[Singletone]

singletone.php

<?php

class Singletone {
    private static $instance;
    private function __construct()
    {
    }
    
    public static function instance() {
        if (!isset(static::$instance)) {
            static::$instance = new static();
        }
        
        return static::$instance;
    }
}

$foo = Singletone::instance();