Every time you update your CentOS Linux and the update includes a new kernel image update the system will not remove your old kernel but it will cumulatively add new kernel to the top of your Linux kernel installed list. Normally, this does not present any issue to your running system and you are not required to take any action to remove any old and unused kernel images.
The following steps walks through the installation of mongo and mbstring modules for php. This is helpful when you are required to install specific versions of the modules along with your PHP package.
Installation on CentOS of php-mbstring is straightforward as you just can get the package from the Epel-repo or on the Optional Packages repo.
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