##安装pear&pecl并更新

cd /usr/lib/php 
sudo php install-pear-nozlib.phar 
Edit:
/etc/php.ini and find the line: ; 
include_path = ".:/php/includes" 
修改为: 
include_path = ".:/usr/lib/php/pear" 
sudo pear channel-update pear.php.net 
sudo pecl channel-update pecl.php.net 
sudo pear upgrade-all

##安装依赖icu

wget http://download.icu-project.org/files/icu4c/55.1/icu4c-55_1-src.tgz
tar xvzf icu4c-55_1-src.tgz
cd icu4c-55_1-src
./configure
make
make install

##安装

sudo pecl install intl