Redirecting URL with elseif $_SERVER['PHP_SELF']

Question

I have a main page that users go to that shows output from a MySQL query depending on the variable passed to it. So;

http://website/mypage.php?page=0

However, I would like to set up redirection so that if someone just goes to

http://website/mypage.php

that it will go to http://website/mypage.php?page=0. I thought of using the following code, which verifies the current page as well as verifies that a user's session is established;

elseif ($_SERVER['PHP_SELF'] == '/mypage.php' && isset($_SESSION['valid_user']))
{
header('Refresh: 0; URL=/mypage.php?page=0');
}

But, this looks to be too general. Is there a way to check for exactly '/mypage.php' or maybe '/mypage.php?page=' ? I thought of using strlen to check for only the 11 characters in /mypage.php, but I'm not sure that this is the most efficient way of doing it.

Answer 1

In your mypage.php you can check something like this

if(!isset($_GET['page'])) {
    header('location: /mypage.php?page=0');
    exit;
}

But, I think, instead of redirecting to same page with a get variable, why don't just show the page you want to show by default, when there is no page variable is set.

Answer 2

You can check to see if the variable page has a value and if its empty you can do the redirect

if($_GET['page'] == ''){
  header('Location: /mypage.php?page=0');
  exit;
}

or

if(!isset($_GET['page'])){
  header('Location: /mypage.php?page=0');
  exit;
}

Answer 3

You should use this way:

header('Location: /mypage.php?page=0');
exit;

Otherwise check the $_SERVER variables for more strict match. http://php.net/manual/en/reserved.variables.server.php

I think probably you need $_SERVER['REQUEST_URI']

Answer 4

Is this what you're looking for?

if(!isset($_GET['page']) || empty($_GET['page'])) {
    Header('Location: http://website/mypage.php?page=0')
    exit();
}

or

if(!isset($_GET['page']))
    $_GET['page'] = 0;

I'm not sure about the second solution, you shouldn't attribute value to $_GET[] variables.

Answer 5

if( !isset($_REQUEST['page']) ) {
    header('Location: /mypage.php?page=0');
    exit(0);
} else {
    if( $_REQUEST['page']=="" ) {
        header('Location: /mypage.php?page=0');
        exit(0);
    }
}