get_class

(PHP 4, PHP 5)

get_class -- Возвращает имя класса к которому принадлежит объект

Description

string get_class ( object obj )

Функция возвращает имя класса экземпляром которого является объект obj. Если obj не является объектом, функция вернет FALSE

Замечание: Внутренние классы PHP, объявленные в расширениях возвращаются в оригинальном регистре. В PHP 4, функция get_class() возвращает имя класса в нижнем регистре, однако в PHP 5 имя также возвращается в оригинальном регистре, аналогично классам расширений.

Пример 1. Использование get_class()

<?php

class foo {
   function foo()
   {
   // имплементация чего-либо
   }

   function name()
   {
       echo "My name is " , get_class($this) , "\n";
   }
}

// создание объекта
$bar = new foo();

// внешний вызов
echo "Its name is " , get_class($bar) , "\n";

// внутренний вызов
$bar->name();

?>

выведет: 

Its name is foo
My name is foo

См. также get_parent_class(), gettype() и is_subclass_of().



get_class
benjaminhill at gmail dot com
27-Apr-2006 10:47
More funkyness:

class Parent {
   function displayTableName() {
     echo get_class($this);
     echo get_class();
   }
}

class Child {
   function __construct() {
     $this->displayTableName();
   }
}

Will return
- Child
- Parent

So when they say "the object isn't required in PHP5" - they don't really mean it.
brjann at NOSPAMATALLgmail dot com
16-Nov-2005 12:39
This behavior is unexpected, but good to be aware of

class parentclass {
   public function getClass(){
       echo get_class($this); //using "$this"
   }
}
class child extends parentclass {
}

$obj = new child();
$obj->getClass(); //outputs "child"

class parentclass {
   public function getClass(){
       echo get_class(); //note, no "$this"
   }
}
class child extends parentclass {
}

$obj = new child();
$obj->getClass(); //outputs "parentclass"
davidc at php dot net
13-Oct-2005 10:25
As of php5, you cannot use get_class($this); in a public static function. You would have to do something like this:

<?php

class BooBoof {
   public static function getclass()
   {
       return __CLASS__;
   }
}

$c = BooBoof::getclass();
print $c;
?>

To get the class since you cannot use
<?php
public static function getclass()
{
   return get_class($this);
}
?>

Rather simple and straightforward but that might help some people that are searching for it..
wired at evd dot ru
25-Sep-2005 02:25
There is one unexpected bahaviour (for me as least):

<?php

  class parent
  {
   ...

   public function getInstance ($id)
   {
     ...

     print get_class() . "\n" . __CLASS__;

     ...
   }
  }

  class child extends parent
  {
   ...
  }

  child::getInstance(...);
?>

This code will produce:

  parent
  parent

So I can't make "new $className(...)" in getInstance(). The only option is to do a fabric.
kunxin at creaion dot com
25-Jul-2005 05:30
I just migrated from PHP 4 to PHP 5 and noticed that in PHP 5.03 that a lot of code dependent on get_class() and its variants stop working.

It turns out that get_class() and its variants are now case-sensitive.
refrozen dot com
05-Jul-2005 03:01
philip at cornado dot com, it returns the value of the class from which it was called, rather than the instance's name... causing inheritance to result in unexpected returns
MagicalTux at FF.ST
02-Feb-2004 04:11
Note that the constant __CLASS__ is different from get_class($this) :
<?
  class test {
   function whoami() {
     echo "Hello, I'm whoami 1 !\r\n";
     echo "Value of __CLASS__ : ".__CLASS__."\r\n";
     echo "Value of get_class() : ".get_class($this)."\r\n\r\n";
   }
  }
  class test2 extends test {
   function whoami2() {
     echo "Hello, I'm whoami 2 !\r\n";
     echo "Value of __CLASS__ : ".__CLASS__."\r\n";
     echo "Value of get_class() : ".get_class($this)."\r\n\r\n";
     parent::whoami(); // call parent whoami() function
   }
  }
  $test=new test;
  $test->whoami();
  $test2=new test2;
  $test2->whoami();
  $test2->whoami2();
?>

The output is :
Hello, I'm whoami 1 !
Value of __CLASS__ : test
Value of get_class() : test

Hello, I'm whoami 1 !
Value of __CLASS__ : test
Value of get_class() : test2

Hello, I'm whoami 2 !
Value of __CLASS__ : test2
Value of get_class() : test2

Hello, I'm whoami 1 !
Value of __CLASS__ : test
Value of get_class() : test2

In fact, __CLASS__ returns the name of the class the function is in and get_class($this) returns the name of the class which was created.
Dan
29-Jan-2003 10:00
This function does return the class name in lowercase, but that does not seem to make any difference. The code below, although very sloppy, works fine in all of the following configurations.

PHP 4.2.2 on Windows NT5 with Apache 1.3.24
PHP 4.2.1 in Zend Development Environment on box above
PHP 4.2.3 on Linux RedHat 7.3 with Apache 1.3.27

class TeSt {
   var $a;
   var $b = "Fred";

   // Notice the case difference in the constructor name

   function Test() {
     $classname = get_class($this); // $classname = "test"
     $this->ra = get_class_vars($classname);
   }
}
// Next line also works with Test(), TEST(), or test()
$obj = new TeSt();
print_r($obj->ra);

Result :
   Array
   (
       [a] =>
       [b] => Fred
   )
oliver DOT pliquett @mediagear DOT de
13-Aug-2002 08:07
This function can become _VERY_ helpful if you want to return a new object of the same type. See this example:

<?php
class Foo{
   var $name;
  
   function Foo( $parameter ){
       $this->name = $parameter;
   }

   function whoami() {
       echo "I'm a " . get_class( $this ) ."\n";
   }
  
   function getNew() {
       $className = get_class( $this );
      
       // here it happens:
       return new $className ( "world" ) ;
   }
}
class Bar extends Foo {

   function Bar( $name ){
       $this->Foo( $name );
   }

   function welcome() {
       echo "Hello, " . $this->name .  "! \n";
   }
}

// We generate a Bar object:
$myBar = new Bar( "Oliver" );
$myBar->welcome();

//now let's instanciate a new Bar object.
//note: this method is inherited from Foo by Bar!

$baba = $myBar->getNew();

$baba->welcome();
$baba->whoami();

/* Output:
Hello, Oliver!
Hello, world!
I'm a bar
*/
?>
philip at cornado dot com
20-Jun-2002 12:15
As of PHP 4.3.0 the constant __CLASS__ exists and contains the class name.

<get_class_varsget_declared_classes>
 Last updated: Tue, 15 Nov 2005