Example of ObjectPool pattern

<?php

abstract class PoolObject
{
    static public function PoolConstructor($type, ...$params)
    {
        return new $type(...$params);
    }
}

// pool server
class Pool
{

    private $pool = array();

    public function getObject($type, $reference, ...$params)
    {
        if(!isset($this->pool[$type][$reference]))
            $this->pool[$type][$reference] = $type::PoolConstructor($type, ...$params);
        return $this->pool[$type][$reference];
    }

}

class ejemplo extends PoolObject
{

    private $ejemplo = null;

    public function __construct($hola)
    {
        echo $hola;
    }
}

$pool = new Pool();

$hola = 'hola brother';

$instanceOfEjemplo = $pool->getObject('ejemplo', 1, $hola);