php 登录操作的文件上传管理系统

来源:转载

本文章来给各位同学介绍一个不错的需要登录的php 文件上传管理系统,功能简单有需要了解的同学可参考。

 代码如下 复制代码

<?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
  }
  $_SESSION['yzcode'] = $randcode;
  Imagegif($im);
  ImageDestroy($im);
}
?>




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