Fatal error: Call to undefined function mb_strtolower()

Question

i have a vps server i installed nginx + php-fpm now i have a problem with mb_strtolower() function this is my php info pleas goto this adress to see my php info

Answer 1

Building on the answers from Phil Rykoff and omeinusch: this is my configure line to build php from source to support reportico 3.2 on php 5.4.43 / Centos 7.1.1503

/configure --with-apxs2=/opt2/canal/apache/bin/apxs --with-mysql
--with-pdo-mysql --prefix=/opt2/canal/php --enable-mbstring --with-gd

--enable-mbstring is pertinent to this question.
(--with-gd required from image handling (also needed yum install libpng-devel to avoid missing png.h message))

Then needed to set the following in php.ini:

zend.multibyte = On