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。