sudo apt install composer

执行composer update 报错 查看composer.json "PHPunit/PHPunit": "~5.7"

PHPunit 没有安装

解决办法：

sudo apt-get install PHPunit

将composer.json "PHPunit/PHPunit": "~5.7"

改成："*"

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sudo curl -sS https://getcomposer.org/installer | sudo PHP -d detect_unicode=Off

sudo mv composer.phar /usr/local/bin/composer

sudo chmod a+x composer

sudo composer self-update

sudo composer config -g repo.packagist composer https://packagist.PHPcomposer.com

http://www.PHPcomposer.com/

http://docs.PHPcomposer.com/00-intro.html#Downloading-the-Composer-Executable