一个简洁的方式与你的两个数据结构做将是：

A concise way to do it with your two data structures would be:

count( array_intersect( str_split($my_string), $special_chars ) )

这也将告诉你有多少特殊字符的字符串中

That would also tell you how many of the special characters are in the string.

您本来写一个循环为你的角色列表和 strpos 手动探测。

You could otherwise write a loop for your character list and manually probe with strpos.

最少的努力将是你的特殊字符列表转换为正则表达式charclass将和测试对字符串。

The least effort would be converting your special character list into a regex charclass and testing against the string.