<?php

$array = array("playlist"=> 8002, "mp3"=>1024);

class Mix {
   public function __construct($array) {
    foreach($array as $key => $value) {
        $this->$key = $value;
      }
   }
}

$class = new Mix($array);
var_dump($class);

object(Mix)#1 (2) {
  ["playlist"]=>
  int(8002)
  ["mp3"]=>
  int(1024)
}