php需登录的文件上传管理系统

<&＃63;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)
{
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输入密码：
验证字符：




<&＃63;php
}
else
{
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<&＃63;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！
文件地址：测试";
 }
 else
 {
 echo "文件".$filename."上传失败！";
 }
 }
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选择文件：

退出登录


<&＃63;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 &＃63; $alpha : $number;
 $which = mt_rand(0, strlen($str)-1); //取哪个字符
 $code = substr($str, $which, 1); //取字符
 $j = !$i &＃63; 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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