Camel Case a string

if ( ! function_exists('camelCase'))
{
  function camelCase($subject, $delimiters=' _-', $lcfirst=true)
  {
    if ( ! is_string($subject))
    {
      throw new Exception("Subject must be of type string");
    }
    $subject = preg_replace('/[\s]+/', ' ', $subject);
 
    $subject = preg_split("/[$delimiters]/", $subject, -1, PREG_SPLIT_NO_EMPTY);
 
    foreach ($subject as $key => &$word)
    {
      $word = preg_replace('/[[:punct:]]/', '', $word);
 
      if (preg_match('/[A-Z]+$/', $word)) $word = ucfirst($word);
 
      else $word = ucfirst( strtolower($word) );
    }
    $subject = implode('', $subject);
 
    if ($lcfirst)
    {
      return function_exists('lcfirst') ? lcfirst($subject)
      :
      strtolower($subject[0]).substr($subject,1);
    }
    return $subject;
  }
}
 
// "usingPHPTurnThisIntoCamelCASENow"
echo camelCase("Using PHP turn This into   camelCASE, now!");