jailshell composer

I can install composer when in a jailshell this way:

curl -sSk https://getcomposer.org/installer | php
#!/usr/bin/env php
All settings correct for using Composer
Downloading...

Composer successfully installed to: /home/user/composer.phar
Use it: php composer.phar

but when I try to use it, nothing happens. When logged in as root I can execute composer no problem.

When trying to install composer, I got this problem with no -k option:
~$ curl -sS https://getcomposer.org/installer | php
curl: (60) SSL certificate problem: unable to get local issuer certificate

 

Did you try to use sudo before that command?

 

It's a jailshell. sudo is not even installed on it. Nor would I want to have to run composer as su.

 

Yes, I installed php in the jail. I actually installed it through the jail:

curl -sSk https://getcomposer.org/installer | php