
{
private $name;
public function __construct($name)
{
$this->name = $name;
}
public function getName()
{
return $this->name;
}
}
$b = new class('anonymous') extends A
{
public function getName()
{
return parent::getName() . ' class';
}
};
echo $b->getName(), PHP_EOL;
// result: anonimous class
