<?php
   $arr = array('first' => array("id"=>1,"name"=>"test","value"=>3),'second' => array("id"=>2,"name"=>"test2","value"=>4));
   $arr= json_encode($arr);
   $name_arr=array();
   foreach(json_decode($arr) as $val){
        $name_arr[]=$val->name;
   }
   
   var_dump($name_arr);
?>