Php 如何使用我的代码进行区分大小写的登录？

为什么我的登录代码不区分大小写？我该怎么办

我的桌子“会员”

我尝试使用登录

1. username = mango and password = 123456 , it's echo "true"
2. username = MANGO and password = 123456 , it's echo "true"
3. username = Mango and password = 123456 , it's echo "true"

为什么我的登录代码不区分大小写？我该怎么办

<?PHP
    include("connect.php");
    $strUsername = trim($_POST["usename"]);
    $strPassword = trim($_POST["password"]);

    $sql = "SELECT * FROM member WHERE username = '".mysql_real_escape_string($strUsername)."' 
            and password = '".mysql_real_escape_string($strPassword)."' ";
    $result=mysql_query($sql);
    $row=mysql_fetch_array($result);
    $count=mysql_num_rows($result);
    if($count==1)
       {
           echo "true";
       }  
    else
       {
           echo "false";
       }        
?>

使用：

您还可以对代码进行一些其他改进

您没有对密码使用任何哈希-
您使用的是不推荐的
mysql.*
函数，PHP正试图逐步淘汰这些函数。有很多很好的选择，给出了一个很好的解释，可以帮助你选择最适合你的选择
稍微搜索一下就应该知道您正在使用（即无！）并且需要知道您用户的密码。成功的关键是
BINARY
？
<?PHP
    include("connect.php");
    $strUsername = trim($_POST["usename"]);
    $strPassword = trim($_POST["password"]);

    $sql = "SELECT * FROM member WHERE username = '".mysql_real_escape_string($strUsername)."' 
            and password = '".mysql_real_escape_string($strPassword)."' ";
    $result=mysql_query($sql);
    $row=mysql_fetch_array($result);
    $count=mysql_num_rows($result);
    if($count==1)
       {
           echo "true";
       }  
    else
       {
           echo "false";
       }        
?>

$sql = "SELECT * FROM `member` WHERE BINARY `username` = '".mysql_real_escape_string($strUsername)."' 
        AND BINARY `password` = '".mysql_real_escape_string($strPassword)."' ";