[root@localhost src]# curl -sS https://getcomposer.org/installer | php
Some settings on your machine make Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:

The openssl extension is missing, which means that secure HTTPS transfers are impossible.
If possible you should enable it or recompile php with --with-openssl

[root@localhost php]# php --ini
Configuration File (php.ini) Path: /usr/local/php-7.1.17/lib
Loaded Configuration File:         (none)
Scan for additional .ini files in: (none)
Additional .ini files parsed:      (none)

[root@localhost php]# ln -s /home/sc/php/php7-9026.ini /usr/local/php/lib/php.ini

[root@localhost lib]# php --ini
Configuration File (php.ini) Path: /usr/local/php-7.1.17/lib
Loaded Configuration File:         /usr/local/php-7.1.17/lib/php.ini
Scan for additional .ini files in: (none)
Additional .ini files parsed:      (none)

curl -sS https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer