how to install composer on centos 7 globally code example

Example 1: centos install copmposer

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" && php composer-setup.php --install-dir=/usr/local/bin --filename=composer

Example 2: centos 7 install php composer

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"