PHP switch statement with preg_match

Question

I have some problem to create a preg_match() inside my switch statement.

I want to write preg_match that match /oop/page/view/[some-number].

For now its working like:

If I run in my browser http://example.com/oop/page/view/1 its shows '404 page'. And when I run some address for example http://example.com/oop/page/view/test or even /oop/test its run 2nd case and dont know yet how. For sure something is wrong in my regex expresion..

public function check(){
    $url = filter_input(INPUT_GET, 'url');
    switch ($url) {
        case '':
            echo 'HomePage';
            break;
        case preg_match('#^/oop/page/view/\d+$#', $url):
            echo $url;
            break;
        default:
            echo '404 page';
            break;
    }

}

Answer 1

What you should do instead is something like this:

switch (true) {
  case preg_match(...):

I don't remember if switch in PHP is strict or loose comparison, but if it's strict, just put a !! in front of each case to convert it to boolean.

Answer 2

A switch statement compares each case expression to the original expression in the switch(). So

case preg_match('#^/oop/page/view/\d+$#', $url):

is analogous to:

if ($url == preg_match('#^/oop/page/view/\d+$#', $url))

This is clearly not what you want. If you want to test different kinds of expressions, don't use switch(), use if/elseif/else:

if ($url == '') {
    echo 'Homepage';
} elseif (preg_match('#^/oop/page/view/\d+$#', $url)) {
    echo $url;
} else {
    echo '404 page';
}