get_called_class

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

get_called_classThe "Late Static Binding" class name

Descrizione

get_called_class(): string

Gets the name of the class the static method is called in.

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

Returns the class name.

Errori/Eccezioni

If get_called_class() is called from outside a class, an Error is thrown. Prior to PHP 8.0.0, an E_WARNING level error was raised.

Log delle modifiche

Versione Descrizione
8.0.0 Calling this function from outside a class, will now throw an Error. Previously, an E_WARNING was raised and the function returned false.

Esempi

Example #1 Using get_called_class()

<?php

class foo {
static public function
test() {
var_dump(get_called_class());
}
}

class
bar extends foo {
}

foo::test();
bar::test();

?>

Il precedente esempio visualizzerà:

string(3) "foo"
string(3) "bar"

Vedere anche:

  • get_parent_class() - Restituisce il nome della classe genitrice di un oggetto o di una classe
  • get_class() - Restituisce il nome della classe di un oggetto
  • is_subclass_of() - Verifica se l'oggetto ha questa classe come una dei suoi genitori o la implementa

add a note

User Contributed Notes 9 notes

up
87
Safak Ozpinar
10 years ago
As of PHP 5.5 you can also use "static::class" to get the name of the called class.

<?php
class Bar {
public static function
test() {
var_dump(static::class);
}
}

class
Foo extends Bar {

}

Foo::test();
Bar::test();
?>

Output:

string(3) "Foo"
string(3) "Bar"
up
12
luc at s dot illi dot be
11 years ago
get_called_class() in closure-scopes:

<?PHP
ABSTRACT CLASS Base
{
protected static
$stub = ['baz'];

//final public function boot()
static public function boot()
{
print
__METHOD__.'-> '.get_called_class().PHP_EOL;

array_walk(static::$stub, function()
{
print
__METHOD__.'-> '.get_called_class().PHP_EOL;
});
}

public function
__construct()
{
self::boot();
print
__METHOD__.'-> '.get_called_class().PHP_EOL;

array_walk(static::$stub, function()
{
print
__METHOD__.'-> '.get_called_class().PHP_EOL;
});
}
}

CLASS
Sub EXTENDS Base
{
}

// static boot
Base::boot(); print PHP_EOL;
// Base::boot -> Base
// Base::{closure} -> Base

Sub::boot(); print PHP_EOL;
// Base::boot -> Sub
// Base::{closure} -> Base

new sub;
// Base::boot -> Sub
// Base::{closure} -> Base
// Base->__construct -> Sub
// Base->{closure} -> Sub

// instance boot
new sub;
// Base->boot -> Sub
// Base->{closure} -> Sub
// Base->__construct -> Sub
// Base->{closure} -> Sub
?>
up
4
amcolin at 126 dot com
4 years ago
namespace root;
class Factor {
protected static $instance = null;

private function __construct() {

}

public static function getInstance() {
if (!self::$instance) {
$name = get_called_class();
self::$instance = new $name();
}

return self::$instance;
}
}

namespace admin\test;

use root\Factor;

class Single extends Factor {
public function abc() {
return 'abc';
}
}

namespace index;

use admin\test\Single;

class Index {
public function get() {
return Single::getInstance();
}
}

$index = new Index();
var_dump($index->get());

The result is:

object(admin\test\Single)#2 (0) {
}
up
15
uebele
13 years ago
SEE: http://php.net/manual/en/language.oop5.late-static-bindings.php

I think it is worth mentioning on this page, that many uses of the value returned by get_called_function() could be handled with the new use of the old keyword static, as in
<?php
static::$foo;
?>

versus
<?php
$that
=get_called_class();
$that::$foo;
?>

I had been using $that:: as my conventional replacement for self:: until my googling landed me the url above. I have replaced all uses of $that with static with success both as
<?php
static::$foo; //and...
new static();
?>

Since static:: is listed with the limitation: "Another difference is that static:: can only refer to static properties." one may still need to use a $that:: to call static functions; though I have not yet needed this semantic.
up
3
fantomx1 at gmail dot com
7 years ago
When calling dynamic method statically in php 5.6 (under 7) it allows it, but it doesnt work, it incorrectly evaluates class that called our subject class, therefore containing method must be static.
up
7
danbettles at yahoo dot co dot uk
16 years ago
It is possible to write a completely self-contained Singleton base class in PHP 5.3 using get_called_class.

<?php

abstract class Singleton {

protected function
__construct() {
}

final public static function
getInstance() {
static
$aoInstance = array();

$calledClassName = get_called_class();

if (! isset (
$aoInstance[$calledClassName])) {
$aoInstance[$calledClassName] = new $calledClassName();
}

return
$aoInstance[$calledClassName];
}

final private function
__clone() {
}
}

class
DatabaseConnection extends Singleton {

protected
$connection;

protected function
__construct() {
// @todo Connect to the database
}

public function
__destruct() {
// @todo Drop the connection to the database
}
}

$oDbConn = new DatabaseConnection(); // Fatal error

$oDbConn = DatabaseConnection::getInstance(); // Returns single instance
?>
up
4
php at itronic dot at
15 years ago
If you call a static getInstance() function to create a instance of a class from another class, this function have to be static, if it is not static the original name of the caller class and not of the current class get returned.

example:

<?php

class a {
function
getXName() {
return
x::getClassName();
}
function
getXStaticName() {
return
x::getStaticClassName();
}

}

class
b extends a {
}

class
x {
public function
getClassName() {
return
get_called_class();
}
public static function
getStaticClassName() {
return
get_called_class();
}
}

$a = new a();

$b = new b();

echo
$a->getXName(); // will return "a"
echo $b->getXName(); // will return "b"

echo $a->getXStaticName(); // will return "x"
echo $b->getXStaticName(); // will return "x"

?>
up
1
Abhi Beckert
15 years ago
Beware that this does not behave as expected if your method is not declared as static! For example:

<?php

class foo {
static public function
test() {
var_dump(get_called_class());
}

public function
testTwo() {
var_dump(get_called_class());
}
}

class
bar extends foo {
}

class
abc {
function
test() {
foo::test();
bar::test();
}

function
testTwo() {
foo::testTwo();
bar::testTwo();
}
}

echo
"basic\n";
foo::test();
bar::test();

echo
"basic without static declaration\n";
foo::testTwo();
bar::testTwo();

echo
"in a class\n";
$abc = new abc();
$abc->test();

echo
"in a class without static declaration\n";
$abc->testTwo();

?>

The result is:

basic
string 'foo'
string 'bar'

basic without static declaration
string 'foo'
string 'bar'

in a class
string 'foo'
string 'bar'

in a class without static declaration
string 'abc'
string 'abc'
up
-2
a dot cudbard-bell at sussex dot ac dot uk
15 years ago
Here's a simple way of getting the inheritance tree of a class, no matter which class the function was actually defined in. Will work as a static function method too.

<?php
class A {
public function
get_class_tree(){
$cur_class = get_called_class();
do {
echo
$cur_class;
}
while(
$cur_class = get_parent_class($cur_class));
}
}

class
B {

}

class
C {

}

$foo = new C();
$foo->get_class_tree();

?>

CBA
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