我该如何修剪我的网址

Question

A have a delete link which goes to another page, call a function, if the function is successful, then I sent the user back to the page where they clicked delete.

I use this to go back:

if ($booking->deleteBooking($_GET['id']))
{
    header('Location: ' . $_SERVER['HTTP_REFERER']);
}

My link would look something like this:

/calendar.php?id=1&month=04&day=25&year=2014&t=11&v=true&f=true&reserved=true

Can I trim the link and remove &reserved=true when it's sent back?

Answer 1

Rather than performing string manipulations that could be prone to error, I suggest that you use PHP's URL functions to parse the HTTP_REFERER header and adjust it accordingly:

// parse the referrer
$referer = parse_url($_SERVER['HTTP_REFERER']);

// parse the querystring part
parse_str($referer['query'], $querystring);

// unset the reserved parameter (only if value is 'true'?)
if ($querystring['reserved'] === 'true') unset($querystring['reserved']);

// reconstruct the revised querystring
$referer['query'] = http_build_query($querystring);

// redirect to the adjusted URL
header('Location: ' . http_build_url($referer));