php文件上传类与详解
php 配置中的 upload_tmp_dir 这个参数进行比较,如果文件在这个目录下面,那么 move_uploaded_file 才会进行移动操作,而且这个比较是大小写敏感,/ 在windows 下面也是不一样的,而在php配置文件解析的时候,会调用一个realpath 函数,也就是是说,你在move_uploaded_file 之前.
必须对$file['tmp_name'] = realpath($file['tmp_name']); realpath 一下.
还有一种情况,大家要注意,就是 move_uploaded_file 如果配置成一个无法访问的路径,那么你不管怎么处理,move_uploaded_file 总是不能成功移动文件.
在文件上传的时候,用 move_uploaded_file 这个函数不能移动文件,而用copy 或者 rename 确是可以的.
我也一直很困惑,在文档上,说的比较模糊,就是 move_uploaded_file 这个函数,加了一步检查,检查这个文件是否是有 http post 上传的.
下面我在网上找到一个文件上传类,实例代码如下:
- **文件上传类**/
-
-
- class upload_file
- {
-
- var $upfile_type,$upfile_size,$upfile_name,$upfile;
- var $d_alt,$extention_list,$tmp,$arri;
- var $datetime,$date;
- var $filestr,$size,$ext,$check;
- var $flash_directory,$extention,$file_path,$base_directory;
- var $url;
-
- function upload_file()
- {
-
- $this->set_url("index.php");
- $this->set_extention();
- $this->set_size(50);
- $this->set_date();
- $this->set_datetime();
- $this->set_base_directory("attachmentfile");
- }
-
-
- function set_file_type($upfile_type)
- {
- $this->upfile_type = $upfile_type;
- }
-
-
- function set_file_name($upfile_name)
- {
- $this->upfile_name = $upfile_name;
- }
-
-
- function set_upfile($upfile)
- {
- $this->upfile = $upfile;
- }
-
-
- function set_file_size($upfile_size)
- {
- $this->upfile_size = $upfile_size;
- }
-
-
- function set_url($url)
- {
- $this->url = $url;
- }
-
-
- function get_extention()
- {
- $this->extention = preg_replace('/.*.(.*[^.].*)*/iu','1',$this->upfile_name);
- }
-
-
- function set_datetime()
- {
- $this->datetime = date("ymdhis");
- }
-
-
- function set_date()
- {
- $this->date = date("y-m-d");
- }
-
-
- function set_extention()
- {
- $this->extention_list = "doc|xls|ppt|avi|txt|gif|jpg|jpeg|bmp|png";
- }
-
-
- function set_size($size)
- {
- $this->size = $size;
- }
-
-
- function set_base_directory($directory)
- {
- $this->base_directory = $directory;
- }
-
-
- function set_flash_directory()
- {
- $this->flash_directory = $this->base_directory."/".$this->date;
- }
-
-
- function showerror($errstr="未知错误!"){
- echo "<script language=网页特效>alert('$errstr');location='javascript:history.go(-1);';</script>";
- exit();
- }
-
-
- function go_to($str,$url)
- {
- echo "<script language='javascript'>alert('$str');location='$url';</script>";
- exit();
- }
-
- function mk_base_dir()
- {
- if (! file_exists($this->base_directory)){
- @mkdir($this->base_directory,0777);
- }
- }
-
- function mk_dir()
- {
- if (! file_exists($this->flash_directory)){
- @mkdir($this->flash_directory,0777);
- }
- }
-
-
- function get_compare_extention()
- {
- $this->ext = explode("|",$this->extention_list);
- }
-
-
- function check_extention()
- {
- for($i=0;each($this->ext);$i++)
- {
- if($this->ext[$i] == strtolower($this->extention))
- {
- $this->check = true;
- break;
- }
- }
- if(!$this->check){$this->showerror("正确的扩展名必须为".$this->extention_list."其中的一种!");}
-
- }
-
-
- function check_size()
- {
- if($this->upfile_size > round($this->size*1024))
- {
- $this->showerror("上传附件不得超过".$this->size."kb");
- }
- }
-
- function set_file_path()
- {
- $this->file_path = $this->flash_directory."/".$this->datetime.".".$this->extention;
- }
-
-
- function copy_file()
- {
- if(copy($this->upfile,$this->file_path)){
- print $this->go_to("文件已经成功上传!",$this->url);
- }else {
- print $this->showerror("意外错误,请重试!");
- }
- }
-
-
- function save()
- {
- $this->set_flash_directory();
- $this->get_extention();
- $this->get_compare_extention();
- $this->check_extention();
- $this->check_size();
- $this->mk_base_dir();
- $this->mk_dir();
- $this->set_file_path();
- $this->copy_file();
- }
-
- }
调用方法,实例代码如下,upload.htm @ 表单文件名:
- <html>
- <head>
- <title>文件上传实例</title>
- </head>
- <body>
- <form action="test.php" method="post" enctype="multipart/form-data">
- <table border=0 cellpadding=3 cellspacing=4 width=30%>
- <tr>
- <td width=10% nowrap>附件来源</td>
- <td><input name="src" type="file"/></td>
- </tr>
- <tr>
- <td colspan=2 align=center><input type="submit" value="上传"></td>
- </tr>
- </table>
- </form>
- </body>
- </html>
test.php @ 处理表单文件名,实例代码如下:
- <?php
- include("upload.php"); # 加入类文件
- $f_upload = new upload_other; # 创建对象
- $f_upload->set_file_type($_files['src']['type']); # 获得文件类型
- $f_upload->set_file_name($_files['src']['name']); # 获得文件名称
- $f_upload->set_file_size($_files['src']['size']); # 获得文件尺寸
- $f_upload->set_upfile($_files['src']['tmp_name']); # 服务端储存的临时文件名
- $f_upload->set_size(100); # 设置最大上传kb数
- $f_upload->set_base_directory("uploadimages"); # 文件存储根目录名称
- $f_upload->set_url("up.php"); # 文件上传成功后跳转的文件
- $f_upload->save(); # 保存文件
- ?>
没有在类里做有无文件的验证,大家可以在前台搞定.