在CentOS上安裝php的管理套件composer

1. 直接依照官網的方式執行以下4個指令，就可以安裝composer
參考官網：https://getcomposer.org/download/

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === '48e3236262b34d30969dca3c37281b3b4bbe3221bda826ac6a9a62d6444cdb0dcd0615698a5cbe587c3f0fe57a54d8f5') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"

2. 然後再把composer.phar檔案放在/usr/local/bin底下

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

3. 就可以用以下指令來確認是否安裝成功

composer -v