It is possible to mix Symfony Standard Edition with any other framework. It is not recommended, but it is possible. The most common situations when you need to do this is when you migrate your old code to Symfony and when you want a blogging system to handle the blogging part of your website (like having your website on Symfony and your blog on WordPress).
To achieve that there are many ways. One is to setup in Symfony a route that will work with the legacy code. Another one is to build an adapter over your non-Symfony application (or your Symfony app).
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solved Mixing PHP frameworks [closed]