如何在PHP中调试“调用未定义的函数session_register（）”？

Question

我已经创建了使用php的基本登录。我已经修好了我以前的错误感谢您的帮助，但我现在在线路36上接收到新的错误：

电话/应用程序/ XAMPP/xamppfiles/htdocs中/游戏开发/ checklogin未定义功能了session_register（）。 php on line 36

我不知道为什么。有想法该怎么解决这个吗？

<?php 

      ob_start(); 
      $host="localhost"; // Host Name 

      $username="root"; // Mysql Username 

      $password=""; // Mysql Password 

      $db_name="DylansDB"; // Database Name 

      $tbl_name="members"; 

      // Connect to server and select databse. 
      mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
      mysql_select_db("$db_name")or die("cannot select DB"); 

      // Define $myusername and $mypassword 
      $myusername=$_POST['myusername']; 
      $mypassword=$_POST['mypassword']; 

      // To protect MySQL injection 
      $myusername = stripslashes($myusername); 
      $mypassword = stripslashes($mypassword); 
      $myusername = mysql_real_escape_string($myusername); 
      $mypassword = mysql_real_escape_string($mypassword); 
      $sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'"; 
      $result=mysql_query($sql); 

      // Mysql_num_row is counting table row 
      $count=mysql_num_rows($result); 

      // If result matched $myusername and $mypassword, table row must be 1 row 
      if($count==1){ 

      // Register $myusername, $mypassword and redirect to file "login_success.php" 
      session_register("myusername"); 
      session_register("mypassword"); 
      header("location:login_success.php"); 
      } 
      else { 
      echo "Wrong Username or Password"; 
      } 
      ob_end_flush(); 
    ?> 

Answer 1

$host="localhost"; // Host Name 

$username="root"; // Mysql Username 

$password=""; // Mysql Password 

$db_name="DylansDB"; // Database Name 

    $tbl_name="members"; // Table Name 

Answer 2

原来的MySQL扩展现在已经过时，并连接到数据库时，会产生E_DEPRECATED错误。而是使用MYSQLi或PDO_MySQL扩展。

使用mysqli的准备语句来避免SQL注入

1）检查您的MySQL用户权限

<?php 

     session_start(); 

     global $conn; 

     $servername = "localhost"; //host name 

     $username = "username"; //username 

     $password = "password"; //password 

     $mysql_database = "dbname"; //database name 

    //mysqli prepared statement 

     $conn = mysqli_connect($servername, $username, $password) or die("Connection failed: " . mysqli_connect_error()); 

     mysqli_select_db($conn,$mysql_database) or die("Opps some thing went wrong"); 



     // Define $myusername and $mypassword 
     $myusername=$_POST['myusername']; 
     $mypassword=$_POST['mypassword']; 

     // To protect MySQL injection 
     $myusername = stripslashes($myusername); 
     $mypassword = stripslashes($mypassword); 
     $myusername = mysql_real_escape_string($myusername); 
     $mypassword = mysql_real_escape_string($mypassword); 

     $tbl_name="members"; // Table name 


     $stmt = $conn->prepare("SELECT * FROM $tbl_name WHERE username=? and password=? "); 

      $stmt->bind_param('ss',$myusername,$mypassword); 

      $stmt->execute(); 
      $get_result =$stmt->get_result(); 

      $row_count= $get_result->num_rows; 

      if($row_count>0) 
      { 

       // If result matched $myusername and $mypassword, table row must be 1 row 
       $final_result =$get_result->fetch_assoc(); 

       $_SESSION['myusername']=$final_result['username']; 

       header("location:login_success.php"); 
       exit(); 

      } 
      else 
      { 
       echo "Wrong Username or Password"; 
      } 

      $stmt->close(); 
      $conn->close(); 


     ob_end_flush(); 
     ?> 

Answer 3

没有功能session_register()了;它已从PHP 5.3.0弃用，并从PHP 5.4.0完全删除，according to the official documentation.您应该使用超全局的$_SESSION[]。

您还有评论中提到的所有问题。