<table>

            <form method="post" action="add_back.php" enctype="multipart/form-data">

                  <tr>

                    <th>作品名</th>

                    <td><input type="text" style="width:500px; height:30px;" name="w_name"/></td>

                  </tr>

                  <tr>

                    <th>压缩包</th>

                    <td><input type="file" name="apk_url"/></td>

                  </tr>

                  <tr>

                    <th>源码压缩包</th>

                    <td><input type="file" name="zip_url"/></td>

                  </tr>

                  <tr>

                    <th>预览图片</th>

                    <td><input type="file" name="img_url"/></td>

                  </tr>

                  <tr>

                    <th>简介</th>

                    <td><textarea name="about" style="width:500px;height:150px;"></textarea></td>

                  </tr>

                  <tr>

                      <th></th>

                    <td><input name="Fruit" type="checkbox" value="mztk" style="width:40px;" />我已阅读并同意<a href="#">免责条款</a></td>

                  </tr>

                  <tr>

                      <td></td>

                    <td><input class="sc" type="submit" value="上传" />  </td>

                  </tr>

            </form>

        </table>

<?php

        function GetRandStr($len)

        {

            $chars = array(

                "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",

                "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",

                "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",

                "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",

                "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",

                "3", "4", "5", "6", "7", "8", "9"

            );

            $charsLen = count($chars) - 1;

            shuffle($chars);

            $output = "";

            for ($i=0; $i<$len; $i++)

            {

                $output .= $chars[mt_rand(0, $charsLen)];

            }

            return $output;

        } 

        error_reporting(0); //不会报错

        session_start();

        $u_id = $_SESSION["id"];//获取当前用户ID

        $apk_file = "../apk/";

        $zip_file = "../zip/";//你可以加上，文件类型，大小等判断

        $img_file = "../img/";//设置文件保存目录 注意包含

        $time = date('Y-m-d H:i:s',time());//文件名加上时间码

        $s = str_replace(' ', '', $time);//去掉空格

        $s = str_replace(':','',$s);//去掉：

        $btime = date('YmdHis',time());//文件名加上时间码

        $name = $_POST['w_name'];    //名称

        $about = $_POST['about'];    //关于

        $apk = $_FILES['apk_url'][name];//获取文件名

        $zip = $_FILES['zip_url'][name];//获取文件名

        $img = $_FILES['img_url'][name];//获取文件名

        $apk = substr($apk, -4);//取文件后缀

        $zip = substr($zip, -4);

        $img = substr($img, -4); 

        $name = GetRandStr(5);

        $apk = $btime.$name.$apk ;//存储文件名=时间+随机符+后缀

        $zip = $btime.$name.$zip ;

        $img = $btime.$name.$img ;

        //echo $apk;

        //$_FILES['img']['tmp_name'],存的文件夹.存的名字

          if(

            move_uploaded_file($_FILES['apk_url']['tmp_name'], $apk_file.$apk) &&

            move_uploaded_file($_FILES['zip_url']['tmp_name'], $zip_file.$zip) &&

            move_uploaded_file($_FILES['img_url']['tmp_name'], $img_file.$img) ){

        //echo "<center>您的文件已经上传完毕 上传图片预览: </center><br><center><img src='$img_file$img' height='200px' width='300px'></center>";

        echo "保存成功!";

        //插入数据库

        include('../mysql.php');//连接数据库

        session_start();        //获取当前用户

        $u_id = $_SESSION["id"];

        //echo $u_id;

        //echo "<br/>";

        //echo $name;

        //echo "<br/>";

        //echo $about;

        //echo "<br/>";

        //echo "第一个路径：$apk_file$apk";

        //echo "<br/>";

        //echo "第二个路径：$zip_file$zip";

        //echo "<br/>";

        //echo "第三个路径：$img_file$img";

        //echo "<br/>";

        $sql = "INSERT INTO word(w_id,u_id,w_name,apk_url,zip_url,img_url,about,w_time)VALUES('$btime$u_id','$u_id','$name','$apk_file$apk','$zip_file$zip','$img_file$img','$about','$time')";

        if(mysql_query($sql,$conn)){

            echo '写入数据库成功!<a href="user_zuoping.php">返回作品</a>';

        } else {

            echo '写入数据库失败,已删除保存文件！<a href="javascript:history.back(-1);">返回</a>';

            unlink ($apk_file.$apk);

            unlink ($zip_file.$zip);

            unlink ($img_file.$img);

        }

          }else{

              echo '保存失败!<a href="javascript:history.back(-1);">返回</a>';

            //$myfile路径如：zip/2015-09-16142918 s.jpg

            unlink ($apk_file.$apk);

            unlink ($zip_file.$zip);

            unlink ($img_file.$img);

            }

              ?>