[SOLVED] Redirection?

Derleek · May 15, 2008

what is the syntax to redirect a user to a specific page?

i have a script set up for user verification and i want it to redirect to a specific page when the user name and password are correct... can't seem to find the syntax for it in the php manual

May 15, 2008

You could use javascript and PHP.

<?php

echo <<<END
<script language='javascript' type='text/javascript'>
location.href = 'file.php';
</script>
END;
?>

soycharliente · May 15, 2008

<?php
header("Location: page.php");
exit;
?>

Some users disable JS, so using all PHP might be best.

Make sure that you have not output any data before using this or it won't work.

DeanWhitehouse · May 15, 2008

header();

or

meta refresh

if you get a header error, try adding

ob_start();

to the beggining of the script

May 15, 2008

OMG. Total lapse of concentration there. I was in JavaScript mode there...

Derleek · May 15, 2008

I'm validating the info on the login.php page so i don't know if header() will work...

does this require that i don't output any HTML data, or just don't use any PHP outputs?

how does meta refresh work?

May 15, 2008

You cannot have any output whatsoever before a header();

Derleek · May 15, 2008

ok, then how would i go about sending a user to, lets say, randomPage.php after i have validated their info on login.php...

May 15, 2008

As long as you do not have output, just:

<?php
// Currently in login.php
// Make sure they are a user with valid info
// Redirect the user
header("Location: randomPage.php");
?>

DeanWhitehouse · May 15, 2008

when you have check that the user is the user,

put

header("Location:randompage.php");

remeber put ob_start();

at the beggining of the page, after session_start();

soycharliente · May 15, 2008

With good coding and proper structure, there's really no need to ever use ob_start() IMO. If you think about it, you shouldn't ever have any output before the possibility of redirecting the page.

Derleek · May 15, 2008

sorry, let me be more clear.

here is my code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>Login</title>
</head>
<body>

<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
screen name: <input type="text" name="login" maxlength="25"><br>
password: <input type="password" name="pword" maxlength="25"><br>
<input type="submit" name="submitbtn" value = "Login!">
</form>
or Signup <a href="SignUp.php">here</a> <br>
<?php
//validation code would be here...
     if(username && password are correct)
           {
                //would be code to send user to game.php
           }
}
?>
</body>
</html>

i'd prefer to do the validation with a script on login.php, as i understand it is more efficient. So maybe i am in need of a way to do this with out generating any output...

maybe the term i am looking for is not 'redirect'. I simply need to send the user to a new page after the password and user name are varified

May 15, 2008

I would just create another script that handles the login. Other than that, you would have to rebuild your script so you can send headers. To me, it just makes more sense to have a separate script.

Derleek · May 15, 2008

it just seems like it would be more efficient to validate the form before even $_POSTing it... that way if a user doesn't have the correct information there isn't even any need for a redirect?

Derleek · May 15, 2008

well how would i rebuild it to send headers?

DeanWhitehouse · May 15, 2008

you would need to use,

if(isset($_POST[']))

{

}

statements

and then have the valdiation code in there

soycharliente · May 15, 2008

Just move the validation to the top of the page.

<?php
//validation code would be here...
     if(username && password are correct)
           {
                //would be code to send user to game.php
           }
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>Login</title>
</head>
<body>

<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
screen name: <input type="text" name="login" maxlength="25"><br>
password: <input type="password" name="pword" maxlength="25"><br>
<input type="submit" name="submitbtn" value = "Login!">
</form>
or Signup <a href="SignUp.php">here</a>
</body>
</html>

DeanWhitehouse · May 15, 2008

that be checking everytime you go to the page, mine would just check when they click submit

soycharliente · May 15, 2008

@blade: I assumed the validation included some kind of check to see if the form was submitted.

@op: Here's some basic code I always start with when I build a login page. Maybe you can get some use out of it too.

<?php
session_start();

function myEscape($string)
{
dbconnect();
$new = get_magic_quotes_gpc() ? stripslashes($string) : $string;
$safe = mysql_real_escape_string($new);
dbclose();
return $safe;
}

if ($_POST["Submit"] == "Login")
{
foreach ($_POST as $key => $val)
{
	$_POST[$key] = myEscape($val);
}
$un = $_POST['Username'];
$pw = md5($_POST['Password']);
dbconnect();
$sql = "SELECT * FROM table WHERE username='{$un}' AND password='{$pw}'";
$result = mysql_query($sql) OR DIE ("Unable to validate login.");
dbclose();
if (mysql_num_rows($result) > 0)
{
	$r = mysql_fetch_assoc($result);
	$user = $r["username"];
	$pass = $r["password"];
	if ($un == $user && $pw == $pass)
	{
		$_SESSION['Login'] = TRUE;
		header("Location: data.php");
		exit;
	}
	else
	{
		$_SESSION['Login'] = FALSE;
		$error = TRUE;
	}
}
else
{
	$_SESSION['Login'] = FALSE;
	$error = TRUE;
}
}

?>
<html>
<body>

<form action="login.php" method="post">
<p>
	<label for="Username" id="Username">Username:</label><br />
	<input type="text" name="Username" value="" maxlength="20" />
</p>
<p>
	<label for="Password" id="Password">Password:</label><br />
	<input type="password" name="Password" value="" maxlength="20" />
</p>
<p>
	<label for="Buttons" id="Buttons">Done?</label><br />
	<input type="submit" name="Submit" value="Login" /> - 
	<input type="reset" name="Reset" value="Reset" />
</p>
</form>

<?php
echo ($error) ? "<p class=\"error\">Login error.</p>" : "";
?>

</body>
</html>

Derleek · May 16, 2008

ok, i tried moving my script above the <html> tags and removing all of the output... but i still get the output error which is

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\motogame\Login.php:2) in C:\xampp\htdocs\motogame\Login.php on line 54

here is my entire login.php file:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<?php
function sanityCheck($string, $type, $length){

  // assign the type
  $type = 'is_'.$type;

  if(!$type($string))
    {
    return FALSE;
    }
  // to check if there is anything in the string
  elseif(empty($string))
    {
    return FALSE;
    }
  // to check how long the string is
  elseif(strlen($string) > $length)
    {
    return FALSE;
    }
  else
    {
    // if all is well, we return TRUE
    return TRUE;
    }
}

function checkSet(){
  return isset($_POST['login'], $_POST['pword']);
  }
if(checkSet() !=FALSE)
{
if(empty($_POST['login'])==FALSE && sanityCheck($_POST['login'], 'string', 25)!=FALSE && empty($_POST['pword'])==FALSE && sanityCheck($_POST['pword'], 'string', 25)!=FALSE)
{
	$link = @mysql_connect('localhost', 'root', 'zOinks12');
	if (!$link) 
    {
		die('Not connected : ' . mysql_error());
    }	
	$db_selected = mysql_select_db('moto', $link);
	if (!$db_selected)
	    {
	    die ("Database not selected : " . mysql_error());
	    }
	$query = "SELECT realName, screenName, password, uID FROM fans";
	$result = mysql_query($query);
	while($row = mysql_fetch_array($result, MYSQL_ASSOC))
			{
				if($row[screenName]==$_POST['login'])
				{
					if($row[password]==$_POST['pword'])
					{
					header ("Location: moto_game.php");
					exit();
					}
					else 
					{
						exit();
					}
				}
			}
}
else
{
	exit();
}


}
?>

<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>Login</title>
</head>
<body>

<form action="Login.php" method="post">
screen name: <input type="text" name="login" maxlength="25"><br>
password: <input type="password" name="pword" maxlength="25"><br>
<input type="submit" name="submitbtn" value = "Login!">
</form>
or Signup <a href="SignUp.php">here</a> <br>
</body>
</html>

soycharliente · May 16, 2008

Make sure that you have not output any data before using this or it won't work.

You can't output any HTML before the header() call. Move he DOCTYPE after all the PHP code.

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[SOLVED] Redirection?

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