quick newb php question

[Drezek]

when using query string like http://127.0.0.1/profile.php?id=6436 how do i make it so if the id doesnt exist it displays a message saying the profile doesnt exist instead of displaying the page without any values

thanks, Drezek

[Daniel0]

if (!isset($_GET['id'])) {
echo 'hi';
}

[Drezek]

thank you that was very simple im learning php right now so im just messing around with it

[Drezek]

what if i only have up to 7 ids and someone will try to load a page with the id of 8

[Daniel0]

Well, that depends. If you're getting it from a database you could do something like this:

 

$id = isset($_GET['id']) ? (int) $_GET['id'] : 0;
// or you could do:
$id = (int) filter_input(INPUT_GET, 'id', FILTER_UNSAFE_RAW)

$result = mysql_query('SELECT * FROM users WHERE id = ' . $id . ' LIMIT 1');

if (mysql_num_rows($result)) {
$user = mysql_fetch_assoc($result);
// do stuff
}
else {
echo 'User does not exist.';
}

[Drezek]

not sure how that works but if i study it for a bit il bet il get it THANKS A BUNCH

[Daniel0]

Well, as always, there are many ways to do one thing, and which way you would want to use depends on the context.