Use different PHP version CLI executable for one command

Default PHP executable can be found using:

$ which php

In most cases it is link to particular PHP version:

lrwxrwxrwx 1 root root      21 aug 15  2016 /usr/bin/php -> /usr/bin/php7.1

To change it to different version just relink it to another

$ sudo rm /usr/bin/php

$ sudo ln -s /usr/bin/php5.6 /usr/bin/php

Before relink you have to make sure target PHP version is installed.

Maybe you can try to fix the environnement!

$ php -v
PHP 5.4.x (cli) ...
$ set PATH="/usr/lib64/php5.6/bin:$PATH"
$ php -v
PHP 5.6.x (cli) ...

Or, if you don't want to modify the PATH for your shell session, you can scope the change for the current command only:

$ php -v
PHP 5.4.x (cli) ...
$ env PATH="/usr/lib64/php5.6/bin:$PATH" php -v
PHP 5.6.x (cli) ...
$ php -v
PHP 5.4.x (cli) ...

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