class_alias(3) [php man page]

CLASS_ALIAS(3)								 1							    CLASS_ALIAS(3)

class_alias - Creates an alias for a class

SYNOPSIS

       bool class_alias TRUE (string  $original, string  $alias, [bool	$autoload])

DESCRIPTION

	Creates an alias named $alias based on the user defined class $original. The aliased class is exactly the same as the original class.

PARAMETERS

	      o $original
		- The original class.

	      o $alias
		- The alias name for the class.

	      o $autoload
		- Whether to autoload if the original class is not found.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      class_alias(3) example

	      <?php

	      class foo { }

	      class_alias('foo', 'bar');

	      $a = new foo;
	      $b = new bar;

	      // the objects are the same
	      var_dump($a == $b, $a === $b);
	      var_dump($a instanceof $b);

	      // the classes are the same
	      var_dump($a instanceof foo);
	      var_dump($a instanceof bar);

	      var_dump($b instanceof foo);
	      var_dump($b instanceof bar);

	      ?>

	      The above example will output:

	      bool(true)
	      bool(false)
	      bool(true)
	      bool(true)
	      bool(true)
	      bool(true)
	      bool(true)

SEE ALSO

       get_parent_class(3), is_subclass_of(3).

PHP Documentation Group 													    CLASS_ALIAS(3)

IS_A(3) 								 1								   IS_A(3)

is_a - Checks if the object is of this class or has this class as one of its parents

SYNOPSIS

       bool is_a FALSE (object	$object, string  $class_name, [bool  $allow_string])

DESCRIPTION

	Checks if the given $object is of this class or has this class as one of its parents.

PARAMETERS

	      o $object
		- The tested object

	      o $class_name
		- The class name

	      o $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.

RETURN VALUES

	Returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.9	|						    |
       |	|						    |
       |	|	    Added $allow_string parameter	    |
       |	|						    |
       | 5.3.0	|						    |
       |	|						    |
       |	|  This function is no longer deprecated, and  will |
       |	| therefore no longer throw E_STRICT warnings.	    |
       |	|						    |
       | 5.0.0	|						    |
       |	|						    |
       |	|  This function became deprecated in favour of the |
       |	| instanceof operator. Calling this  function  will |
       |	| result in an E_STRICT warning.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      is_a(3) example

	      <?php
	      // define a class
	      class WidgetFactory
	      {
		var $oink = 'moo';
	      }

	      // create a new object
	      $WF = new WidgetFactory();

	      if (is_a($WF, 'WidgetFactory')) {
		echo "yes, $WF is still a WidgetFactory
";
	      }
	      ?>

       Example #2

	      Using the instanceof operator in PHP 5

	      <?php
	      if ($WF instanceof WidgetFactory) {
		  echo 'Yes, $WF is a WidgetFactory';
	      }
	      ?>

SEE ALSO

       get_class(3), get_parent_class(3), is_subclass_of(3).

PHP Documentation Group 														   IS_A(3)