Convert PHP MySQL Code to MySQLi

I use the code below for a login system on my site. A lot of programmers on other sites said this code is not safe in any way, but the login system I created is huge. I can't rebuild it all, that takes ages for a beginner programmer in PHP.

<?php $destroy = false; require('connect.php'); session_start(); if (isset($_POST['username']) and isset($_POST['password'])){ $username = $_POST['username']; $password = $_POST['password']; $query = "SELECT * FROM `user` WHERE username='$username' and password='$password'"; $result = mysql_query($query) or die(mysql_error()); $count = mysql_num_rows($result); if ($count == 1){ $_SESSION['username'] = $username; }else{ header("Location: index.php?login=invalid"); } } if (isset($_SESSION['username'])){ $username = $_SESSION['username']; include("inc/dashboard.inc.php"); } else { if(isset($msg) & !empty($msg)){ echo $msg; } if(isset($_GET["login"]) && $_GET["login"] === "invalid") { echo "<div class='redtxt'>That account doesn't exist.</div>"; } ?> <form action="" method="POST"> <p><label>Username:</label><br /><input id="username" type="text" name="username" /></p> <p><label>Password:</label><br /><input id="password" type="password" name="password" /></p> <input type="submit" name="submit" value="Sign in" /> </form> <?php } ?>

-------------Problems Reply------------

Suppose your database connection link is $conn (came through require('connect.php');) then you just need to change this:-

$result = mysqli_query($conn,$query) or die(mysqli_error($conn));
$count = $result->num_rows;

Note:- you can check php manual for mysqli_* because they are mostly similar to mysql_* syntax.

Some good points raised by others in comment. take care of that also. like password as plaintext etc.

You should convert your functions to mysqli (see previous answer) and besides that you really need to use prepared statements too make it a whole lot safer: http://mattbango.com/notebook/code/prepared-statements-in-php-and-mysqli/

--edit-- And as pointed out by others you should properly hash the password value (not md5 please)

Category:php Views:12 Time:2018-06-12
Tags: php mysql mysqli

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