Développement PHP d'un système de gestion d'arrière-plan de livre simple, code complet de connexion

Dans cette section, nous créons un fichier login.php pour afficher le code complet de la fonction de connexion

Plus tôt, nous avons créé le fichier style.css et placé ce fichier CSS dans le même dossier. Ensuite, appelez directement le style CSS.

Présentez le fichier public de la base de données 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>


Formation continue
||
<?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=" "> </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>
soumettreRéinitialiser le code
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