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PHP login to determine whether the account password is correct

尚Original: 2019-10-21 13:10:306334browse

Connect PHP to the database and determine whether the account password is correct by verifying whether the account password is the same as the record in the database.

php code to verify whether the login name and password are correct:

<?php
 $servername = "服务器名";
 $username = "账户名";
 $password = "密码";
 $dbname = "数据库名";
?>
<?php
 // Session需要先启动。
 session_start();
 //判断uname和pwd是否赋值
 if(isset($_POST[&#39;uname&#39;]) && isset($_POST[&#39;pwd&#39;])){
 $name = $_POST[&#39;uname&#39;];
 $pwd = $_POST[&#39;pwd&#39;];
 //连接数据库
 $conn = new mysqli($servername, $username, $password, $dbname);
 if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
 }
 //验证内容是否与数据库的记录吻合。
 $sql = "SELECT * FROM test_students_all WHERE (student_name=&#39;$name&#39;) AND (password=&#39;$pwd&#39;)";
 //执行上面的sql语句并将结果集赋给result。
 $result = $conn->query($sql);
 //判断结果集的记录数是否大于0
 if ($result->num_rows > 0) {
  $_SESSION[&#39;user_account&#39;] = $name;
  // 输出每行数据
  while($row = $result->fetch_assoc()) {
  echo &#39;<p>&#39; . $row[&#39;student_nbr&#39;] . &#39;<br/>&#39; . $row[&#39;student_name&#39;] . &#39;(&#39; . $row[&#39;sex&#39;] . &#39;)&#39; . &#39;<br/>&#39; . $row[&#39;class&#39;] . &#39;<br/>&#39; . $row[&#39;major&#39;].&#39;</p>&#39;;
  // <p><img src="student_images/CLASS/STUDENT_NBR.jpg" /></p>
  echo &#39;<p><img src="student_images/&#39; . $row[&#39;class&#39;] . &#39;/&#39; . $row[&#39;student_nbr&#39;] . &#39;.jpg" /></p>&#39;;
  }
 } else {
  echo "没有您要的信息";
 }
 $conn->close(); 
 }
?>
<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>登录校验</title>
</head>
<body>
 <p>
 <?php
  // isset(xx) 测试xx是否设置了
  if(isset($_SESSION[&#39;user_account&#39;])){
  echo &#39;你好，&#39; . $_SESSION[&#39;user_account&#39;];
  }
  else{
  echo &#39;游客&#39;;
  }
  //$conn->close();
 ?>
 </p>
 <form method="POST">
 <input type="text" name="uname" placeholder="用户名" />
 <br />
 <input type="password" name="pwd" placeholder="密码" />
 <br />
 <input type="submit">
 </form>
</body>
</html>

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