/** * Determines if a string starts with a specified substring, searching case-sensitively. * * As a special case, the method returns `true` if the searched substring is empty. * * @param string $withString The searched substring. * * @return bool `true` if the string starts with the substring specified, taking into account the letter case of * the characters, and `false` otherwise. */ public function startsWith($withString) { return CUString::startsWith($this, $withString); }