php 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 (! empty empty ( $name )) { $this ->up_name = $name ; ! empty 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 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 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 empty ( $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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