Why I get solution this "notice: undefined index: user in C:\wamp\www\S_WEB\login.php on line 6"

Question

1.00/5 (1 vote)

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PHP

<?php 
    require_once'connection/dbcon.php'; 
    	if (isset($_POST['login']))
    		{
    			$username = mysqli_real_escape_string($db, $_POST['user']);
    			$password = mysqli_real_escape_string($db, $_POST['pass']);
                
                $query 		= mysqli_query($db, "SELECT * FROM users WHERE  password='".$password."' and username='".$username."'");
    			$row		= mysqli_fetch_assoc($query);
    			$num_row 	= mysqli_num_rows($query);
                // var_dump($row);
                // var_dump($num_row);
                // exit;
    			if ($num_row > 0) 
    				{			
    					$_SESSION['user_id']=$row['sn'];
    					header('location:home.php');
     
    				}
    			else
    				{
    					echo 'Invalid Username and Password Combination';
    				}
    		}
>

What I have tried:

i just tried to solve this problem but still dont get the solution.

Posted 26-Apr-17 20:11pm

Member 13155332

Updated 26-Apr-17 20:37pm

David_Wimbley

v3

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Comments

Richard Deeming 27-Apr-17 11:04am

Never store passwords in plain text!

Secure Password Authentication Explained Simply[^]
Salted Password Hashing - Doing it Right[^]

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David_Wimbley · Answer 1 · 2017-04-26T20:25:00

It looks like your issue is here probably

PHP

$username = mysqli_real_escape_string($db, $_POST['user']);

Your error message doesn't match up with the code you posted but it is pretty clear. Your POST to login.php does not contain a "user" field. Check what you are posting to make sure "user" is one of the form vars being passed to login.php.

You can use a tool like fiddler, chrome dev tools, or firebug/firefox dev tools to see what is being posted.

Patrice T · Answer 2 · 2017-04-26T20:37:00

Never build an SQL query by concatenating with user inputs, it is named "SQL injection", it is dangerous for your database and error prone.
A single quote in a name and your program crash. If a user input like "Brian O'Conner" can crash your app, it is an SQL injection vulnerability.
SQL injection - Wikipedia[^]
SQL Injection[^]

Why I get solution this "notice: undefined index: user in C:\wamp\www\S_WEB\login.php on line 6"

2 solutions

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