<?php
$admin_pw="admin";//管理密碼
$uploaddir="upload";//上傳目錄
session_start();
if($_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>請(qǐng)登錄</title>
</head>
<body>
<form action="" method="post">
輸入密碼：<input type="password" name="password" style="width:100px;" /><br />驗(yàn)證字符：<input type="text" style="width:40px;" name="yz" /><a href="#" onclick="document.tzm.src='?action=getcode';"><img src="?action=getcode" alt="驗(yàn)證碼" id="tzm" name="tzm" /></a><br /><input type="submit" value="進(jìn)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>文件上傳</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." 上傳成功！<br>文件地址：<input type=text style='width:350px;' value=".dirname($url)."/".$filename." /><a href=".dirname($url)."/".$filename." target="_blank">測(cè)試</a>";
 }
 else
 {
 echo "文件".$filename."上傳失?。?;
 }
 }
?>
<form action="" method="post" enctype="multipart/form-data">
選擇文件：<input type="file" name="file" id="file" width="100px" /><input type="hidden" name="ac" value="upload" /><input type="submit" value="上傳" />
</form>
<p><a href="?action=logout">退出登錄</a></p>
</body>
</html>
<?php
}

function setcode()
{
 Header("Content-type: image/gif");
 $border = 0; //是否要邊框 1要:0不要
 $how = 4; //驗(yàn)證碼位數(shù)
 $w = $how*15; //圖片寬度
 $h = 20; //圖片高度
 $fontsize = 5; //字體大小
 $alpha = "abcdefghijkmnopqrstuvwxyz"; //驗(yàn)證碼內(nèi)容1:字母
 $number = "0123456789"; //驗(yàn)證碼內(nèi)容2:數(shù)字
 $randcode = ""; //驗(yàn)證碼字符串初始化
 srand((double)microtime()*1000000); //初始化隨機(jī)數(shù)種子
 $im = ImageCreate($w, $h); //創(chuàng)建驗(yàn)證圖片
 $bgcolor = ImageColorAllocate($im, 255, 255, 255); //設(shè)置背景顏色
 ImageFill($im, 0, 0, $bgcolor); //填充背景色
 if($border)
 {
 $black = ImageColorAllocate($im, 0, 0, 0); //設(shè)置邊框顏色
 ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//繪制邊框
 }
 for($i=0; $i<$how; $i++)
 { 
 $alpha_or_number = mt_rand(0, 1); //字母還是數(shù)字
 $str = $alpha_or_number ? $alpha : $number;
 $which = mt_rand(0, strlen($str)-1); //取哪個(gè)字符
 $code = substr($str, $which, 1); //取字符
 $j = !$i ? 4 : $j+15; //繪字符位置
 $color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字符隨即顏色
 ImageChar($im, $fontsize, $j, 3, $code, $color3); //繪字符
 $randcode .= $code; //逐位加入驗(yàn)證碼字符串
 }
 $_SESSION['yzcode'] = $randcode;
 Imagegif($im);
 ImageDestroy($im);
}
?>

更多學(xué)習(xí)資料請(qǐng)關(guān)注專題《管理系統(tǒng)開發(fā)》。

以上就和大家一起學(xué)習(xí)了需要登錄的php文件上傳管理系統(tǒng)，大家可以根據(jù)自己愛好對(duì)登錄進(jìn)行美化操作，希望大家可以喜歡這篇文章。

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