Php 获取数据时出错

我的朋友们，我有以下错误：

分析错误：语法错误，中出现意外的“是”（T_字符串）

我不明白为什么，对我来说这是对的

<?php $all_users = get_data('SELECT active FROM members WHERE active = 'Yes';'); $get_users = count($all_users); echo $get_users ;?>

或

或

---

@达贡，你是说，这是引语？

get_data('SELECT active FROM members WHERE active = "yes" ');

get_data('SELECT active FROM members WHERE active = \'Yes\' ');

get_data("SELECT active FROM members WHERE active = 'Yes' ");