public function isEngine(): bool
    {
        if (($is = &$this->cacheKey(__FUNCTION__)) !== null) {
            return $is; // Cached this already.
        }
        $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
        return $is  = $user_agent && preg_match('/(?:blink|gecko|konqueror|msie|opera|playstation|presto|trident|webkit)/ui', $user_agent);
    }
public function isEngine(): bool
    {
        if (($is = &$this->cacheKey(__FUNCTION__)) !== null) {
            return $is; // Cached this already.
        }
        $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
        return $is  = $user_agent && preg_match('/(?:blink|gecko|konqueror|msie|opera|playstation|presto|trident|webkit)/ui', $user_agent);
    }
public function isEngine ( ) : bool { if ( ( $ is = & $ this -> cacheKey ( __FUNCTION__ ) ) !== null ) { return $ is ; // Cached this already. } $ user_agent = $ _SERVER [ 'HTTP_USER_AGENT' ] ?? '' ; return $ is = $ user_agent && preg_match ( '/(?:blink|gecko|konqueror|msie|opera|playstation|presto|trident|webkit)/ui' , $ user_agent ) ; }
Is a browser engine.

@since 170413.34876 User-Agent utils.

@return bool True if is engine.

@see https://jas.xyz/2p3VIbG
Is a browser engine .