What is the easiest way to run console php utilities (composer) through another php file?

Question

PHP

I need to run composer through my code i.e. I am writing a small script that should expand the site on some event, while exec and similar functions are often blocked, because. composer is an archive of php files, then I thought maybe you can just include it and run it yourself?
maybe something is ready? those. something like

<?php
$lib = new lib('./composer.phar');
$lib->run('install');

thanks
update.
While it seems to run:

$_SERVER['argv'][1] = 'install';
include __DIR__ . '/composer.phar';

Answer 1

a small script that, on some event, should expand the site

https://ru.wikipedia.org/wiki/Bash

Answer 2

while exec and similar functions are often blocked

So deal with the cause, not the effect.
Disabling these features is not justified.