UpperCamel.php

class UpperCamel {

  public function __invoke(string $value): string {
    $value = preg_replace('/[\s\-_]/s', ' ', $value);
    $value = trim(preg_replace('/[A-Z]/', ' \0', $value));
    $value = preg_replace('/(\s)\s+/s', '\1', $value);
    $value = ucwords($value);
    $value = preg_replace('/\s+/s', '', $value);

    return $value;
  }
}