Classes/Object Functions

`__autoload`

call_user_method_array

call_user_method

class_alias

class_exists

get_called_class

get_class_methods

get_class_vars

get_class

get_declared_classes

get_declared_interfaces

get_declared_traits

get_object_vars

interface_exists

is_a

is_subclass_of

is_subclass_of — Checks if the object has this class as one of its parents or implements it.
object,class_name,allow_string

Ex. 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";
}
?>

Result

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

method_exists

method_exists — Checks if the class method exists.

bool method_exists ( mixed $object , string $method_name )

object, method_name . Returns TRUE if the method given by method_name has been defined for the given object, FALSE otherwise

property_exists

property_exists — Checks if the object or class has a property .

Returns TRUE if the property exists, FALSE if it doesn’t exist or NULL in case of an error.

<?php
class myClass {
    public $mine;
    private $xpto;
    static protected $test;
    static function test() {
        var_dump(property_exists('myClass', 'xpto')); //true
    }
}
var_dump(property_exists('myClass', 'mine'));   //true
var_dump(property_exists(new myClass, 'mine')); //true
var_dump(property_exists('myClass', 'xpto'));   //true, as of PHP 5.3.0
var_dump(property_exists('myClass', 'bar'));    //false
var_dump(property_exists('myClass', 'test'));   //true, as of PHP 5.3.0
myClass::test();
?>

trait_exists

trait_exists — Checks if the trait exists

bool trait_exists ( string $traitname [, bool $autoload ] )

traitname , autoload .

<?php
trait World {
    private static $instance;
    protected $tmp;
    public static function World()
    {
        self::$instance = new static();
        self::$instance->tmp = get_called_class().' '.__TRAIT__;
        return self::$instance;
    }
}
if ( trait_exists( 'World' ) ) {
    class Hello {
        use World;
        public function text( $str )
        {
            return $this->tmp.$str;
        }
    }
}
echo Hello::World()->text('!!!'); // Hello World!!!

PHP