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PHP code implementation of background login (including verification code)
PHP code implementation of background login (including verification code)
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login.html文件
<html>
<title>login in</title>
<body>
<form action="handle_login.php" method="post"/>
用户名：<input type="text" name="username"/><br/>
密码：<input type="password" name="password"/><br/>
验证码：<input type="text" name="imgcode"><img src="code.php" width="200px" height="30px"><br/>
<input type="submit" name="button" value="登陆">
</form>
</body>
</html>
code.php文件
<?php
session_start();//首先要启动session
// Set the content-type
header("Content-type: image/png"); // 告诉浏览器当前文件产生的结果以png形式进行输出
// Create the image
$im = imagecreate(200, 30); // 创建一张宽为200,高为30的画布
// Create some colors
$bg = imagecolorallocate($im, 155, 100, 255); // 给画布加上背景颜色
$white = imagecolorallocate($im, 255, 255, 255); // 三原色白色
//$grey = imagecolorallocate($im, 128, 128, 128);
$black = imagecolorallocate($im, 0, 0, 0); // 黑色
$numer_array = range(0,9); // 生成一个0到9范围的数组
$abc = range('a','z'); // 生成一个a到z范围的数组
$big_abc = range('A','Z'); // 生成一A到Z范围的数组
$big_chars = array_merge($numer_array,$abc,$big_abc); // 将上述三个数组进行合并
$font = 'simsun.ttc'; // 设定字体文件的路径
$myimagecode = '';
for($i=0;$i<4;$i++){
$str = $big_chars[rand(0,61)]; // 从合并后的数组中随机取一个字符
$myimagecode = $myimagecode.$str; //将这个验证码字符窜存入变量myimagecode中
$a=50*$i;
$b=50*($i+1);
imagettftext($im, 20, 0, mt_rand($a,$b), mt_rand(20,30), $black, $font, $str); // 将取出的字符写在画布上
}
$_SESSION['thisimagecode'] = $myimagecode;
for($i=0;$i<200;$i++){
imagesetpixel( $im,mt_rand(0,200),mt_rand(0,30),$white); // 给画布加上点
}
for($i=0;$i<4;$i++){
imageline($im, mt_rand(0,200),mt_rand(0,30), mt_rand(0,200), mt_rand(0,30),$black ); //给画面加上线条
}
imagepng($im); // 将图像以png形式输出
imagedestroy($im); // 将图像资源从内存中销毁,以节约资源
?>
handle_login.php文件
<?php
session_start();
#接受提交过来的用户名及密码
$username = trim($_POST['username']);//用户名
$password = trim($_POST['password']);//密码
$imgcode = strtolower($_POST['imgcode']);//接受从登陆输入框提交过来的验证码并转化为小写；
$myimagecode = strtolower($_SESSION['thisimagecode']) ;//从session中取得验证码并转化为小写；
if($imgcode!=$myimagecode){
echo '请输入正确的验证码';exit;
}
#拿着提交过来的用户名和密码去数据库查找，看是否存在此用户名以及其密码
$link=mysql_connect('localhost','root','123456');
mysql_query('set names utf8');
$re=mysql_select_db('companysystem',$link);
$sql="select *from admin where username = '$username'and password='$password' ";
$result=mysql_query($sql);
$rows=mysql_fetch_assoc($result);
if($rows){
$SESSION['is_login']=$rows['username'];
echo '登陆成功';
}else{
$is_login='';
echo '登陆失败';
}
?>Related recommendations ：
php mysql implements simple login registration and password modification webpage
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