POST variable to another page while redirecting - php

Question

I am redirecting the user back to login page if the login inputs arenot correct.

$sql = "select * from Driver where username=$username and pwd=$pwd";
$driver = mysql_query($sql);

if(!$driver){
  header("Location: http://domain.de/login.php");
  exit();
}

can i also pass message like "sorry, username isnot correct" to login page?

i dont want to use session. get isnot the option here

php.net/manual/en/function.urlencode.php should help you. When you append it to the URL. Make sure you use urldecode() on the other side. — Kevin
– Kevin, Commented May 17, 2013 at 16:49
@Kevin, thanks. working now. but can i also POST the variable? — doniyor
– doniyor, Commented May 17, 2013 at 16:56
You can, but it gets messy. See this question for a detailed explanation: stackoverflow.com/questions/5576619/php-redirect-with-post-data — Kevin
– Kevin, Commented May 17, 2013 at 16:59

Nathan van der Werf · Accepted Answer · 2013-05-17 16:48:50Z

1

you could do it like

header("Location: http://domain.de/login.php?error=username");

and do on the other page

if ($_GET['error'] == 'username') {
    echo 'Sorry, username is not correct!';
}

EDIT: Watch out for SQL injection also

answered May 17, 2013 at 16:48

Nathan van der Werf

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2 Comments

doniyor Over a year ago

simple: i have big message and i dont want to put it to url

Nathan van der Werf Over a year ago

That's why you just use ?error=username and in the other page you use if else statements to show the big message ;)

Eugene · Accepted Answer · 2013-05-17 16:51:46Z

1

You may add get paramet to location header or save message flag in session. Like this:

 $sql = "select * from Driver where username=$username and pwd=$pwd";
 $driver = mysql_query($sql);

 if(!$driver){
     header("Location: http://domain.de/login.php?wasredirect=1");
     exit();
 }

 //////// In login.php

 if (isset($_GET['wasredirect'])) {
     echo "sorry, username isnot correct";
 }

Or this:

     $sql = "select * from Driver where username=$username and pwd=$pwd";
 $driver = mysql_query($sql);

 if(!$driver){
     header("Location: http://domain.de/login.php");
     if (!isset($_SESSION)) {
         session_start();
     }
     $_SESSION['redirect'] = true;
     exit();
 }

 //////// In login.php

 if (!isset($_SESSION)) {
     session_start();
 }
 $_SESSION['redirect'] = true;
 if (isset($_SESSION['redirect']) &&$_SESSION['redirect'] ) {
     echo "sorry, username isnot correct";
     unset($_SESSION['redirect']);
 }

answered May 17, 2013 at 16:51

Eugene

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2 Comments

doniyor Over a year ago

i dont want to save into session. this is just a 2 second message and it doesnot have to be saved into session

Eugene Over a year ago

You may delete value from session after "use", like in example, or add get paramter

gotardo · Accepted Answer · 2013-05-17 17:00:56Z

1

I think the best solution is to load that login.php page as a part (the view) of the current script (the controller) and set a variable with the value of the message. Something like:

if(!$driver){
$message = "Sorry, username isnot correct";
} 
else {
$message = "Whatever";
}
include('login.php');

$message will be available for you inside login.php script.

answered May 17, 2013 at 17:00

gotardo

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Comments

marc_s · Accepted Answer · 2015-08-04 19:21:10Z

1

For simply giving away a message, you can add it to the URL.

header("Location: http://domain.de/login.php?e=1234");

I recommend using error codes instead of full-length messages for better flexibility.

Note, how ever, that doing it right would require to implement a MVC pattern and then internally load the routing of the error page. But that might be too much for a small script.

I know you don´t ant feedback to your query. No need to worry, unless you are clueless about what SQL injection means.

Best regard

Zsolt

edited Aug 4, 2015 at 19:21

marc_s

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answered May 17, 2013 at 16:53

Zsolt Szilagyi

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Comments

SAVAFA · Accepted Answer · 2013-05-17 16:53:38Z

-3

Change the query to:

$sql = "select * from `Driver` where `username`='$username' and `pwd`='$pwd'";

Note the backticks and single quotes

answered May 17, 2013 at 16:53

SAVAFA

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3 Comments

doniyor Over a year ago

this is not the quuestion, my query is fine

SAVAFA Over a year ago

Strings in sql query which are not in quotations can make problem

SAVAFA Over a year ago

in case the variable get a value as reserved mysql words, like select or order

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