table-builder-block / includes / Traits / Singleton.php

Singleton.php in TableKit – WordPress Table Builder for Data Tables, WooCommerce Product Tables & Post Tables 2.2.13, at includes/Traits/Singleton.php

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1	<?php
2	/**
3	* Generic singleton trait for per-class shared instances
4	*
5	* @package TableKit
6	*/
7
8	namespace TableBuilder\Traits;
9
10	/**
11	* Generic singleton trait: gives any class a shared instance() accessor
12	* keyed by class name, so subclasses don't each need to reimplement it.
13	*
14	* @package TableBuilder\Traits
15	*/
16	trait Singleton {
17	/**
18	* Shared instances, keyed by class name.
19	*
20	* @var array
21	*/
22	private static $instances = array();
23
24	/**
25	* Gets (and lazily creates) the shared instance of the using class.
26	*
27	* @return static The shared instance.
28	*/
29	public static function instance() {
30	$class = get_called_class();
31	if ( ! isset( self::$instances[ $class ] ) ) {
32	self::$instances[ $class ] = new $class();
33	}
34	return self::$instances[ $class ];
35	}
36	}
37