方法1：
在html表单，放置多个文件选择框， 使用数组名作为组件的名字，如下：
在服务器端我们可以测试一下提交的信息
输出结果：
Array( [upfile] => Array ( [name] => Array ( [0] => C函数速查.chm [1] => JDK_API_1_6中文帮助.CHM ) [type] => Array ( [0] => application/octet-stream [1] => application/octet-stream ) [tmp_name] => Array ( [0] => D:\PHP\xampp2\tmp\phpF7E1.tmp [1] => D:\PHP\xampp2\tmp\phpF7E2.tmp ) [error] => Array ( [0] => 0 [1] => 0 ) [size] => Array ( [0] => 98791 [1] => 36830335 ) ) [upfile_2] => Array ( [name] => Array ( [0] => jquery1.7.2中文手册.chm [1] => jQuery1.8.3中文手册.chm ) [type] => Array ( [0] => application/octet-stream [1] => application/octet-stream ) [tmp_name] => Array ( [0] => D:\PHP\xampp2\tmp\phpF93A.tmp [1] => D:\PHP\xampp2\tmp\phpF93B.tmp ) [error] => Array ( [0] => 0 [1] => 0 ) [size] => Array ( [0] => 306357 [1] => 405941 ) ))
方法2：
在html端为每一个input框给一个不同的name
服务端“print_r($_FILES);” 后，输出的信息：
Array( [upfile_1] => Array ( [name] => C函数速查.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\php2247.tmp [error] => 0 [size] => 98791 ) [upfile_2] => Array ( [name] => JDK_API_1_6中文帮助.CHM [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\php2248.tmp [error] => 0 [size] => 36830335 ) [upfile_3] => Array ( [name] => jquery1.7.2中文手册.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\php23B0.tmp [error] => 0 [size] => 306357 ))
所以，针对下面这个“综合性”上传表单：
服务端接收到的数据为：
Array( [upfile] => Array ( [name] => Array ( [0] => C函数速查.chm [1] => JDK_API_1_6中文帮助.CHM ) [type] => Array ( [0] => application/octet-stream [1] => application/octet-stream ) [tmp_name] => Array ( [0] => D:\PHP\xampp2\tmp\php4440.tmp [1] => D:\PHP\xampp2\tmp\php4441.tmp ) [error] => Array ( [0] => 0 [1] => 0 ) [size] => Array ( [0] => 98791 [1] => 36830335 ) ) [upfile_2] => Array ( [name] => Array ( [0] => jquery1.7.2中文手册.chm [1] => jQuery1.8.3中文手册.chm ) [type] => Array ( [0] => application/octet-stream [1] => application/octet-stream ) [tmp_name] => Array ( [0] => D:\PHP\xampp2\tmp\php459A.tmp [1] => D:\PHP\xampp2\tmp\php459B.tmp ) [error] => Array ( [0] => 0 [1] => 0 ) [size] => Array ( [0] => 306357 [1] => 405941 ) ) [upfile_3] => Array ( [name] => php_manual_zh.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\php459C.tmp [error] => 0 [size] => 31019182 ) [upfile_4] => Array ( [name] => TIPI深入理解PHP内核_2014-04-29_V0.8.3.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\php4687.tmp [error] => 0 [size] => 1304181 ))
问题：上面的 $_FILES 信息有点乱，可以写个函数/方法来格式化下，参考代码如下：
function format_files($files){ $fileArray = array(); $n = 0; foreach ($files as $key => $file) { if (is_array($file['name'])) { $keys = array_keys($file); $count = count($file['name']); for ($i = 0; $i < $count; $i++) { $fileArray[$n]['key'] = $key; foreach ($keys as $_key) { $fileArray[$n][$_key] = $file[$_key][$i]; } $n++; } } else { $fileArray[$n] = $file; $fileArray[$n]['key'] = $key; $n++; } } return $fileArray;} 经过 format_files($_FILES); 处理后，结果被格式化为：
Array( [0] => Array ( [key] => upfile [name] => C函数速查.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\phpF27F.tmp [error] => 0 [size] => 98791 ) [1] => Array ( [key] => upfile [name] => JDK_API_1_6中文帮助.CHM [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\phpF280.tmp [error] => 0 [size] => 36830335 ) [2] => Array ( [key] => upfile_2 [name] => jquery1.7.2中文手册.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\phpF3C9.tmp [error] => 0 [size] => 306357 ) [3] => Array ( [key] => upfile_2 [name] => jQuery1.8.3中文手册.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\phpF3CA.tmp [error] => 0 [size] => 405941 ) [4] => Array ( [name] => php_manual_zh.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\phpF3CB.tmp [error] => 0 [size] => 31019182 [key] => upfile_3 ) [5] => Array ( [name] => TIPI深入理解PHP内核_2014-04-29_V0.8.3.chm [type] => application/octet-stream [tmp_name] => D:\PHP\xampp2\tmp\phpF4C6.tmp [error] => 0 [size] => 1304181 [key] => upfile_4 ))
延伸阅读：