PHP实现多图片上传类实例

本文所述为一个实用的PHP多图片文件上传类，其支持gif、jpg、jpeg、pjpeg、png格式的多图片上传功能，类中还可限制图片类型、上传图片的大小、设置上传目录、一些提交判断等功能。此外该类并不局限于图片的上传，也可以上传TXT/RAR等文件类型，只是需要对代码进行一下修改，感兴趣的读者可以自己尝试一下。

php多图片上传类完整功能代码如下：

    <?php
    class more_file_upload{
      const FILE_PATH = '/uploadfile/'; //默认文件上传的目录，请自行修改
      var file_type;
      var file_type_array;
      var file_type_real_array;
      var file_type_string;
      var file_name;
      var file_size;
      var file_tmp_name;
      var file_error;
      var handledate;
      static totalsize = 0;
      function __construct(file_name, file_error, file_size, file_tmp_name, file_type){
        this -> handledate = date('m-d-Y');
        if (!empty(file_name)){
          this -> file_name = file_name;
          this -> file_error = file_error;
          this -> file_size = file_size;
          this -> file_tmp_name = file_tmp_name;
          this -> file_type = file_type;
          this -> file_type_array = array('/', 'image/gif', 'image/jpg', 'image/jpeg', 'image/pjpeg', 'image/png');
          this -> file_type_real_array = array(0.1, 'jpg' => 74707370, 'gif' => 7173, 'bmp' => 6677, 'png' => 807871);
          this -> show_execute_message(this -> file_error, this -> file_name, this -> file_type, this -> file_size);
          }
        }
      function __destruct(){
        this -> file_name = NULL;
        this -> file_error = NULL;
        this -> file_size = NULL;
        this -> file_tmp_name = NULL;
        this -> file_type = NULL;
        self :: totalsize = 0;
        }
      function show_execute_message(smfileerror, smfilename, smfiletype, smfilesize){
        if(smfileerror > 0){
          switch (smfileerror){
          case 1: smfilemessage = '<strong>文件超过服务器的约定大小！</strong>';
            break;
          case 2: smfilemessage = '<strong>文件超过指定的文件大小！</strong>';
            break;
          case 3: smfilemessage = '<strong>文件只上传了部分！</strong>';
            break;
          case 4: echo "this->file_name " . '文件上传失败！<br/>';
            break;
            }
          self :: __destruct();
          }else{
          smfiletypeflag = array_search(smfiletype, this -> file_type_array);
          // 进行真实格式验证
          if(smfiletypeflag != false){
            file = fopen(this -> file_tmp_name, "rb");
            bin = fread(file, 10);
            fclose(file);
            strInfo = @unpack("c10chars", bin);
            typeCode = intval(strInfo['chars1'] . strInfo['chars2']);
            smfiletypeflag = array_search(typeCode, this -> file_type_real_array);
            if(smfiletypeflag == false){ // 判断是否是png图片
              typeCode = intval(strInfo['chars2'] . strInfo['chars3'] . strInfo['chars4']);
              smfiletypeflag = array_search(typeCode, this -> file_type_real_array);
              if(smfiletypeflag == false){ // 判断是否是jpg图片
                $typeCode = intval(strInfo['chars7'] . strInfo['chars8'] . strInfo['chars9'] . strInfo['chars10']);
                smfiletypeflag = array_search(typeCode, this -> file_type_real_array);
                }
              }
            }
          if($smfiletypeflag == false){
            $smfilemessage = '<strong>文件类型不对，请核实！</strong>';
            self :: __destruct();
            }else{
            $resflag = $this -> move_file($this -> file_tmp_name, this -> file_name);
            if (resflag == 1){
              $smfilemessage = '文件上传成功！';
              self :: totalsize += intval($smfilesize);
              self :: __destruct();
              }else{
              $smfilemessage = '<strong>文件上传失败！</strong>';
              self :: __destruct();
              }
            }
          }
        $smfilesizeformat = $this -> size_BKM(smfilesize);
        echo '<tr>
    <td align="left" >' . smfilename . '</td>
    <td align="center" >' . smfiletype . '</td>
    <td align="center" >' . smfilesizeformat . '</td>
    <td align="center" >' . smfilemessage . '</td>
    </tr>';
        }
      function move_file(mvfiletmp, mvfilename){ // 移动文件
        mvfilenamearr = explode('.', basename(mvfilename));
        mvfilenamearr[0] = this -> rand_string();
        mvfilename = implode('.', mvfilenamearr);
        if (is_uploaded_file(mvfiletmp)){
          uploadfile = self :: FILE_PATH . "mvfilename";
          result = move_uploaded_file(mvfiletmp, uploadfile);
          return result;
          }
        }
      function rand_string(){
        string = md5(uniqid(rand() . microtime()));
        return string;
        }
      function size_BKM(size){ // B/KB/MB单位转换
        if(size < 1024)
        {
          size_BKM = (string)size . " B";
          }
        elseif(size < (1024 * 1024))
          {
          size_BKM = number_format((double)(size / 1024), 1) . " KB";
          }else
          {
          size_BKM = number_format((double)(size / (1024 * 1024)), 1) . " MB";
          }
        return size_BKM;
        }
      }
    ?>

读者可以将上述代码复制到PHP文件中，并保存文件名为：more_upload_file.class.php，在使用时include该文件即可。