php+ajax实现带进度条的上传图片功能【附demo源码下载】

本文实例讲述了php+ajax实现带进度条的上传图片功能。分享给大家供大家参考，具体如下：

运行效果图如下：

代码如下：

<?php
if(isset($_FILES["FileInput"]) && $_FILES["FileInput"]["error"]== UPLOAD_ERR_OK)
{
  ############ Edit settings ##############
  $UploadDirectory  = "F:/Websites/file_upload/uploads/"; //specify upload directory ends with / (slash)
  ##########################################
  /*
  Note : You will run into errors or blank page if "memory_limit" or "upload_max_filesize" is set to low in "php.ini".
  Open "php.ini" file, and search for "memory_limit" or "upload_max_filesize" limit
  and set them adequately, also check "post_max_size".
  */
  //check if this is an ajax request
  if (!isset($_SERVER["HTTP_X_REQUESTED_WITH"])){
    die();
  }
  //Is file size is less than allowed size.
  if ($_FILES["FileInput"]["size"] > 5242880) {
    die("File size is too big!");
  }
  //allowed file type Server side check
  switch(strtolower($_FILES["FileInput"]["type"]))
    {
      //allowed file types
      case "image/png":
      case "image/gif":
      case "image/jpeg":
      case "image/pjpeg":
      case "text/plain":
      case "text/html": //html file
      case "application/x-zip-compressed":
      case "application/pdf":
      case "application/msword":
      case "application/vnd.ms-excel":
      case "video/mp4":
        break;
      default:
        die("Unsupported File!"); //output error
  }
  $File_Name     = strtolower($_FILES["FileInput"]["name"]);
  $File_Ext      = substr($File_Name, strrpos($File_Name, ".")); //get file extention
  $Random_Number   = rand(0, 9999999999); //Random number to be added to name.
  $NewFileName    = $Random_Number.$File_Ext; //new file name
  if(move_uploaded_file($_FILES["FileInput"]["tmp_name"], $UploadDirectory.$NewFileName ))
    {
    die("Success! File Uploaded.");
  }else{
    die("error uploading File!");
  }
}
else
{
  die("Something wrong with upload! Is "upload_max_filesize" set correctly?");
}

完整实例代码点击此处本站下载。

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希望本文所述对大家PHP程序设计有所帮助。