Install APC

we need the pecl command so we can download and install APC from the repositories.

• use yum to install pecl

yum install php-pear php-devel httpd-devel

• install APC

pecl install apc 

at the end you can read

Build process completed successfully
Installing '/usr/lib/php/modules/apc.so'
install ok: channel://pecl.php.net/APC-3.0.19
configuration option "php_ini" is not set to php.ini location
You should add "extension=apc.so" to php.ini

open php.ini, find

;;;;;;;;;;;;;;;;;;;;;;
; Dynamic Extensions ;
;;;;;;;;;;;;;;;;;;;;;;

add this line under it extension=apc.so save & exit, and restart the service

/etc/init.d/php_cgi restart

for apache

/etc/init.d/httpd restart