Creating URL from Title error in Php Local Environment

Hi, I am having trouble while creating URL's from the title, below is the code which is working in online editor but not working in my local dev environment.

Jetpack Security

Sucuri Security

public static function uri($url) {
    # Prep string with some basic normalization
    $url = strtolower($url);
    $url = strip_tags($url);
    $url = stripslashes($url);
    $url = html_entity_decode($url);
    # Remove quotes (can't, etc.)
    $url = str_replace('\'', '', $url);
    # Replace non-alpha numeric with hyphens
    $match = '/[^a-z0-9]+/';
    $replace = '-';
    $url = preg_replace($match, $replace, $url);
    $url = trim($url, '-');
    return $url;
 }

Please advice how to fix it!