MAC下laravel执行
php artisan serv发生错误如下
php artisan serv
dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.63.dylib
  Referenced from: /usr/local/bin/php
  Reason: image not found
[1]    55973 abort      php artisan serv
具体的解决办法是执行下面的命令
brew switch icu4c 63.1当然,你的电脑里面可能没有这个63.1,试试其他版本,比如我在切换到62.1时失败,提示如下:
brew switch icu4c 62.1
Error: icu4c does not have a version "62.1" in the Cellar.
icu4c installed versions: 63.1, 64.2就是我电脑安装了 63.1, 64.2 所以这里我需要执行brew switch icu4c 63.1。所以根据你的提示把已安装的都试一下,一般换成低版本就好了。