Ubuntu安装composer
1.下载composer.pharcd /home/anfang/Downloads
wget https://getcomposer.org/composer.phar
2.重命名composer.phar为composer
mv composer.phar composer
3.增加可执行权限
chmod +x composer
4.现在可以通过./composer 命令运行composer，但这只仅限于在当前目录运行。要想全局使用，composer ，要设置把它为全局变量。找到composer文件，把它移到/usl/local/bin 目录，这样就可以在全局使用composer 命令。
sudo mv composer /usr/local/bin
http://i2.运维网.com/images/blog/201812/27/073903cd42559855d3e04b0cb163a913.png
国内源
composer config -g repo.packagist composer https://packagist.phpcomposer.com
具体地址：https://pkg.phpcomposer.com/
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