2 php versions on server (5.6 & 7). Trying to add pecl ssh2 ext to php version 5.6

Can someone help please?
The command:
pecl install ssh2-0.13
Outputs:
pecl/ssh2 requires PHP (version >= 4.0.0, version <= 6.0.0), installed version is 7.0.22-0ubuntu0.16.04.1

How can I install it to my php 5.6 ?
( php.ini file location is /opt/php-5.6.30/lib/php.ini )

 

Some more information.
When I installed the second php version I've used this howto:
https://www.howtoforge.com/tutorial/how-to-install-php-5-6-on-ubuntu-16-04/
I've tried to install it the same way xDebug is being installed in that guide.
cd /opt/php-5.6.30/etc
pecl -C ./pear.conf update-channels
pecl -C ./pear.conf install ssh2

But I get the same error message:
pecl/ssh2 requires PHP (version >= 4.0.0, version <= 6.0.0), installed version is 7.0.22-0ubuntu0.16.04.1

I will appreciate any help you can provide.

Thank you very much,

 

Also tried to change shell php alias to
alias php=/opt/php-5.6.30/bin/php
(didn't work )

 

Please help... I'm desperate.

 

Thank you for your answer,
As for PHP7 - you are correct, the apt package is the best solution.
As I wrote, I'm looking for a solution for the pecl ssh2 installation for php 5.6.
The main problem is PECL only detects the php7 installation even though I've entered the -C tag which supposed to load a custom configuration for the php 5.6 installation.

Have a nice day.

 

Done by changing the pecl script to always work through php5.6 version
( I've edited nano /usr/bin/pecl
and added this line after the first code block (after it checks the php version )

PHP="/opt/php-5.6.30/bin/php"

)

 

1. The client has a system that does not support php7 and needs ssh2 extension installed over php5.6 .
2. I've already noticed that you keep answering useless answers. Not only to me.
Thanks for trying helping me, but if you do not know the answer or a lead to the answer - please don't write useless words.

 

Hi Till,
Thank you. I guess this was the correct answer from the first place.
Thank you very much.