code: protected String[] ph(String... strs) {
          String[] res = new String[strs.length];
          for(int i = 0; i < res.length; i++){
              res[i] = ph(strs[i]);
          }
          return res;
      }
docs: replace any placeholder from the given strings
  @param strs strings to replace the placeholders from
  @return same string with the placeholders merged
  @see org.codegist.crest.CRest#placeholder(String, String)