Funcții ale claselor/obiectelor
PHP Manual

class_exists

(PHP 4, PHP 5, PHP 7)

class_existsChecks if the class has been defined

Descrierea

bool class_exists ( string $class_name [, bool $autoload = true ] )

This function checks whether or not the given class has been defined.

Parametri

class_name

The class name. The name is matched in a case-insensitive manner.

autoload

Whether or not to call __autoload by default.

Valorile întoarse

Returns TRUE if class_name is a defined class, FALSE otherwise.

Istoricul schimbărilor

Versiune Descriere
5.0.2 No longer returns TRUE for defined interfaces. Use interface_exists().

Exemple

Example #1 class_exists() example

<?php
// Check that the class exists before trying to use it
if (class_exists('MyClass')) {
    
$myclass = new MyClass();
}

?>

Example #2 autoload parameter example

<?php
function __autoload($class)
{
    include(
$class '.php');

    
// Check to see whether the include declared the class
    
if (!class_exists($classfalse)) {
        
trigger_error("Unable to load class: $class"E_USER_WARNING);
    }
}

if (
class_exists('MyClass')) {
    
$myclass = new MyClass();
}

?>

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Funcții ale claselor/obiectelor
PHP Manual