Run composer from within a PHP script calling the binary programmatically

composer.json

{
  "require-dev": {
    "symfony/console": "dev-master",
    "composer/composer": "dev-master"
  }
}

composer.php

<?php

require 'vendor/autoload.php' // require composer dependencies

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

// Composer\Factory::getHomeDir() method
// needs COMPOSER_HOME environment variable set
putenv('COMPOSER_HOME=' . __DIR__ . '/vendor/bin/composer');

// call `composer install` command programmatically
$input = new ArrayInput(array('command' => 'install'))
$application = new Application();
$application->setAutoExit(false); // prevent `$application->run` method from exitting the script
$application->run();

echo "Done.";

rdf:RDF
<cc:Work
rdf:about="">
dc:formatimage/svg+xml</dc:format>
<dc:type
rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
dc:title</dc:title>
</cc:Work>
</rdf:RDF>