Run `composer install` in Web Browser

handle.php

<?php

declarce(strict_type=1);

use Composer\Console\Application;
use Composer\Command\UpdateCommand;
use Symfony\Component\Console\Input\ArrayInput;

define('COMPOSER_ROOT', __DIR__);

@set_time_limit(0);
@ini_set('memory_limit', -1);

chdir(COMPOSER_ROOT);

$input = new ArrayInput(['command' => 'install']);

$application = new Application();

$application->run($input);