Today, the use of QUERY STRING is very common on dynamic WebSites. May not look like it, but it's a very simple thing to do.

Sample 1:

The sample 1 is the most used. see:

<?php ini_set("register_globals", "on"); if($page == "") {     // Main Page     echo "main page!!"; } elseif($page == "about") {     // About page     echo "about page!!"; } elseif($page == "contact") {     // Contact page     echo "contact page!!"; } else {     // Page not found     echo "Oops.. Page not found (404)"; } ?>

name it test1.php and try the following URL"s:

test1.php
test1.php?page=about
test1.php?page=contact
test1.php?page=1234

very simple, right? We"ve defined the variable $page by the URL. This is just an example,
you can always change the actions (in this case, echo()).


Sample 2:
this sample may be better, just because we use a predefined variable, called

$QUERY_STRING (everything after page.php?).

<?php
ini_set("register_globals", "on");

if($QUERY_STRING == "") {
    // Main Page
    echo "main page!!";
} elseif($QUERY_STRING == "about") {
    // About page
    echo "about page!!";
} elseif($QUERY_STRING == "contact") {
    // Contact page
    echo "contact page!!";
} else {
    // Page not found
    echo "Oops.. Page not found (404)";
}
?>
name it test2.php and try the following URL"S:

test2.php
test2.php?about
test2.php?contact
test2.php?1234

almost the same thing, but you don't have to define the variable page!

You can use whatever sample you want. Just enjoy it!