如何暂停php循环处理并显示响应然后继续处理？

Question

我在图像/视频上传php脚本中有一个foreach循环。如果用户同时上传视频和图像，我想在图像上传完成后立即显示响应。（使用dropzone.js并行上传）。我怎么能这样做？下面我给出了一个粗略的代码结构，因为它非常大。

<?php
function getExtension($str)
{
    //Function for get extension of upload file array
}

$valid_img_formats = array("jpg", "png", "gif", "bmp","jpeg");
$valid_vid_formats = array("avi", "mp4", "flv", "vob");

if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST") 
{
  count=0
  foreach ($_FILES['file']['name'] as $name => $value)
  {  
   ...
   $ext = strtolower($ext);
   if(in_array($ext,$valid_img_formats))
    {
       if ( count( $_FILES['file']['name'] ) == $count ) 
             {
               //image moving to filesystem and showing response using database   
             }  
    }
    elseif(in_array($ext,$valid_vid_formats ))
    {
       if ( count( $_FILES['file']['name'] ) == $count ) 
             {
               //video moving to filesystem and showing response using database   
             }   
    }   
    else
    {
      echo "invalid file";
    }
  } 
} 
?>

我可以使用下面给出的代码获取上传数组中的图像文件数量（$ img_count_sum）。我不知道如何使用它并且它有意义吗？

$upload_array = $_FILES['file']['name'];    
$img_ext = implode('.', $upload_array);
$img_count_jpg = substr_count($img_ext, 'jpg');
$img_count_jpeg = substr_count($img_ext, 'jpeg');
$img_count_png = substr_count($img_ext, 'png');
$img_count_bmp = substr_count($img_ext, 'bmp');
$img_count_gif = substr_count($img_ext, 'gif');
$img_count_sum_array = array($img_count_jpg,$img_count_jpeg,$img_count_png,$img_count_bmp,$img_count_gif);
$img_count_sum = array_sum($img_count_sum_array);