This package was highly inspired from ocramius/package-versions
I needed some methods to read data from the composer.lock file fast...this is the result
$bool = \PackageInfo\Package::isInstalled('vendor/package-name'); // return true/false
// may throw PackageNotInstalledException if the package is not installed
$package = new \PackageInfo\Package('vendor/package-name');
$package->getName();
$package->getDescription();
$package->getVersion();
$package->getType();
$package->getKeywords();
// ...