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$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)
{
?>
请登录
}
else
{
?>
文件上传
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！";
}
}
?>
退出登录
}
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 {
$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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