Manipulating URL

PenguinJr · #1 05-Apr-2004, 06:13

Hi guys,

Lets say i've passed a URL of www.wateva.com/test.php?user=$user from a php page that contained the variable $user with these codes.

Code:

$user = $_POST['username'];
header ("location: test.php?user=$user");

so when they're taken to the test page they should see http://www.example.com/test.php?user=Bob
for example.

Now...I wanna keep passing the variable of user and when I need it I want to be able to use that variable.

1st question: How do i pass the variable around in the URL from page to page?
2nd question: How do i use it later on, as in how do i assign it to a variable?

Thank you.

JdS · #2 05-Apr-2004, 07:10

Quote:

Originally Posted by PenguinJr

1st question: How do i pass the variable around in the URL from page to page?

PHP Code:


<?php

// initialise the $QS variable
$QS = '';

// appending the user's name, if any, to internal links...
if( isset($_GET['user']) )
   $QS = '?user=' . $_GET['user'];

// ....

// now when you create a link to an internal page...

echo "<a href=\"/page-2.php$QS\">Page 2</a>";
echo "<a href=\"/page-3.php$QS\">Page 3</a>";
?>

Quote:

2nd question: How do i use it later on, as in how do i assign it to a variable?

Thank you.

You retrieve the super global array $_GET['user'].

Be careful, always validate (clean) user supplied data... by using strip_tags() and urlencode() and other similar functions.

PenguinJr · #3 05-Apr-2004, 07:30

thanx, but how exactly do i encode the url?

PenguinJr · #4 05-Apr-2004, 07:35

Quote:

Originally Posted by PenguinJr

thanx, but how exactly do i encode the url?

and also, how do i use it as part of my html links? (the encoded version)

JdS · #5 05-Apr-2004, 08:16

You could try something like this...

PHP Code:


<?php

// initialise the $QS variable
$QS = '';

// appending the user's name, if any, to internal links...
if( isset($_GET['user']) )
{
  // screen the user input data
      // strip any html tags
      $_GET['user']  = strip_tags( $_GET['user'] );
      // remove spaces left over, if any...
      $_GET['user']  = trim( $_GET['user'] );
  // if we got this far and there's still something in $_GET['user'], then
  // it's safe to use...
  if( !empty($_GET['user']) )
  {
    $QS = '?user=' . urlencode( $_GET['user'] );
  }
}

// ....

// now when you create a link to an internal page...

echo "<a href=\"/page-2.php$QS\">Page 2</a>";
echo "<a href=\"/page-3.php$QS\">Page 3</a>";
?>

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