method_exists(3) [php man page]

METHOD_EXISTS(3)							 1							  METHOD_EXISTS(3)

method_exists - Checks if the class method exists

SYNOPSIS

       bool method_exists (mixed  $object, string  $method_name)

DESCRIPTION

	Checks if the class method exists in the given $object.

PARAMETERS

	      o $object
		- An object instance or a class name

	      o $method_name
		- The method name

RETURN VALUES

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

NOTES

       Note

	      Using this function will use any registered autoloaders if the class is not already known.

EXAMPLES

       Example #1

	      method_exists(3) example

	      <?php
	      $directory = new Directory('.');
	      var_dump(method_exists($directory,'read'));
	      ?>

	      The above example will output:

	      bool(true)

       Example #2

	      Static method_exists(3) example

	      <?php
	      var_dump(method_exists('Directory','read'));
	      ?>

	      The above example will output:

	      bool(true)

SEE ALSO

       function_exists(3), is_callable(3), class_exists(3).

PHP Documentation Group 													  METHOD_EXISTS(3)

CLASS_EXISTS(3) 							 1							   CLASS_EXISTS(3)

class_exists - Checks if the class has been defined

SYNOPSIS

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

DESCRIPTION

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

PARAMETERS

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

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

RETURN VALUES

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

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.0.2	|						    |
       |	|						    |
       |	|  No  longer  returns TRUE for defined interfaces. |
       |	| Use interface_exists(3).			    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      class_exists(3) 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($class, false)) {
		      trigger_error("Unable to load class: $class", E_USER_WARNING);
		  }
	      }

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

	      ?>

SEE ALSO

       function_exists(3), interface_exists(3), get_declared_classes(3).

PHP Documentation Group 													   CLASS_EXISTS(3)