ถามเกี่ยวกับการดึงข้อมูล mysql ใน for loop ออกแค่ตัวสุดท้ายครับ

<?php
include 'connect.php';

$select_item = explode(',', $_GET['item']); //1,3
$number = count($select_item);  //2

// echo $select_item[0] ."<br>";
// echo $select_item[1] ."<br>";

for($i=0; $i<$number; $i++){  
$sql_item = $db->prepare('SELECT list FROM tbl_machine WHERE type = :type');
$sql_item->bindParam(':type',$select_item[$i],PDO::PARAM_STR);
// $sql_item->bindParam(':type',$select_item[$i],PDO::PARAM_STR);
$sql_item->execute();


while ($results = $sql_item->fetch(PDO::FETCH_ASSOC)) {
	echo $results['list'];
}
}
?>