我正在使用REST风格的Web服务。我正在用一个函数（PHP）上传多张照片。
我已经使用$num_files = count($_FILES['myfile']['name'])来计算要上传的文件数，但这总是给出1：

当我打印$_FILES['myfile']['name']或$_FILES时，它返回最后一个图像。
我是否需要进行任何设置以一次发送多个文件？

<?php
if($result=="success")
{
    $num_files = count($_FILES['myfile']['name']);
    Zend_Debug::dump($num_files);
    die;
    for( $i=0; $i < $num_files; $i++ )
    {
        $name = $_FILES["myfile"]["name"][$i];
        $temp_path = $_FILES['myfile']['tmp_name'][$i];
        $image_name = Helper_common::getUniqueNameForFile( $name );

        echo $image_name;
        die;
        // Set the upload folder path
        $target_path = $originalDirecory."/";

        // Set upload image path
        $image_upload_path = $target_path.$image_name;
        move_uploaded_file($temp_path, $image_upload_path);

        //if(move_uploaded_file($temp_path, $image_upload_path))
        //{
        // Set 800*800 popup thumbnail...
        // Set popup directory...
        $thumbnail_directory=$popUpDirectory."/";
        // Set thumbnail name...
        $thumb_name1=$thumbnail_directory.'thumbnail_'.$image_name;
        // Set width and height of the thumbnail...
        $thumb_width=800;
        $thumb_height=800;
        $thumb1=Helper_common::generateThumbnail($image_upload_path, $thumb_name1, $thumb_width, $thumb_height);

        //if($thumb)
        //{
            // Set 435*333 thumbnail...
            // Set thumbnail directory...
            $thumbnail_directory=$wallDirecory."/";
            // Set thumbnail name...
            $thumb_name2=$thumbnail_directory.'thumbnail_'.$image_name;
            // Set width and height of the thumbnail...
            $thumb_width=435;
            $thumb_height=435;
            $thumb2=Helper_common::generateThumbnail($image_upload_path, $thumb_name2, $thumb_width, $thumb_height);

            //if($thumb)
            //{
                // Set 176*176 thumbnail...
                // Set thumbnail directory...
                $thumbnail_directory=$galleryDirectory."/";
                // Set thumbnail name...
                $thumb_name3=$thumbnail_directory.'thumbnail_'.$image_name;
                // Set width and height of the thumbnail...
                $thumb_width=176;
                $thumb_height=176;
                $thumb_smart_resize_3 = Helper_ImageResizer::smart_resize_image($image_upload_path, NULL, $thumb_width, $thumb_height, false, $thumb_name3, false);
                $thumb3=Helper_common::generateThumbnail($image_upload_path, $thumb_name3, $thumb_width, $thumb_height);
            //if($thumb)
            //{
                $profile_thumb=$thumb3;
                // Set 131*131 thumbnail...
                // Set thumbnail directory....
                $thumbnail_directory = $thumbnailsDirectory."/";
                // Set thumbnail name....
                $thumb_name4 = $thumbnail_directory.'thumbnail_'.$image_name;
                $thumb_width=131;
                $thumb_height=131;
                $thumb_smart_resize_4=Helper_ImageResizer::smart_resize_image($image_upload_path, NULL, $thumb_width, $thumb_height, false, $thumb_name4, false);
                $thumb4=Helper_common::generateThumbnail($image_upload_path, $thumb_name4, $thumb_width, $thumb_height);

                }