添加php扩展

#mkdir php


#cd php


#apt-get source php5


#cd php5-5.4.4/ext/pcntl

#phpize


#./configure


#make


#echo "extension=pcntl.so" > /etc/php5/mods-available/pcntl.ini


#ln -s /etc/php5/mods-available/pcntl.ini /etc/php5/conf.d/pcntl.ini