php登录操作的文件上传管理系统
<?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'] != $admin_pw) {
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>请登录</title>
</head>
<body>
<form action="" method="post">
输入密码：<input type="password" name="password" style="width:100px;" /><br />验证字符：<input type="text" style="width:40px;" name="yz" /><a href="#" onclick="document.tzm.src='?action=getcode';"><img src="?action=getcode" alt="验证码" id="tzm" name="tzm" /></a><br /><input type="submit" value="进入管理" />
</form>
</body>
</html>
<?php
} else {
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>文件上传</title>
</head>
<body>
<?php
if ($_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);
}
?>本文地址：http://www.phprm.com/scxz/fs4882.html
转载随意，但请附上文章地址:-)