<?php
class MemoryCache {
    private static $cache = [];
    static function load($param) {
        $backTrace = debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 2)[1];
        $key = md5(serialize($backTrace['object']).$backTrace['function']);

        if (!array_key_exists($key, self::$cache)) {
            self::$cache[$key] = $param();
        }

        return self::$cache[$key];
    }
}

global $i;
$i=0;
class Dealer {
     
    public $name = null;
 
    public function __construct($name) {
      $this->name = $name;
    }
 
    public function getName() {
      return MemoryCache::load(function () {
          global $i;
          $i++;
        return strtolower($this->name); //point 1
      });
    }

    public function getUName() {
      return MemoryCache::load(function () {
          global $i;
          $i++;
        return strtoupper($this->name); //point 1
      });
    }
  }


  $dealer = new Dealer('funivan');
  echo $dealer->getName() . "\n";
  echo $dealer->getName() . "\n";
  echo $dealer->getName() . "\n";
  echo $dealer->getUName() . "\n";
  echo $dealer->getUName() . "\n";
  echo $dealer->getUName() . "\n";

echo $i;