Install APC (Alternative PHP Cache) in RHEL/CentOS 6/5
yum install php-pear php-devel httpd-devel pcre-devel gcc make
pecl install apc
echo “extension=apc.so” > /etc/php.d/apc.ini
service httpd restart
cp /usr/share/pear/apc.php /var/www/html/
vi /var/www/html/apc.php