關于多文件上傳我們講過很多了,下面是一個簡單的普通form多文件上傳類了,需要的朋友可以下載使用一下,代碼如下:

1. <?php 
2.     
3.        class upload { 
4.              public $up_ext=array(), $up_max=5210, $up_dir; 
5.              private $up_name, $up_rename=true, $up_num=0, $up_files=array(), $up_ret=array(); 
6.  
7.              function __construct($name, $ext=array(), $rename=true) { 
8.                  if (!emptyempty($name)) { 
9.                      $this->up_name = $name; 
10.                      !emptyempty($ext) && $this->up_ext = $ext; 
11.                      $this->up_rename = $rename; 
12.                      $this->up_dir = website_dirroot. 
13.                                      $globals['cfg_upload_path'];                 
14.                      $this->initupload(); 
15.                  } else { 
16.                      exit('upload文件域名稱為空，初始化失??！'); 
17.                  } 
18.              } 
19.  
20.              private function initupload() { 
21.                  if (is_array($_files[$this->up_name])) { 
22.                      $up_arr = count($_files[$this->up_name]); 
23.                      $up_all = count($_files[$this->up_name], 1); 
24.                      $up_cnt = ($up_all - $up_arr) / $up_arr; 
25.                      for ($i = 0; $i < $up_cnt; $i ++) { 
26.                           if ($_files[$this->up_name]['error'][$i] != 4) { 
27.                               $this->up_files[] = array( 
28.                                   'tmp_name' => $_files[$this->up_name]['tmp_name'][$i], 
29.                                   'name' => $_files[$this->up_name]['name'][$i], 
30.                                   'type' => $_files[$this->up_name]['type'][$i], 
31.                                   'size' => $_files[$this->up_name]['size'][$i], 
32.                                   'error' => $_files[$this->up_name]['error'][$i] 
33.                               ); 
34.                           } 
35.                      } 
36.                      $this->up_num = count($this->up_files); 
37.                  } else { 
38.                      if (isset($_files[$this->up_name])) { 
39.                          $this->up_files = array( 
40.                               'tmp_name' => $_files[$this->up_name]['tmp_name'], 
41.                               'name' => $_files[$this->up_name]['name'], 
42.                               'type' => $_files[$this->up_name]['type'], 
43.                               'size' => $_files[$this->up_name]['size'], 
44.                               'error' => $_files[$this->up_name]['error'] 
45.                          ); 
46.                          $this->up_num = 1; 
47.                      } else { 
48.                          exit('沒找找到需要upload的文件！'); 
49.                      } 
50.                  } 
51.  
52.                  $this->chkupload(); 
53.              } 
54.  
55.              private function chkupload() { 
56.                  if (emptyempty($this->up_ext)) { 
57.                      $up_mime = array('image/wbmp', 'image/bmp', 'image/gif', 'image/pjpeg', 'image/x-png'); 
58.                      foreach ($this->up_files as $up_file) { 
59.                          $up_allw = false; 
60.                          foreach ($up_mime as $mime) { 
61.                              if ($up_file['type'] == $mime) { 
62.                                  $up_allw = true; break; 
63.                              } 
64.                          }  
65.                          !$up_allw && exit('不允許上傳'.$up_file['type'].'格式的文件！'); 
66.  
67.                          if ($up_file['size'] / 1024 > $this->up_max) { 
68.                              exit('不允許上傳大于 '.$this->up_max.'k 的文件！'); 
69.                          } 
70.                      }  
71.                  } else { 
72.                      foreach ($this->up_files as $up_file) { 
73.                          $up_ext = end(explode('.', $up_file['name'])); 
74.  
75.                          $up_allw = false; 
76.                          foreach ($this->up_ext as $ext) {                              
77.                              if ($up_ext == $ext) { 
78.                                  $up_allw = true; break; 
79.                              } 
80.                          } 
81.                          !$up_allw && exit('不允許上傳.'.$up_ext.'格式的文件！'); 
82.  
83.                          if ($up_file['size'] / 1024 > $this->up_max) { 
84.                              exit('不允許上傳大于 '.$this->up_max.'k 的文件！'); 
85.                          } 
86.                      } 
87.                  } 
88.  
89.                  $this->uploading(); 
90.              } 
91.  
92.              private function uploading() { 
93.                  if (io::dircreate($this->up_dir)) { 
94.                      if (chmod($this->up_dir, 0777)) { 
95.                          if (!emptyempty($this->up_files)) { 
96.                              foreach ($this->up_files as $up_file) { 
97.                                  if (is_uploaded_file($up_file['tmp_name'])) { 
98.                                      $file_name = $up_file['name']; 
99.                                      if ($this->up_rename) { 
100.                                          $file_ext = end(explode('.', $file_name)); 
101.                                          $file_rnd = substr(md5(uniqid()), mt_rand(0, 26), 6);  
102.                                          $file_name = date('ymdhis').'_'.$file_rnd.'.'.$file_ext; 
103.                                      }  
104.                                      $file_name = $this->up_dir.'/'.$file_name; 
105.  
106.                                      if (move_uploaded_file($up_file['tmp_name'], $file_name)) { 
107.                                          $this->up_ret[] = str_replace(website_dirroot, '', $file_name); 
108.                                      } else { 
109.                                          exit('文件上傳失敗！'); 
110.                                      } 
111.                                  } 
112.                              } 
113.                          } 
114.                      } else { 
115.                          exit('未開啟寫入權限！'); 
116.                      } 
117.                  } else { 
118.                      exit('上傳目錄創建失??！'); 
119.                  } 
120.              } 
121.  
122.              public function getupload() { 
123.                  return emptyempty($this->up_ret) ? false : $this->up_ret; 
124.              } 
125.  
126.              function __destruct() {} 
127.        } 
128. ?> 

大量文件或大體積文件的情況可以考慮調用組件解決（如前文提到的swfupload組件）,然而有些情況只需要傳遞幾個文件,而且文件體積并不太大,這種情況下使用組件則有點牛刀殺雞的感覺,通過html自帶的<input type="file">表單就可以實現需要的功能,關鍵在于后臺接收程序的處理.

php處理上傳做的很方便,上傳文件的信息通過服務器自動處理到$_files數組中,開發者只需要使用的內置處理函數簡單操作就可以啦。asp教程開發者則沒有這么幸運,官方并沒有提供直接的處理方法,需要開發者自己設計,這時就需要開發者了解iis對enctype="multipart/form-data"表單的處理方式,iis把enctype="multipart/form-data"表單提交的數據存儲成二進制數據,以二進制格式返回給開發者，開發者則需要通過lenb、midb的字節處理函數來分析獲取的上傳內容,客戶端發送的具體表單數據格式,可以了解下http rfc1867協議傳輸格式方面的知識.