Adding a variable for php for Visual Code looses the dollar sign

[montejunto]

If passing $variable it should provide \$variable or else it will show "variable" instead of "$variable" on visual Code.

[pawelgrzybek]

Hi.

Because VS Code snippets ate using $ for placeholders same like variable declaration in PHP this functionality will be tricky to add without some RegEx magic (I am not good at RegEx).

I am more than happy to accept your PR tho :)

Thanks for reporting.