Memoize.php

<?php

/**
 * 
 * Example 
 * 
 * $result = Memoize::call([Product::className(), 'getSkuMap']);  // slow operation
 * $result2 = Memoize::call([Product::className(), 'getSkuMap']); // next call will be faster
 * 
 * @author    Dmytro Karpovych
 * @copyright 2016 NRE
 */
namespace app\helpers;


class Memoize
{
    protected static $cache = [];

    /**
     * @param $func
     * @param array $args
     * @return mixed
     */
    public static function call($func, $args = [])
    {
        return call_user_func_array(self::get($func), $args);
    }

    public static function get($func)
    {
        $key = md5(serialize($func));

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

    /**
     * @param $func
     * @return \Closure
     */
    public static function getMemoize($func)
    {
        return function () use ($func) {
            static $cache = [];

            $args = func_get_args();
            $key = md5(serialize($args));

            if (!array_key_exists($key, $cache)) {
                $cache[$key] = call_user_func_array($func, $args);
            }

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