ค่าที่ได้จาก การ upload file $_FILES ค่าที่ได้เป็น empty ครับ(php)

<? function body_edit_usr() 
{ 
                 $query = get_user($_SESSION["user"]);
                
                 $row = mysql_fetch_array($query);?>
         <div data-role="content">
            <form action = "?page=usr&com=edit" method="post"  enctype="multipart/form-data" >
             <input type="hidden" name="check" = value=1>         
              <input type="hidden" name="old_pro" = value="<? echo $row["user_pic"]; ?>" >
              <ul data-role="listview">
              <li><img src="../user/<? echo $_SESSION["user"]."/".$row["user_pic"]; ?>"><h3>Edit Display</h3><p><input name="user_pic" type="file"></p></li>
              <li><h3>Fname</h3><p><input type="text"  name="fname" value="<? echo $row["fname"]; ?>"></p></li> 
              <li><h3>Lname</h3><p><input type="text"  name="lname" value="<? echo $row["lname"]; ?>"></p></li> 
              <li><h3>Address</h3><p><textarea name="add" rows=4 ><? echo $row["address"]; ?></textarea></p></li> 
              <li><h3>Email</h3><p><input type="text" name="Email" value="<? echo $row["Email"]; ?>"></p></li> 
              <li><h3>phone</h3><p><input type="number" maxlength=10 name ="phone" value="<? echo $row["phone"]; ?>" onkeypress="if( (event.which < 48 || event.which > 57 ) && event.which != 08 ) return false;" ></p></li>
              <li><input type="submit" value="submit"></li>
             </ul>
             </form>

	</div>
<? } ?>

if($_GET["com"] == "edit")
   {
      if($_POST["check"]==1)
       
      {
	
      echo $_FILES["user_pic"]["name"];     edit_user($_POST["fname"],$_POST["lname"],$_POST["add"],$_POST["Email"],$_POST["phone"],$_FILES["user_pic"],$_POST["old_pro"]);
      }
       view_usr_pro(); 
   }