Support PHP Ecosystem Code Indexing

Problem to Solve

PHP is widely used in web development and content management systems (WordPress, Laravel, Symfony, etc.). Many organizations rely on PHP for their core infrastructure and applications. Currently, the Knowledge Graph lacks PHP support, limiting code intelligence features for PHP developers.

Proposed Solution

Implement a PHP parser that extracts code entities (functions, classes, interfaces, traits, namespaces) and their relationships (imports, calls, implementations) so the Knowledge Graph can index and search PHP codebases intelligently.

/cc @michaelangeloio