PHP development of simple book background management system login complete code

In this section we create a login.php file to display the complete login function code

We created the style.css file earlier and put this CSS file in the same folder. Next, call the CSS style directly.

Introduce the database public file config.php.

<?php
require_once("config.php"); //引入数据库文件
?>
<?php
if($_POST["Submit"])
{
   $username=$_POST["username"];
   $pwd=$_POST["pwd"];
   $code=$_POST["code"];
   if($code<>$_SESSION["auth"])
   {
      echo "<script language=javascript>alert('验证码不正确！');window.location='login.php'</script>";
      ?>
      <?php
      die();
   }
   $SQL ="SELECT * FROM admin where username='$username' and password='$pwd'";
   $rs=mysqli_query($link,$sql);
   if(mysqli_num_rows($rs)==1)
   {
      $_SESSION["pwd"]=$_POST["pwd"];
      $_SESSION["admin"]=session_id();
      echo "<script language=javascript>alert('登陆成功！');window.location='admin_index.php'</script>";
   }
   else
   {
      echo "<script language=javascript>alert('用户名或密码错误！');window.location='login.php'</script>";
      ?>
      <?php
      die();
   }
}
?>
<?php
if($_GET['tj'] == 'out'){
   session_destroy();
   echo "<script language=javascript>alert('退出成功！');window.location='login.php'</script>";
}
?>
<!DOCTYPE html>
<html>
<head>
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
   <title>图书后台管理系统登陆功能</title>
   <!-- 引入CSS样式 -->
   <link rel="stylesheet" type="text/css" href="style.css"/> 
</head>
<body>
<div id="top"> </div>
<form id="frm" name="frm" method="post" action="" onSubmit="return check()">
   <div id="center">
      <div id="center_left"></div>
      <div id="center_middle">
         <div class="user">
            <label>用户名：
               <input type="text" name="username" id="username" />
            </label>
         </div>
         <div class="user">
            <label>密　码：
               <input type="password" name="pwd" id="pwd" />
            </label>
         </div>
         <div class="chknumber">
            <label>验证码：
               <input name="code" type="text" id="code" maxlength="4" class="chknumber_input" />
            </label>
            <img src="verify.php" style="vertical-align:middle" />
         </div>
      </div>
      <div id="center_middle_right"></div>
      <div id="center_submit">
         <div class="button"> <input type="submit" name="Submit" class="submit" value="&nbsp;">
         </div>
         <div class="button"><input type="reset" name="Submit" class="reset" value=""> </div>
      </div>
      <div id="center_middle_right"></div>
   </div>
</form>
<div id="footer"></div>
</body>
</html>

Continuing Learning

new file

<?php require_once("config.php"); //引入数据库文件 ?> <?php if($_POST["Submit"]) { $username=$_POST["username"]; $pwd=$_POST["pwd"]; $code=$_POST["code"]; if($code<>$_SESSION["auth"]) { echo "<script language=javascript>alert('验证码不正确！');window.location='login.php'</script>"; ?> <?php die(); } $sql="select * from admin where username='$username' and password='$pwd'"; $rs=mysqli_query($link,$sql); if(mysqli_num_rows($rs)==1) { $_SESSION["pwd"]=$_POST["pwd"]; $_SESSION["admin"]=session_id(); echo "<script language=javascript>alert('登陆成功！');window.location='admin_index.php'</script>"; } else { echo "<script language=javascript>alert('用户名或密码错误！');window.location='login.php'</script>"; ?> <?php die(); } } ?> <?php if($_GET['tj'] == 'out'){ session_destroy(); echo "<script language=javascript>alert('退出成功！');window.location='login.php'</script>"; } ?> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>图书后台管理系统登陆功能</title>  <link rel="stylesheet" type="text/css" href="style.css"/> </head> <body> <div id="top"> </div> <form id="frm" name="frm" method="post" action="" onSubmit="return check()"> <div id="center"> <div id="center_left"></div> <div id="center_middle"> <div class="user"> <label>用户名： <input type="text" name="username" id="username" /> </label> </div> <div class="user"> <label>密　码： <input type="password" name="pwd" id="pwd" /> </label> </div> <div class="chknumber"> <label>验证码： <input name="code" type="text" id="code" maxlength="4" class="chknumber_input" /> </label> <img src="verify.php" style="vertical-align:middle" /> </div> </div> <div id="center_middle_right"></div> <div id="center_submit"> <div class="button"> <input type="submit" name="Submit" class="submit" value=" "> </div> <div class="button"><input type="reset" name="Submit" class="reset" value=""> </div> </div> <div id="center_middle_right"></div> </div> </form> <div id="footer"></div> </body> </html>

submit Reset Code

Automatic operation

PHP development of simple book background management system login complete code

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