extension intl not installed although showing it checked on the extensions

I solved my problem but I am wondering why? its like when we solve our problems but we don't know how on earth it has been solved I have wamp server on windows I was not seeing intl installed in phpinfo page, but in php.ini it exists and it is not commented extension=php_intl.dll so I tried to look through dll files , I saw that there are many icu*.dll files in bin php folder which do not exists in apache bin folder so I just copy pasted them and bingo I am seeing intl in phpinfo page now why it has happenned?