centos7 Linux安装composer

    php72 -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"

    php72 composer-setup.php

    cp composer.phar  /usr/bin/composer

    php72 -r "unlink('composer-setup.php');"

    sudo ln -s /usr/bin/php72 /usr/bin/php