Question

In a link you can append get parameters. If I want to add a new get parameter to a url which already has one.

Example:
old: example.php?hi=hello
new: example.php?hi=hello&hello=hi

Is there any other way of doing it this way:

echo '<a href="'. $_SERVER['REQUEST_URI'].'&hello=hi">';

Answer 1

The caveat is detecting whether or not the question mark exists or not. If it doesn’t, you’ll need to add it. A quick and dirty way would be strpos:

if (strpos($_SERVER['REQUEST_URI'], '?') === false) {
    $qsPart = '?';
} else {
    $qsPart = '&';
}

$oldURL = $_SERVER['REQUEST_URI'];
echo '<a href="' . $oldURL . $qsPart . 'hello=hi">';

A more robust method would be breaking down the REQUEST_URI and rebuilding it after inspection using parse_url and http_build_query but that may be beyond the scope.