php 文件上传管理系统-php教程-PHP中文网

本篇文章主要介绍php 文件上传管理系统，感兴趣的朋友参考下，希望对大家有所帮助。
代码如下
<?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);
}
?>
总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
php 文件上传管理系统

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