src/Tomahawk/DependencyInjection/Container.php
public function findTaggedServiceIds($tag)
    {
        $ids = [];

        foreach ($this->serviceTags as $id => $tags) {
            if (in_array($tag, $tags)) {
                $ids[] = $id;
            }
        }

        return $ids;
    }
public function findTaggedServiceIds($tag)
    {
        $ids = [];

        foreach ($this->serviceTags as $id => $tags) {
            if (in_array($tag, $tags)) {
                $ids[] = $id;
            }
        }

        return $ids;
    }
Find all service ids with a given tag

@param string $tag
@return array