How to enable extension=intl.so to php

[pandabb]

Hello, how do i add this extension=intl.so to php ?

oS: Centos 7
i tried the following, failed at step 3.

step1 - sudo yum install libicu
step2 - sudo yum install libicu-devel.x86_64

step3 - sudo /usr/bin/pecl install intl
step4 - add “extension=intl.so” in your php.ini file. "for vestacp how do i properly add this"

You can also check what extensions are compiled in by running:
php -m

Thanks!