安装composer及切换镜像为国内镜像

一、下载composer

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"

下面的加密内容会改变，具体参考官网：https://getcomposer.org/download/：
php -r "if (hash_file('SHA384', 'composer-setup.php') === '544e09ee996cdf60ece3804abc52599c22b1f40f4323403c44d44fdfdd586475ca9813a858088ffbc1f233e9b180f061') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"

php composer-setup.php

php -r "unlink('composer-setup.php');"

mv composer.phar /usr/local/bin/composer;
安装完成执行composer，看到以下内容证明安装成功

二、更换为国内镜像

composer config -g repo.packagist composer https://packagist.phpcomposer.com

参考url：https://blog.csdn.net/zhezhebie/article/details/78432705