以下这些步骤对我有帮助，以防万一您使用的是 OSX

These below steps helped me, Just in case if you are using OSX

来自 http://www.phpzce 的步骤.com/blog/view/15/installing-intl-package-on-your-mac-with-xampp

1. 检查设置了哪个php路径，即

1. Check which php path is set i.e.

root$: which php

/Applications/XAMPP/xamppfiles/bin/php 

/usr/bin/php 

root$: PATH="/Applications/XAMPP/xamppfiles/bin:${PATH}" 

root$: brew install icu4c 

root$: sudo pecl update-channels 
root$: sudo pecl install intl 

root$: php -m | grep intl #should return 'intl' 

完成

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============================

注意:

• 从 /Applications/XAMPP/xamppfiles/etc/php.ini 文件中的扩展列表添加/取消注释 extension=intl.so 行.并重新启动Apache.谢谢@pazhyn

• From extensions list in /Applications/XAMPP/xamppfiles/etc/php.ini file Add / Uncomment extension=intl.so line. And restart Apache. Thanks @pazhyn

在安装intl"之前，如果你还没有安装 Autoconf，你必须先安装它.谢谢@Digant

Before installing "intl" you have to install Autoconf if you have not installed it. Thanks @Digant

• 通过 Homebrew brew install autoconf automake或

• 通过运行下面的命令

• via Homebrew brew install autoconf automake or

• by running below commands

curl -OL http://ftpmirror.gnu.org/autoconf/autoconf-latest.tar.gz
tar xzf autoconf-latest.tar.gz
cd autoconf-*
./configure --prefix=/usr/local
make
sudo make install
cd ..
rm -r autoconf-*