# Tutorial posts

FusionAuth Blog | Access tutorials to implement and optimize authentication solutions.

> For the index of this section of the site, see [llms.txt](https://fusionauth.io/blog/llms.txt)
>
> For the complete documentation index, see [llms.txt](https://fusionauth.io/docs/llms.txt)

[Securing your legacy PHP business application with OAuth](https://fusionauth.io/blog/updating-crufty-php-application.md)

### [Securing your legacy PHP business application with OAuth](https://fusionauth.io/blog/updating-crufty-php-application.md)

Sometimes applications get written by interns. Sometimes prototypes get put into production. Sometimes crufty old apps, called "legacy" by some, are termed...

[Dan Moore](https://fusionauth.io/blog/author/dan-moore.md)

October 7, 2020