code: public static double fleschKincaidGradeLevel(String strText) {
          strText = cleanText(strText);
          return PHPMethods.round(((0.39 * averageWordsPerSentence(strText)) + (11.8 * averageSyllablesPerWord(strText)) - 15.59), 1);
      }
docs: Returns the Flesch-Kincaid Grade level of text entered rounded to one digit.
  
  @param   strText         Text to be checked
  @return