Funcții ale claselor/obiectelor
PHP Manual

is_subclass_of

(PHP 4, PHP 5)

is_subclass_ofChecks if the object has this class as one of its parents

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.

Parametri

object

A class name or an object instance

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.

Istoria schimbărilor

Versiunea Descriere
5.3.9 Added allow_string parameter
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

Note

Notă:

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

Vedeți de asemenea


Funcții ale claselor/obiectelor
PHP Manual