How to add additional file type to New context menu.

Hello.
I'm using Eclipse PDT for php development but it should be the same for Java.
When I'm using right click on file explorer I have New menu to add new file.
Depending on what type of project I;m working (java or php) there are different file types that I can create
for Java there is .java for php there is .php , .html and so on.
I want to add additional file extension .phtml (yes Phtml) .
I know I can add phtml file by using other and simple file then just typing filename.phtml but its more time consuming.

How can I do this?
Is there any configuration file?
Best Regards
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