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使用一下,代码如下:

<?php
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() , $rename = true) {
        if (!emptyempty($name)) {
            $this->up_name = $name;
            !emptyempty($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！');
            }
        }
        $this->chkupload();
    }
    private function chkupload() {
        if (emptyempty($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($this->up_dir, 0777)) {
                if (!emptyempty($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, '', $file_name);
                            } else {
                                exit('文件上传失败！');
                            }
                        }
                    }
                }
            } else {
                exit('未开启写入权限！');
            }
        } else {
            exit('上传目录创建失败！');
        }
    }
    public function getupload() {
        return emptyempty($this->up_ret) ? false : $this->up_ret;
    }
    function __destruct() {
    }
}
?>

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<input type="file">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.

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