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wp-content/plugins/generatecloud/includes/Utils/Singleton.php

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