Composer

Step 1:进入安装目录
cd /usr/local/bin
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Step 2:下载并安装
sudo curl -s https://getcomposer.org/installer | sudo php
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Step 3:添加执行权限
sudo chmod a+x composer.phar
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Step 4:加入全局命令：
mv composer.phar /usr/local/bin/composer
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Step 5:更新，查看版本号
sudo composer.phar self-update
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查看版本号

composer --version