It seems that symbols are not being displayed in VSCode (both stable and insider builds) for certain files. When opening some PHP files, then showing the symbols pane, I get the error message:
No symbols found in document 'myfile.php'`
In other files it seems to work fine. (Unfortunately I can't paste the file here, as it is licensed.)
There was a bug with variable variables $$foo that was preventing symbols from showing. Should be resolved now in v1.0.0
I have a file that's tripping on this too, but I'm not seeing any variable variables. I'll try to reduce and see what's causing it to trip up.
--edit
It looks like in my case it was leading slashes on use statements:
<?php
use \Phalcon\Db\Column as Column;
use \Phalcon\Db\Index as Index;
use \Phalcon\Db\Reference as Reference;
...
causes the no symbols error where as
<?php
use Phalcon\Db\Column as Column;
use Phalcon\Db\Index as Index;
use Phalcon\Db\Reference as Reference;
...
behaves as expected.
This is also happening for me and seems like a bug. Can confirm that any use statements with a preceding slash causes the problem as outlined by @jellisii.
@bmewburn is this something you'd be willing to include in a patch release, I could look into making a PR for it. Seems like lots of projects are going to have the root namespace aliasing in use.
Edit: _after looking at the source a bit more, i'm not sure what introduced this change from version 0.8.8 to version 1.0.2, would be happy to help if I can, but in terms of making a PR I'll need a little extra direction because it turns out I've got no idea how this thing works!_ 馃槀
I am finding that it is also prepending slashes on functions like array_key_exists().
Found a workaround until this gets patched. Code lets you install other versions of an extension now. Installing 0.8.8 brings back the expected functionality.

@jellisii thanks for narrowing it down
Thanks Ben!
Most helpful comment
Found a workaround until this gets patched. Code lets you install other versions of an extension now. Installing 0.8.8 brings back the expected functionality.