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PHP code implementation of background login (including verification code)

Apr 24, 2018 pm 02:09 PM
php code verify

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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(&#39;a&#39;,&#39;z&#39;);     // 生成一个a到z范围的数组
$big_abc = range(&#39;A&#39;,&#39;Z&#39;);  // 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 = &#39;simsun.ttc&#39;;  // 设定字体文件的路径
$myimagecode = &#39;&#39;;
for($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[&#39;thisimagecode&#39;] = $myimagecode;
for($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[&#39;username&#39;]);//用户名
$password = trim($_POST[&#39;password&#39;]);//密码
$imgcode = strtolower($_POST[&#39;imgcode&#39;]);//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[&#39;thisimagecode&#39;]) ;//从session中取得验证码并转化为小写;
if($imgcode!=$myimagecode){
     echo &#39;请输入正确的验证码&#39;;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(&#39;localhost&#39;,&#39;root&#39;,&#39;123456&#39;);
mysql_query(&#39;set names utf8&#39;);
$re=mysql_select_db(&#39;companysystem&#39;,$link);
$sql="select *from admin where username = &#39;$username&#39;and password=&#39;$password&#39; ";
$result=mysql_query($sql);
$rows=mysql_fetch_assoc($result);
if($rows){
  $SESSION[&#39;is_login&#39;]=$rows[&#39;username&#39;];
  echo &#39;登陆成功&#39;;
 
}else{
  $is_login=&#39;&#39;;
  echo &#39;登陆失败&#39;;
}
?>
Copy after login

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