php登录操作的文件上传管理系统

时间：2015-01-23 来源：西部数据作者：西部数据

<?php

$admin_pw="admin";//管理密码

$uploaddir="upload";//上传目录

session_start();

if($_GET['action']=="getcode")

{

  setcode();

  exit();

}

if($_POST['password']==$admin_pw && $_POST['yz']==$_SESSION['yzcode'])

{

  $_SESSION['logined']=$admin_pw;

}

if($_GET['action']=="logout")

{

  $_SESSION['logined']="";

  header("location: ".$_SERVER['PHP_SELF']);

  exit();

}

if($_SESSION['logined']!=$admin_pw)

{

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>请登录</title>

</head>

<body>

<form action="" method="post">

输入密码：<input type="password" name="password" style="width:100px;" /><br />验证字符：<input type="text" style="width:40px;" name="yz" /><a href="#" onclick="document.tzm.src='?action=getcode';"><img src="?action=getcode" alt="验证码" id="tzm" name="tzm" /></a><br /><input type="submit" value="进入管理" />

</form>

</body>

</html>

<?php

}

else

{

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>文件上传</title>

</head>

<body>

<?php

  if($_POST['ac']=="upload")

  {

$fileall=explode('.',$_FILES['file']['name']);

$filetype=$fileall[count($fileall)-1];

$filename=$uploaddir."/".$_FILES['file']['name']."_".rand(1,999999999).".".$filetype;

$fileexists=file_exists($filename);

while($fileexists==true)

{

  $filename=$uploaddir."/".$_FILES['file']['name']."_".rand(1,999999999).".".$filetype;

  $fileexists=file_exists($filename);

}

if(move_uploaded_file($_FILES["file"]["tmp_name"],$filename))

{

  $url="http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];

  echo "文件:".$filename." 上传成功！<br>文件地址：<input type=text style='width:350px;' value=".dirname($url)."/".$filename." /><a href=".dirname($url)."/".$filename." target="_blank">测试</a>";

}

else

{

  echo "文件".$filename."上传失败！";

}

  }

?>

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

选择文件：<input type="file" name="file" id="file" width="100px" /><input type="hidden" name="ac" value="upload" /><input type="submit" value="上传" />

</form>

<p><a href="?action=logout">退出登录</a></p>

</body>

</html>

<?php

}

function setcode()

{

  Header("Content-type: image/gif");

  $border = 0; //是否要边框 1要:0不要

  $how = 4; //验证码位数

  $w = $how*15; //图片宽度

  $h = 20; //图片高度

  $fontsize = 5; //字体大小

  $alpha = "abcdefghijkmnopqrstuvwxyz"; //验证码内容1:字母

  $number = "0123456789"; //验证码内容2:数字

  $randcode = ""; //验证码字符串初始化

  srand((double)microtime()*1000000); //初始化随机数种子

  $im = ImageCreate($w, $h); //创建验证图片

  $bgcolor = ImageColorAllocate($im, 255, 255, 255); //设置背景颜色

  ImageFill($im, 0, 0, $bgcolor); //填充背景色

  if($border)

  {

    $black = ImageColorAllocate($im, 0, 0, 0); //设置边框颜色

    ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//绘制边框

  }

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

  {

    $alpha_or_number = mt_rand(0, 1); //字母还是数字

    $str = $alpha_or_number ? $alpha : $number;

    $which = mt_rand(0, strlen($str)-1); //取哪个字符

    $code = substr($str, $which, 1); //取字符

    $j = !$i ? 4 : $j+15; //绘字符位置

    $color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字符随即颜色

    ImageChar($im, $fontsize, $j, 3, $code, $color3); //绘字符

    $randcode .= $code; //逐位加入验证码字符串

  }//开源代码phpfensi.com

  $_SESSION['yzcode'] = $randcode;

  Imagegif($im);

  ImageDestroy($im);

}

?>