interface_exists(3) [php man page]

INTERFACE_EXISTS(3)							 1						       INTERFACE_EXISTS(3)

interface_exists - Checks if the interface has been defined

SYNOPSIS

       bool interface_exists (string  $interface_name, [bool  $autoload = true])

DESCRIPTION

	Checks if the given interface has been defined.

PARAMETERS

	      o $interface_name
		- The interface name

	      o $autoload
		- Whether to call __autoload or not by default.

RETURN VALUES

	Returns TRUE if the interface given by $interface_name has been defined, FALSE otherwise.

EXAMPLES

       Example #1

	      interface_exists(3) example

	      <?php
	      // Check the interface exists before trying to use it
	      if (interface_exists('MyInterface')) {
		  class MyClass implements MyInterface
		  {
		      // Methods
		  }
	      }

	      ?>

SEE ALSO

       get_declared_interfaces(3), class_implements(3), class_exists(3).

PHP Documentation Group 												       INTERFACE_EXISTS(3)

CLASS_PARENTS(3)							 1							  CLASS_PARENTS(3)

class_parents - Return the parent classes of the given class

SYNOPSIS

       array class_parents (mixed  $class, [bool  $autoload = true])

DESCRIPTION

	This function returns an array with the name of the parent classes of the given $class.

PARAMETERS

	      o $class
		- An object (class instance) or a string (class name).

	      o $autoload
		- Whether to allow this function to load the class automatically through the __autoload(3) magic method.

RETURN VALUES

	An array on success, or FALSE on error.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.1.0	|						    |
       |	|						    |
       |	|  Added the option to pass the $class parameter as |
       |	| a string. Added the $autoload parameter.	    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      class_parents(3) example

	      <?php

	      class foo { }
	      class bar extends foo {}

	      print_r(class_parents(new bar));

	      // since PHP 5.1.0 you may also specify the parameter as a string
	      print_r(class_parents('bar'));

	      function __autoload($class_name) {
		 require_once $class_name . '.php';
	      }

	      // use __autoload to load the 'not_loaded' class
	      print_r(class_parents('not_loaded', true));
	      ?>

	      The above example will output something similar to:

	      Array
	      (
		  [foo] => foo
	      )

	      Array
	      (
		  [parent_of_not_loaded] => parent_of_not_loaded
	      )

SEE ALSO

       class_implements(3).

PHP Documentation Group 													  CLASS_PARENTS(3)