Visual Studio 2013 is quite old. Modern alternatives offer better PHP support:
Another dedicated plugin designed to turn VS into a full-featured PHP IDE.
Start with clean PHP web project structures. Deployment: Easy publish via FTP or Azure.
If you don't want to install extensions, you can still edit files:
Offers a free trial; usually requires a paid license for full features. 📦 Alternative: VS.Php by JPM Software
Much faster with updated "PHP Tools" compatibility.
Syncs CSS and JavaScript alongside PHP files.