PHP 文件上传类

FileUpload. class.php

其中用到了两个常量，可在网站配置文件中定义：

define('ROOT_PATH',dirname(__FILE__)); //网站根目录、

define('UPDIR','/uploads/'); //上传主目录

<?php  
    //上传文件类  
    class FileUpload {  
       private $error;   //错误代码  
       private $maxsize;  //表单最大值  
       private $type;    //类型  
       private $typeArr = array('image/jpeg','image/pjpeg','image/png','image/x-png','image/gif');  //类型合集  
       private $path;    //目录路径  
       private $today;   //今天目录  
       private $name;   //文件名  
       private $tmp;    //临时文件  
       private $linkpath;  //链接路径  
       private $linktotay;  //今天目录（相对）  
   
       //构造方法，初始化  
       public function __construct($_file,$_maxsize) {  
              $this->error = $_FILES[$_file]['error'];  
              $this->maxsize = $_maxsize / 1024;  
              $this->type = $_FILES[$_file]['type'];  
              $this->path = ROOT_PATH.UPDIR;  
              $this->linktotay = date('Ymd').'/';  
              $this->today = $this->path.$this->linktotay;  
              $this->name = $_FILES[$_file]['name'];  
              $this->tmp = $_FILES[$_file]['tmp_name'];  
              $this->checkError();  
              $this->checkType();  
              $this->checkPath();  
              $this->moveUpload();  
       }  
   
       //返回路径  
       public function getPath() {  
              $_path = $_SERVER["SCRIPT_NAME"];  
              $_dir = dirname(dirname($_path));  
              if ($_dir == '\\') $_dir = '/';  
              $this->linkpath = $_dir.$this->linkpath;  
              return $this->linkpath;  
       }  
   
       //移动文件  
       private function moveUpload() {  
              if (is_uploaded_file($this->tmp)) {  
                 if (!move_uploaded_file($this->tmp,$this->setNewName())) {  
                        Tool::alertBack('警告：上传失败！');  
                 }  
              } else {  
                 Tool::alertBack('警告：临时文件不存在！');  
              }  
       }  
   
       //设置新文件名  
       private function setNewName() {  
              $_nameArr = explode('.',$this->name);  
              $_postfix = $_nameArr[count($_nameArr)-1];  
              $_newname = date('YmdHis').mt_rand(100,1000).'.'.$_postfix;  
              $this->linkpath = UPDIR.$this->linktotay.$_newname;  
              return $this->today.$_newname;  
       }  
   
       //验证目录  
       private function checkPath() {  
              if (!is_dir($this->path) || !is_writeable($this->path)) {  
                 if (!mkdir($this->path)) {  
                        Tool::alertBack('警告：主目录创建失败！');  
                 }  
              }  
              if (!is_dir($this->today) || !is_writeable($this->today)) {  
                 if (!mkdir($this->today)) {  
                        Tool::alertBack('警告：子目录创建失败！');  
                 }  
              }  
       }  
   
       //验证类型  
       private function checkType() {  
              if (!in_array($this->type,$this->typeArr)) {  
                 Tool::alertBack('警告：不合法的上传类型！');  
              }  
       }  
   
       //验证错误  
       private function checkError() {  
              if (!empty($this->error)) {  
                 switch ($this->error) {  
                        case 1 :  
                           Tool::alertBack('警告：上传值超过了约定最大值！');  
                           break;  
                        case 2 :  
                           Tool::alertBack('警告：上传值超过了'.$this->maxsize.'KB！');  
                           break;  
                        case 3 :  
                           Tool::alertBack('警告：只有部分文件被上传！');  
                           break;  
                        case 4 :  
                           Tool::alertBack('警告：没有任何文件被上传！');  
                           break;  
                        default:  
                           Tool::alertBack('警告：未知错误！');  
                 }  
              }  
       }  
    }  
?>  
 
其中，用到了一个静态工具类 Tool.class.php，代码如下：   
Tool.class.php
 

<?php  
   class Tool {  
    
          //弹窗返回  
          static public function alertBack($_info) {  
             echo "<script type='text/javascript'>alert('$_info');history.back();</script>";  
             exit();  
          }         //弹窗赋值关闭  
          static public function alertOpenerClose($_info,$_path) {  
             echo "<script type='text/javascript'>alert('$_info');</script>";  
             echo "<script type='text/javascript'>opener.document.content.thumbnail.value='$_path';</script>";  
             echo "<script type='text/javascript'>opener.document.content.pic.style.display='block';</script>";  
             echo "<script type='text/javascript'>opener.document.content.pic.src='$_path';</script>";  
             echo "<script type='text/javascript'>window.close();</script>";  
             exit();  
          }  }  
?>  
 
下面进行一个实例演示，请看下面的步骤：
1、先创建一个 index.php 页面，做一个表单
index.php

[html] 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "<a href="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd</a>">  
<html xmlns="<a href="http://www.w3.org/1999/xhtml">http://www.w3.org/1999/xhtml</a>">  
    <head>  
          <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
          <title>main</title>  
   </head>  
   <body>  
          <form name="content" method="post" action="?action=add">  
         <input type="text" name="thumbnail" class="text" readonly="readonly" /> <input type="button" value="上传" onclick="centerWindow('./upfile.html','upfile','400','100')" /> <img name="pic" style="display:none;" /> ( * 必须是jpg,gif,png，并且200k内) <br />  
          </form>  
   </body>  

</html>  

2、创建 upfile.html 文件，建立表单提交到 upload.php.

upfile.html
[html] view plaincopy
<p><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "<a href="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd</a>">  
<html xmlns="<a href="http://www.w3.org/1999/xhtml">http://www.w3.org/1999/xhtml</a>">  
    <head>  
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
        <title>上传图片</title>  
    </head>  
    <body></p><p>     <form method="post" action="./upload.php" enctype="multipart/form-data" style="text-align:center;margin:30px;">  
       <input type="hidden" name="MAX_FILE_SIZE" value="204800" />  
       <input type="file" name="pic" />  
        <input type="submit" name="send" value="确定上传" />  
</form></p><p></body>  
</html></p>  
3、通过 upload.php 文件调用文件上传类实现上传，并且把路径赋给 input 标签和显示图片

<?php  
    require 'FileUpload.class.php';  
    if (isset($_POST['send'])) {  
       $_fileupload = new FileUpload('pic',$_POST['MAX_FILE_SIZE']);  
       $_path = $_fileupload->getPath();  
  
       Tool::alertOpenerClose('文件上传成功！',$_path);  
    } else {  
        Tool::alertBack('警告：文件过大或者其他未知错误导致浏览器崩溃！');  
    }  
?>