From the docs: https://getcomposer.org/download/ Please use the commands from the doc as the latest version will be posted there. The code example that follows is just an example:
As the root user and in the root of your project directory run:
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === 'dac665fdc30fdd8ec78b38b9800061b4150413ff2e3b6f88543c636f7cd84f6db9189d43a81e5503cda447da73c7e5b6') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"
Then run:
sudo mv composer.phar /usr/local/bin/composer
Updates to your /usr/share/httpd:
create .cache/composer/vcs and change the owner of .cache chown -R apache:apache
Now you can run composer commands in the root of your project where the composer.json file is located.
Next, in your /usr/share/httpd create .bash_rc and .bash_profile files. In .bash_profile source .bashrc as:
source /usr/share/httpd/.bashrc
and in your .bashrc file add your composer and drush paths as:
export PATH=$PATH:/usr/local/bin export PATH="$HOME/.composer/vendor/bin:$PATH" alias drush='[full path to site directory]/vendor/drush/drush/drush'
After running composer initially the contents of the /usr/share/httpd will look something like this:
drwxr-xr-x 7 root root 4096 Jun 21 10:22 .
drwxr-xr-x. 103 root root 4096 Jun 3 21:11 .. -rw-r--r-- 1 root root 32 Jun 21 10:21 .bash_profile -rw-r--r-- 1 root root 160 Jun 21 10:22 .bashrc drwxr-xr-x 3 apache apache 4096 Jun 21 10:26 .cache drwxr-xr-x 3 root root 4096 Jun 20 11:25 error drwxr-xr-x 3 root root 20480 Jun 20 11:25 icons drwxr-xr-x 2 root root 4096 Jun 20 11:25 noindex drwx------ 2 apache apache 4096 Jun 20 15:46 .ssh
Also, on the initial composer run you might be asked for your github password. Also it might be necessary to create a /usr/share/httpd/.config/composer/auth.json file then rerun composer for it to complete.