These functions allow you to obtain information about classes
and instance objects. You can obtain the name of the class to
which an object belongs, as well as its member properties and
methods. Using these functions, you can find out not only the
class membership of an object, but also its parentage (i.e.
what class is the object class extending).
In this example, we first define a base class and an extension
of the class. The base class describes a general vegetable,
whether it is edible or not and what is its color. The subclass
Spinach adds a method to cook it and another to
find out if it is cooked.
Example 1. classes.inc
<?php
// base class with member properties and methods class Vegetable {
// extends the base class class Spinach extends Vegetable {
var $cooked = false;
function Spinach() { $this->Vegetable(true, "green"); }
function cook_it() { $this->cooked = true; }
function is_cooked() { return $this->cooked; }
} // end of class Spinach
?>
We then instantiate 2 objects from these classes and print out
information about them, including their class parentage.
We also define some utility functions, mainly to have a nice printout
of the variables.
Example 2. test_script.php
<pre> <?php
include "classes.inc";
// utility functions
function print_vars($obj) { foreach (get_object_vars($obj) as $prop => $val) { echo "\t$prop = $val\n"; } }
function print_methods($obj) { $arr = get_class_methods(get_class($obj)); foreach ($arr as $method) { echo "\tfunction $method()\n"; } }
function class_parentage($obj, $class) { if (is_subclass_of($GLOBALS[$obj], $class)) { echo "Object $obj belongs to class " . get_class($$obj); echo " a subclass of $class\n"; } else { echo "Object $obj does not belong to a subclass of $class\n"; } }
// instantiate 2 objects
$veggie = new Vegetable(true, "blue"); $leafy = new Spinach();
// print out information about objects echo "veggie: CLASS " . get_class($veggie) . "\n"; echo "leafy: CLASS " . get_class($leafy); echo ", PARENT " . get_parent_class($leafy) . "\n";
// show veggie properties echo "\nveggie: Properties\n"; print_vars($veggie);
// and leafy methods echo "\nleafy: Methods\n"; print_methods($leafy);
One important thing to note in the example above is that
the object $leafy is an instance of the class
Spinach which is a subclass of
Vegetable,
therefore the last part of the script above will output:
[...]
Parentage:
Object leafy does not belong to a subclass of Spinach
Object leafy belongs to class spinach a subclass of Vegetable
Table of Contents
call_user_method_array --
Call a user method given with an array of parameters [deprecated]
call_user_method --
Call a user method on an specific object [deprecated]
class_exists -- Checks if the class has been defined
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