我编写了这段PHP代码来将Flesch-Kincaid可读性分数实现为一个函数:functionreadability($text){$total_sentences=1;//onefullstop=twosentences=>startwith1$punctuation_marks=array('.','?','!',':');foreach($punctuation_marksas$punctuation_mark){$total_sentences+=substr_count($text,$punctuation_mark);}$total_words=str_word_coun