function arraycd($arr){
static $res_arr=array();
if(is_array($arr))
{
 foreach($arr as $key=>$val)
   {
      if(is_array($val))
      {
         arraycd($val);
         }else{
         $res_arr[]=$val;
         }
         }
         }elseif(is_string($arr))
         {
            $res_arr[]=$arr;
            }
            return implode(",",$res_arr);
            }

$fruits = array (
"fruits" => array("a" => "orange", "b" => "banana", "c" => "apple"),
"numbers" => array(1, 2, 3, 4, 5, 6),
"holes" => array("first", 5 => "second", "third")
);

$strayy=arraycd($fruits);

var_dump($strayy);

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