Convert dash to camelCase notation in PHP

function dashToCamelCase($string, $capitalizeFirstCharacter = false) {
   $str = str_replace(' ', '', ucwords(str_replace('-', ' ', $string)));
   if (!$capitalizeFirstCharacter) {
      $str[0] = strtolower($str[0]);
   }
   return $str;
}
echo dashToCamelCase('this-is-a-string');

function dashToCamelCase($string, $capitalizeFirstCharacter = false) {
   $str = str_replace('-', '', ucwords($string, '-'));
   if (!$capitalizeFirstCharacter) {
      $str = lcfirst($str);
   }
   return $str;
echo dashToCamelCase('this-is-a-test-string');