php - Composer install failed

Question

I'm trying to install composer in my Ubuntu 16.04 with PHP version 5.6.*.

I used:curl -sS https://getcomposer.org/installer | php. But it is giving me error as follows:

All settings correct for using Composer
Downloading...
The "https://getcomposer.org/versions" file could not be downloaded: failed to open stream: Connection refused
Retrying...
The "https://getcomposer.org/versions" file could not be downloaded: SSL operation failed with code 1. OpenSSL Error messages:
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
Failed to enable crypto
failed to open stream: operation failed
Retrying...
The "https://getcomposer.org/versions" file could not be downloaded: SSL operation failed with code 1. OpenSSL Error messages:
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
Failed to enable crypto
failed to open stream: operation failed
The download failed repeatedly, aborting.

I do not have composer installed previously.

Answer 1

I solved the issue by downloading https://curl.haxx.se/ca/cacert.pem and giving it's path in my etc/php/5.6/cli/php.ini and etc/php/5.6/apache2/php.ini.

Then after running sudo service apache2 restart && sudo apt install composer just worked fine.