布尔值 SQL 和 PHP 验证

Booleans SQL and PHP validation

我在 table(用户)中有一列名为 admin,其数据类型为布尔值。两个用户设置为"true"

我的 objective 是当这两个登录时,他们可以访问后台,但到目前为止代码无法正常工作:

   <?php

    session_start();

    $error="";
    $successMessage="";



    if ($_POST){
    if(!isset($_POST["salada"]) || $_POST["salada"]===""){
    $error = "PHP: An email is required <br>";
    }



    if(!isset($_POST["arroz"]) || $_POST["arroz"]===""){
    $error .= "PHP: A password is required";
    }

    if ($error !=""){
    $error = '<div class="error-login">'.$error.'</div>';


    }else {

    require("MGconfig.php");


    $email = mysqli_real_escape_string($connection, $_POST["salada"]);
    $pwd = md5(mysqli_real_escape_string($connection, $_POST["arroz"]));


    $result = mysqli_query($connection, "select name, id from users where     email = '".$email."' and password = '".$pwd."'");


    if (mysqli_num_rows($result) !==1){
        $error='<div class="error-login">PHP: Invalid email or   password</div>';
        header("Location:index.php?error=".$error);

    }else {

            $nome = mysqli_fetch_row($result);

            $_SESSION["name"] = $nome[0];
            $_SESSION["id"]=$nome[1];



            header ("Location: main.php");
        }
      }


    }

   ?>

 <?php

  if($_SESSION['admin'] !=0){

        header ("Location:admin.php");       
    }?>

有人能告诉我为什么不起作用吗?是语法吗?如果我比较字段 "name",则限制有效...提前致谢!

问题是,您还没有 selected SELECT 查询中的 admin 列,您只有 selected idname 列。另外,您无法在任何地方检查登录用户是否为管理员。

所以解决方案是,select SELECT 查询中的 admin 列,并使用该列值来检查登录用户是否为管理员,例如这个:

// your code

$result = mysqli_query($connection, "select name, id, admin from users where email = '".$email."' and password = '".$pwd."'");

if (mysqli_num_rows($result) !== 1){
    $error='<div class="error-login">PHP: Invalid email or   password</div>';
    header("Location:index.php?error=".$error);
}else{
    $nome = mysqli_fetch_row($result);
    $_SESSION["name"] = $nome[0];
    $_SESSION["id"] = $nome[1];
    if($nome[2]){
        // logged in user is admin
        $_SESSION["admin"] = true;
    }else{
        // logged in user is not admin
        $_SESSION["admin"] = false;
    }
    header ("Location: main.php");
    exit();
}

// your code

旁注:了解prepared statements because right now your query is susceptible to SQL injection. Also see how you can prevent SQL injection in PHP