Automatically generate the namespace & class depending on where the file is saved

namespace.sublime-snippet.xml

<!--

File is located at:

  /Users/Eric/Sites/MyApp/src/MyApp/Bundle/BlogBundle/Entity/Blog/Post.php

Problem:

    No way to double-substitute or chain filters

Expected Output:

    namespace MyApp\Bundle\BlogBundle\Entity\Blog;

    class Post
    {
    
    }

Actual Output:

    namespace MyApp/Bundle/BlogBundle/Entity/Blog;

    class Post
    {
        
    }

-->

<snippet>
    <content><![CDATA[
namespace ${TM_FILEPATH/^.+\/[a-z]+\/([\w\/]+)\/\w+\.php$/$1/};

class ${TM_FILENAME/^([\w\/]+)\.php$/$1/}
{
    ${0}
}
]]></content>
    <tabTrigger>namespace</tabTrigger>
    <scope>source.php</scope>
</snippet>

I had a similar problem, and finally I managed to solve it. For you it should look like this:

namespace MyApp${TM_FILEPATH/(?:.*MyApp)|(\/)([^\/]+)(?=\/)|(?:\/[^\/]+\.php$)/(?1:\\$^N:$^N)/g};

For me using Laravel, the path is /home/user/git/laravel-project/app/... and should be replaced by App:

namespace App${TM_FILEPATH/(?:.*app)|(\/)([^\/]+)(?=\/)|(?:\/[^\/]+\.php$)/(?1:\\$^N:$^N)/g};

I've taken the solution from Sublime Text snippet to insert PSR-0 namespace and adjusted it just a little bit.

The substitution for the classname could also be done a little bit shorter (just strip the .php suffix):

class ${TM_FILENAME/\.php$//}