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