Question

我创建了一个登录检查脚本，用于检查用户名和密码是否与数据库中设置的帐户匹配。一切正常但它不是区分大小写它应该是！我该怎么做才能使这个脚本也检查大写/小写？例如：我有一个用户名帐户：AdMin密码：My43sGG。如果我在登录字段中输入admin和my43sgg，它也可以工作。

我的剧本：

<?php

// connect to the database
include("config.php");

// username and password sent from form 
$myusername=$_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);
$sql="SELECT * FROM " .$members. " 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:index.php");
}
else {
?>

Answer 1

使用BINARY

WHERE BINARY username = BINARY '$myusername' AND
      BINARY password = BINARY '$mypassword'

SQLFiddle Demo

作为旁注，如果变量的值（ s ）来自外部，则查询易受SQL Injection攻击。请查看下面的文章，了解如何防止它。通过使用PreparedStatements，您可以摆脱在值周围使用单引号。

How to prevent SQL injection in PHP?

Answer 2

与问题无关，但如果你将自己的密码加密为共享密码并在数据库中查找AES加密字符串，那会更好....我想这也可以解决问题虽然如果用不同的案例加密它们会有所不同

Answer 3

您可以编写自定义函数来像这样验证它

function isPartUppercase($string) {
if(preg_match("/[A-Z]/", $string)===0) {
    return true;
}
return false;
}

Answer 4

试试这个

<?php 
session_start(); 
$errorMessage = ''; 
if (isset($_POST['txtUserId']) && isset($_POST['txtPassword'])) { 

    $userId   = $_POST['txtUserId']; 
    $password = ($_POST['txtPassword']); 
     require_once("db_fns.php");
    db_connect();
    $sql = "SELECT *  
            FROM adminuser
            WHERE username = '$userId' AND password = '$password'"; 

    $result = mysql_query($sql) or die('Query failed. ' . mysql_error());  

    $row=mysql_fetch_array($result);
    $admin=$row['username'];
   // print $admin;
    if (mysql_num_rows($result) == 1) { 

        $_SESSION['db_is_logged_in'] = true; 

        $_SESSION['admin']=$admin;

        header('Location: main.php'); 
        exit; 
    } else { 
        $errorMessage = 'Sorry, wrong user id / password'; 
    } 

} 
?>

如何检查用户名和密码区分大小写？

4 个答案: