我有稍微翻了一下網上的資料好像是因為參考資料太舊php版本不符合
那我有甚麼辦法在不改動太多東西的情況下讓我的php正常嗎?
這是一個參考別人的登入php

<?php
    $username=$_POST['user'];
    $password=$_POST['pass'];

    $username=stripcslashes($username);
    $password=stripcslashes($password);
    $username=mysql_real_escape_string($username);
    $password=mysql_real_escape_string($password);

    mysql_connect("localhost","root","");
    mysql_select_db("login");

    $result=mysql_query("select * from users where username = '$username' and password = '$password'")
                or die("Failed to query datebase ".mysql_error());
    $row=mysql_fetch_array($result);
    if($row['username'] == $username && $row['password'] == $password ){
        echo "Login sucess. Welcome ".$row['username'];
    }else{
        echo "Failed to login!";
    }
    ?>