66 lines
1.0 KiB
PHP
66 lines
1.0 KiB
PHP
<?php
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/**
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* The singleton class file.
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*
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* @package GenerateCloud\Utils
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*/
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namespace GenerateCloud\Utils;
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use Exception;
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if ( ! defined( 'ABSPATH' ) ) {
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exit; // Exit if accessed directly.
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}
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/**
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* Singleton class.
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*
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* @since 1.0.0
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*/
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class Singleton {
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/**
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* Child class instances.
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*
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* @var array<static>
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*/
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private static array $instances = [];
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/**
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* The singleton constructor can not be public.
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*/
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final protected function __construct() {
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}
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/**
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* Not allowed to clone a singleton.
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*/
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protected function __clone() {
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}
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/**
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* Not allowed to un-serialize a singleton.
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*
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* @throws Exception Cannot un-serialize a singleton.
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*/
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public function __wakeup() {
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throw new Exception( 'Cannot un-serialize singleton' );
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}
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/**
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* Get the class instance.
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*
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* @return static
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*/
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public static function get_instance(): Singleton {
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$subclass = static::class;
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if ( ! isset( self::$instances[ $subclass ] ) ) {
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self::$instances[ $subclass ] = new static();
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}
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return self::$instances[ $subclass ];
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}
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}
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