Redirecting error message in php

Question

I have a login.php (input form) and loginvalidation.php(server side validations). I want to display an error message on login.php when input is invalid. I am not able to redirect user to login.php and display error message on it. On Login.php the error message field is <label id="lblErrorMessage" style="color: red;"><?=$errorString?></label>.

Do you have any code that you've tried so far? In general, you may want to consider using a $_SESSION variable for the error message, here... if you are setting the error message and then redirecting to a new page. (See: php.net/manual/en/reserved.variables.session.php) — summea
– summea, Commented Mar 3, 2012 at 23:23

Teson · Accepted Answer · 2012-03-03 23:47:15Z

3

I presume you have a form in login.php with

 <form method="post" action="loginvalidation.php">

In loginvalidation.php add

 if ($badLogin) header('location:login.php?err=badLogin');

And catch the err in login.php

$err = $_GET['err'];

I'd recommend to put the validation and form in the same php-page.

<?php
if($_SERVER['REQUEST_METHOD'] == 'POST') {
  //validate and if ok maby redirect (application dependent)
  //if no redirect - we still need to login
  $err = 'no good';
 ?>
 <html>the login form...

regards, /t

answered Mar 3, 2012 at 23:47

Teson

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3 Comments

user1247412 Over a year ago

What do you mean by to put the validation and form in the same php-page? You mean to say I should include checking for valid login details in login.php itself?

user1247412 Over a year ago

can you please elaborate it a bit?

Teson Over a year ago

Yes, exactly. It's more conveniant to keep track of the code that way. There are circumstances when the opposite is more suiting, but make use of the fact that php can live without separate models/objects.

cjtech · Accepted Answer · 2012-03-03 23:36:44Z

0

What I do for login forms -

I set the action to (in your case) login.php,
do error checking
a. display the errors if there are any - or -
b. If there aren't any errors I then redirect to the main page.

answered Mar 3, 2012 at 23:36

cjtech

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2 Comments

user1247412 Over a year ago

In my case how will i display error message on login.php (say invalid username/password) after validations are done on loginvalidation.php

cjtech Over a year ago

See user247245's answer below

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