Why is my condition being processed incorrectly?

Question

PHP

My script should receive a link without a host, and then the condition is fulfilled, but for some reason the condition is not displayed correctly for me and the first condition always comes out.
Here is my script

public function getPage()
    {
        $uri = $_SERVER['REQUEST_URI'];// Приходит /online/?utm-sources=google_adwords
        if ($uri === '/'){
            $page = ''; // $page = null
        } else {
            $page = preg_replace('/', '', $_SERVER['REQUEST_URI']);
        }
        return $page; //$page = null
    }

Answer 1

=== means equal in value and type
== means equal in value
Otherwise, you are comparing a string with a string, and therefore, even if the strings are not equal, the condition is still met