Get the metadata from a Google Cloud Platform environment.
$ composer install kreait/gcp-metadatause Kreait\GcpMetadata;
$metadata = new GcpMetadata();$isAvailable = $metadata->isAvailable();$data = $metadata->instance();$data = $metadata->project();$data = $metadata->instance('hostname');use Kreait\GcpMetadata;
$metadata = new GcpMetadata();
if ($metadata->isAvailable()) {
    echo $metadata->instance('hostname');
}
try {
    echo $metadata->instance('hostname');   
} catch (GcpMetadata\Error $e) {
    echo $e->getMessage();
}