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php教程 多文件上传的处理方法
关于多文件上传我们讲过很多了，下面是一个简单的普通form多文件上传类了，需要的朋友可以下载试用一下。
class upload {
public $up_ext=array(), $up_max=5210, $up_dir;
private $up_name, $up_rename=true, $up_num=0, $up_files=array(), $up_ret=array();
function __construct($name, $ext=array(), $rename=true) {
if (!empty($name)) {
$this->up_name = $name;
!empty($ext) && $this->up_ext = $ext;
$this->up_rename = $rename;
$this->up_dir = website_dirroot.
$globals["cfg_upload_path"];
$this->initupload();
} else {
exit("upload文件域名称为空，初始化失败！");
}
}
private function initupload() {
if (is_array($_files[$this->up_name])) {
$up_arr = count($_files[$this->up_name]);
$up_all = count($_files[$this->up_name], 1);
$up_cnt = ($up_all - $up_arr) / $up_arr;
for ($i = 0; $i < $up_cnt; $i ++) {
if ($_files[$this->up_name]["error"][$i] != 4) {
$this->up_files[] = array(
"tmp_name" => $_files[$this->up_name]["tmp_name"][$i],
"name" => $_files[$this->up_name]["name"][$i],
"type" => $_files[$this->up_name]["type"][$i],
"size" => $_files[$this->up_name]["size"][$i],
"error" => $_files[$this->up_name]["error"][$i]
);
}
}
$this->up_num = count($this->up_files);
} else {
if (isset($_files[$this->up_name])) {
$this->up_files = array(
"tmp_name" => $_files[$this->up_name]["tmp_name"],
"name" => $_files[$this->up_name]["name"],
"type" => $_files[$this->up_name]["type"],
"size" => $_files[$this->up_name]["size"],
"error" => $_files[$this->up_name]["error"]
);
$this->up_num = 1;
} else {
exit("没找找到需要upload的文件！");
}
}
$this->chkupload();
}
private function chkupload() {
if (empty($this->up_ext)) {
$up_mime = array("image/wbmp", "image/bmp", "image/gif", "image/pjpeg", "image/x-png");
foreach ($this->up_files as $up_file) {
$up_allw = false;
foreach ($up_mime as $mime) {
if ($up_file["type"] == $mime) {
$up_allw = true; break;
}
}
!$up_allw && exit("不允许上传".$up_file["type"]."格式的文件！");
if ($up_file["size"] / 1024 > $this->up_max) {
exit("不允许上传大于 ".$this->up_max."k 的文件！");
}
}
} else {
foreach ($this->up_files as $up_file) {
$up_ext = end(explode(".", $up_file["name"]));
$up_allw = false;
foreach ($this->up_ext as $ext) {
if ($up_ext == $ext) {
$up_allw = true; break;
}
}
!$up_allw && exit("不允许上传.".$up_ext."格式的文件！");
if ($up_file["size"] / 1024 > $this->up_max) {
exit("不允许上传大于 ".$this->up_max."k 的文件！");
}
}
}
$this->uploading();
}
private function uploading() {
if (io::dircreate($this->up_dir)) {
if (chmod($this->up_dir, 0777)) {
if (!empty($this->up_files)) {
foreach ($this->up_files as $up_file) {
if (is_uploaded_file($up_file["tmp_name"])) {
$file_name = $up_file["name"];
if ($this->up_rename) {
$file_ext = end(explode(".", $file_name));
$file_rnd = substr(md5(uniqid()), mt_rand(0, 26), 6);
$file_name = date("ymdhis")."_".$file_rnd.".".$file_ext;
}
$file_name = $this->up_dir."/".$file_name;
if (move_uploaded_file($up_file["tmp_name"], $file_name)) {
$this->up_ret[] = str_replace(website_dirroot, "", $file_name);
} else {
exit("文件上传失败！");
}
}
}
}
} else {
exit("未开启写入权限！");
}
} else {
exit("上传目录创建失败！");
}
}
public function getupload() {
return empty($this->up_ret) ? false : $this->up_ret;
}
function __destruct() {}
}
?>
于大量文件或大体积文件的情况可以考虑调用组件解决（如前文提到的swfupload组件）。然而有些情况只需要传递几个文件，而且文件体积并不太大，这种情况下使用组件则有点牛刀杀鸡的感觉，通过html自带的表单就可以实现需要的功能，关键在于后台接收程序的处理。
php处理上传做的很方便，上传文件的信息通过服务器自动处理到$_files数组中，开发者只需要使用的内置处理函数简单操作就可以啦。asp教程开发者则没有这么幸运，官方并没有提供直接的处理方法，需要开发者自己设计，这时就需要开发者了解iis对enctype="multipart/form-data"表单的处理方式，iis把enctype="multipart/form-data"表单提交的数据存储成二进制数据，以二进制格式返回给开发者，开发者则需要通过lenb、midb的字节处理函数来分析获取的上传内容，客户端发送的具体表单数据格式，可以了解下http rfc1867协议传输格式方面的知识。