php文件上传表单摘自drupal的代码

function upload_form() {
$form = array();
// If this #attribute is not present, upload will fail on submit
$form[#attributes][enctype] = multipart/form-data;
$form[file_upload] = array(
#title => t(Upload file),
#type => file,
);
$form[submit_upload] = array(
#type => submit,
#value => Submit
);
return $form;
}
function upload_submit($form, &$form_state) {
$validators = array();
$dest = file_directory_path();
$file = file_save_upload(file_upload, $validators, $dest);
//$file will be 0 if the upload doesnt exist, or the $dest directory
//isnt writable
if ($file != 0) {
$file->filepath; // 文件相对路径
}
else {
form_set_error(myform, t("Failed to save the file."));
}
}

<form enctype="multipart/form-data" action="upload.php" method="post">
<input type="hidden" name="max_file_size" value="100000">
<input name="userfile" type="file">　　
<input type="submit" value="上传文件">
</form>

function uploadfile($type,$name,$ext,$size,$error,$tmp_name,$targetname,$upload_dir)
{
$MAX_SIZE = 2000000;
$FILE_MIMES = array(image/pjpeg,image/jpeg,image/jpg,image/gif,image/png);
$FILE_EXTS = array(.jpg,.gif,.png,.JPG,.GIF,.PNG);
$file_path = $upload_dir.$targetname;
if(!is_dir($upload_dir))
{
if(!mkdir($upload_dir))
die("文件上传目录不存在并且无法创建文件上传目录");
if(!chmod($upload_dir,0755))
die("文件上传目录的权限无法设定为可读可写");
}
if($size>$MAX_SIZE)
die("上传的文件大小超过了规定大小");
if($size == 0)
die("请选择上传的文件");
if(!in_array($type,$FILE_MIMES) || !in_array($ext,$FILE_EXTS))
die("请上传符合要求的文件类型");
if(!move_uploaded_file($tmp_name, $file_path))
die("复制文件失败，请重新上传");
switch($error)
{
case 0:
return ;
case 1:
die("上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值");
case 2:
die("上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值");
case 3:
die("文件只有部分被上传");
case 4:
die("没有文件被上传");
}
}

<input name="userfile" type="file">

<input name="userfile[]" type="file">
<input name="userfile[]" type="file">
<input name="userfile[]" type="file">