添加readline扩展，编译报错：
configure: error: Please reinstall libedit - I cannot find readline.h
解决方案：
yum install -y readline-devel
wget http://thrysoee.dk/editline/libedit-20170329-3.1.tar.gz
tar zxvf libedit-20170329-3.1.tar.gz
./configure
make
make install
cd /usr/local/src/php-5.6.31/ext/readline
/srv/php-5.6.31/bin/phpize
./configure --with-php-config=/srv/php-5.6.31/bin/php-config --with-readline
make
make install