if (!isset($_SESSION)) {
session_start();
}
//檢查SESSION是否啟動
$_SESSION['captcha'] = '';
//設置存放檢查碼的SESSION
//設置定義為圖片
header("Content-type: image/PNG");
/*
imgcode($nums,$width,$high)
設置產生驗證碼圖示的參數
$nums 生成驗證碼個數
$width 圖片寬
$high 圖片高
*/
imgcode(4, 100, 25);
//imgcode的function
function imgcode($nums, $width, $high)
{
//去除了數字0和1 字母小寫O和L，為了避免辨識不清楚
//$str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMOPQRSTUBWXYZ";
$str = "0123456789";
$code = '';
for ($i = 0; $i < $nums; $i++) {
$code .= $str[mt_rand(0, strlen($str) - 1)];
}
$_SESSION['captcha'] = $code;
//建立圖示，設置寬度及高度與顏色等等條件
$image = imagecreate($width, $high);
$black = imagecolorallocate($image, mt_rand(0, 200), mt_rand(0, 200), mt_rand(0, 200));
$border_color = imagecolorallocate($image, 21, 106, 235);
<?php
//====================================================
// FileName: login.php
// Summary: 后台登录入口
// Author: millken(迷路林肯)
// LastModifed:2008-3-9
// copyright (c)2008 millken@gmail.com
//====================================================
include '../common.inc.php';
$imgcode = imgcode();
if (imgcode($checkcode, false)) {
die('ok');
} else {
m_exit($_POST);
}
$tpl = new template(basename(__FILE__, '.php') . '.html');
$tpl->tpl_dir = 'templates/default/';
$tpl->debug = true;
include $tpl->compiledFile();
<title>系统管理登陆</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link rel="stylesheet" href="admin.css" type="text/css"> </head> <body topmargin="10" leftmargin="10" > <form action="login.php?action=login" method="post"> <table class="tableborder2" cellspacing="1" cellpadding="4" width="30%" align="center" > <tr class="head"> <td colspan="2" align="center">后台管理</td> </tr> <tr class="b"> <td width="30%"><b>用户名：</b></td> <td><input type="text" size="20" name="username"></td> </tr> <tr class="b"> <td width="30%"><b>密码：</b></td> <td><input type="password" size="20" name="passwd"></td> </tr> <tr class="b"> <td width="30%"><b>验证码：</b></td> <td><input type="text" class="capital" size="10" name="securitycode"> <?php echo imgcode(); ?> </td> </tr> </table> <br><center><input type="submit" value="提 交"> <input type="reset" value="重置"></center> </form> </body> </html>
if (!isset($_SESSION)) {
session_start();
}
//檢查SESSION是否啟動
$_SESSION['check_word'] = '';
//設置存放檢查碼的SESSION
//設置定義為圖片
header("Content-Type: image/png");
/*
imgcode($nums,$width,$high)
設置產生驗證碼圖示的參數
$nums 生成驗證碼個數
$width 圖片寬
$high 圖片高
*/
imgcode(4, 105, 35);
//imgcode的function
function imgcode($nums, $width, $high)
{
$str = "1234567890";
$code = '';
for ($i = 0; $i < $nums; $i++) {
$code .= $str[mt_rand(0, strlen($str) - 1)];
}
$_SESSION['check_word'] = $code;
//建立圖示，設置寬度及高度與顏色等等條件
$image = imagecreate($width, $high);
$black = imagecolorallocate($image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$border_color = imagecolorallocate($image, 21, 106, 235);
$background_color = imagecolorallocate($image, 235, 236, 237);
//建立圖示背景
