How can I find where actually is the theme file?

I am new to Symfony and I need to work to a large project with many themes to modify them. How can I find where actually is the theme file in which module, just looking at the开发者_如何学C HTML browser output? Or do I need to look somewhere else, routing for example?

What you want to do is use the Web Debug Toolbar.

Once you have that running on the page, using appname_dev.php, simple click the view link and it will show you which templates have been used. If you need to know which layout to use then use logs link, click none the sfPHPView.