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Example class pattern for use in WordPress that takes the best parts of singletons and the best parts of instances and uses them together where 1+1 is greater than 2.
<?php
/**
* Class WP_Namespace_Class
*
* Allows access to the singleton class via the class name, no global or local variable required.
*/
class WP_Namespace_Class {
/**
* @var WP_Namespace_Class $_instance;
*/
private static $_instance;
/**
* Initialize
*/
static function on_load() {
/**
* This could just be the default. We could implement
* dependency injection to support subclasses of the
* instance class using a variety of means, i.e. via
* filters, set methods, etc.
*/
self::$_instance = new WP_Namespace_Class_Instance();
}
/**
* Allow access to singleton
*
* @return WP_Namespace_Class_Instance
*/
static function get_instance() {
return self::$_instance;
}
/**
* Returns 'foo'
*
* @return string
*/
function get_foo() {
return self::$_instance->get_foo();
}
/**
* Echo 'foo'
*/
function the_foo() {
self::$_instance->the_foo();
}
}
WP_Namespace_Class::on_load();
/**
* Class WP_Namespace_Class_Instance
*
* This class can be unit tested, easier to work with in a debugger,
* supports inheritance and the code just feels better w/o all the statics.
*/
class WP_Namespace_Class_Instance {
/**
*
*/
function __construct() {
add_action( 'init', array( $this, 'init' ) );
}
/**
*
*/
function init() {
// Initialize hooks and other stuff here.
}
/**
* Returns 'foo'
*
* @return string
*/
function get_foo() {
return 'foo';
}
/**
* Echo 'foo'
*/
function the_foo() {
echo $this->get_foo();
}
}
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