removing question marks alone

Question

I want to remove with PHP question marks in excess or that do not belong to a question, like from this:

question? ???? ???
question???

to this: (keeping only one question mark )

question?
question?

this is my code:

$text = 'question? ???? ???
question???';
echo preg_replace("?", "", $text);

Answer 1

preg_replace('/\\?[? ]+/', '?', $text);

这将用单个问号替换问号后跟问号和空格的任意组合。