Funcții ale claselor/obiectelor
PHP Manual

is_subclass_of

(PHP 4, PHP 5, PHP 7)

is_subclass_ofChecks if the object has this class as one of its parents or implements it.

Descrierea

bool is_subclass_of ( mixed $object , string $class_name [, bool $allow_string = TRUE ] )

Checks if the given object has the class class_name as one of its parents or implements it.

Parametri

object

A class name or an object instance. No error is generated if the class does not exist.

class_name

The class name

allow_string

If this parameter set to false, string class name as object is not allowed. This also prevents from calling autoloader if the class doesn't exist.

Valorile întoarse

This function returns TRUE if the object object, belongs to a class which is a subclass of class_name, FALSE otherwise.

Istoricul schimbărilor

Versiune Descriere
5.3.9 Added allow_string parameter
5.3.7 Added support for class_name to work with interfaces
5.0.3 You may also specify the object parameter as a string (the name of the class)

Exemple

Example #1 is_subclass_of() example

<?php
// define a class
class WidgetFactory
{
  var 
$oink 'moo';
}

// define a child class
class WidgetFactory_Child extends WidgetFactory
{
  var 
$oink 'oink';
}

// create a new object
$WF = new WidgetFactory();
$WFC = new WidgetFactory_Child();

if (
is_subclass_of($WFC'WidgetFactory')) {
  echo 
"yes, \$WFC is a subclass of WidgetFactory\n";
} else {
  echo 
"no, \$WFC is not a subclass of WidgetFactory\n";
}


if (
is_subclass_of($WF'WidgetFactory')) {
  echo 
"yes, \$WF is a subclass of WidgetFactory\n";
} else {
  echo 
"no, \$WF is not a subclass of WidgetFactory\n";
}


// usable only since PHP 5.0.3
if (is_subclass_of('WidgetFactory_Child''WidgetFactory')) {
  echo 
"yes, WidgetFactory_Child is a subclass of WidgetFactory\n";
} else {
  echo 
"no, WidgetFactory_Child is not a subclass of WidgetFactory\n";
}
?>

Exemplul de mai sus va afișa:

yes, $WFC is a subclass of WidgetFactory
no, $WF is not a subclass of WidgetFactory
yes, WidgetFactory_Child is a subclass of WidgetFactory

Example #2 is_subclass_of() using interface example

<?php
// Define the Interface
interface MyInterface
{
  public function 
MyFunction();
}

// Define the class implementation of the interface
class MyClass implements MyInterface
{
  public function 
MyFunction()
  {
    return 
"MyClass Implements MyInterface!";
  }
}

// Instantiate the object
$my_object = new MyClass;

// Works since 5.3.7

// Test using the object instance of the class
if (is_subclass_of($my_object'MyInterface')) {
  echo 
"Yes, \$my_object is a subclass of MyInterface\n";
} else {
  echo 
"No, \$my_object is not a subclass of MyInterface\n";
}

// Test using a string of the class name
if (is_subclass_of('MyClass''MyInterface')) {
  echo 
"Yes, MyClass is a subclass of MyInterface\n";
} else {
  echo 
"No, MyClass is not a subclass of MyInterface\n";
}
?>

Exemplul de mai sus va afișa:

Yes, $my_object is a subclass of MyInterface
Yes, MyClass is a subclass of MyInterface

Note

Notă:

Utilizarea acestei funcții va duce la utilizarea oricărui autoîncărcător înregistrat dacă clasa nu este cunoscută deja.

A se vedea și


Funcții ale claselor/obiectelor
PHP Manual