Install APC for PHP in CentOS

yum install pcre-devel gcc httpd-devel php-pear
pecl install apc
64bit: restorecon /usr/lib64/php/modules/apc.so
32bit: restorecon /usr/lib/php/modules/apc.so
echo "extension=apc.so" > /etc/php.d/apc.ini
service httpd restart