<input type="file" name="pic[]" accept="image/*" />
<input type="file" name="pic[]" accept="image/*" />
<input type="file" name="pic[]" accept="image/*" />

// Count # of uploaded files in array
$total = count($_FILES['pic']['name']);

// Loop through each file
for($i=0; $i<$total; $i++) {
   //Get the temp file path
   $tmpFilePath = $_FILES['pic']['tmp_name'][$i];

   //Make sure we have a filepath
   if ($tmpFilePath != ""){
      //Setup our new file path
      $newFilePath = "./uploadFiles/" . $_FILES['pic']['name'][$i];

      //Upload the file into the temp dir
      if(move_uploaded_file($tmpFilePath, $newFilePath)) {

         //success

      }else{

         //fail

      }
   }
}

ลองดูครับไม่ยาก ^___^