添加bz2扩展，编译报错：
configure: error: Please reinstall the BZip2 distribution
解决方案：
yum install -y bzip2 bzip2-devel
cd /usr/local/src/php-5.6.31/ext/bz2
/srv/php-5.6.31/bin/phpize
./configure –with-php-config=/srv/php-5.6.31/bin/php-config –with-bz2
make
make install