7.x 2.x kv

<?php
$kv = at_container('kv', 'collection_name');

// Get collection name
$kv->getCollectionName();

// Simple set
$kv->set('foo', 'bar');

// Only set if no current value at key `foo`
$kv->setIfNotExists('foo', 'baz');

// Output: bar
echo $kv->get('foo');

// Delete
$kv->delete($foo);

More examples at KVTest