NeoVim as php IDE - Single file setup

.vimrc

call plug#begin('~/.local/share/nvim/plugged')
Plug 'tpope/vim-fugitive'
Plug 'airblade/vim-gitgutter'
Plug 'martinda/Jenkinsfile-vim-syntax'
Plug 'c9s/phpunit.vim'
Plug 'scrooloose/nerdtree'
Plug 'jistr/vim-nerdtree-tabs'
Plug 'kien/ctrlp.vim'
Plug 'easymotion/vim-easymotion'
Plug 'StanAngeloff/php.vim'
Plug 'tiagofumo/vim-nerdtree-syntax-highlight'
Plug 'tpope/vim-sleuth'
Plug 'joonty/vdebug'
Plug 'MaxSt/FlatColor'
Plug 'janko-m/vim-test'
Plug 'tpope/vim-cucumber'
Plug 'vim-airline/vim-airline'
Plug 'majutsushi/tagbar'
" PHP support NVIM
Plug 'autozimu/LanguageClient-neovim', { 'do': ':UpdateRemotePlugins' }
Plug 'junegunn/fzf'
Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
Plug 'Shougo/echodoc.vim'
call plug#end()

"" Maps additional php extensions
autocmd FileType * setlocal formatoptions-=c formatoptions-=r formatoptions-=o
if has("autocmd")
  augroup module
    autocmd BufRead,BufNewFile *.module set filetype=php
    autocmd BufRead,BufNewFile *.install set filetype=php
    autocmd BufRead,BufNewFile *.test set filetype=php
    autocmd BufRead,BufNewFile *.inc set filetype=php
    autocmd BufRead,BufNewFile *.profile set filetype=php
    autocmd BufRead,BufNewFile *.view set filetype=php
  augroup END
endif

"" Show line numbers.
set number
set relativenumber

"" Automatic indentation.
filetype indent on

"" Reloads the vim config after saving.
augroup myvimrc
        au!
        au BufWritePost .vimrc,_vimrc,vimrc,.gvimrc,_gvimrc,gvimrc so $MYVIMRC | if has('gui_running') | so $MYGVIMRC | endif
augroup END

inoremap <expr> <Tab> pumvisible() ? "\<C-n>" : "\<Tab>"
inoremap <expr> <S-Tab> pumvisible() ? "\<C-p>" : "\<S-Tab>"

"" Nerd tree
let g:nerdtree_tabs_open_on_console_startup=0
let g:NERDTreeDirArrowExpandable = '▸'
let g:NERDTreeDirArrowCollapsible = '▾'
""" Key: CTRL+n         | Toggle tree
map <C-n> :NERDTreeToggle<CR>

"" TestSuite
" Runner
let test#strategy = "neovim"
let test#php#cucumber#executable = 'tests/behat -c tests/behat.yml'
let test#ruby#cucumber#executable = 'tests/behat -c tests/behat.yml'
let test#php#phpunit#executable = 'vendor/bin/phpunit'
""" Key: $mod+t         | Test nearest
""" Key: $mod+T         | Test File
""" Key: $mod+a         | Test suite
""" Key: $mod+l         | Test Test last
""" Key: $mod+g         | Test Visit
nmap <silent> <leader>t :TestNearest<CR>
nmap <silent> <leader>T :TestFile<CR>
nmap <silent> <leader>a :TestSuite<CR>
nmap <silent> <leader>l :TestLast<CR>
nmap <silent> <leader>g :TestVisit<CR>
" Maps .feature extension to cucumber
augroup filetypedetect
        au! BufReadPre,BufReadPost,BufRead,BufNewFile *.feature setfiletype cucumber
augroup END

"" Tagbar
autocmd FileType * nested :call tagbar#autoopen()
""" key: $mod+F8        | Action: Toggle tagbar
nmap <leader><F8> :TagbarToggle<CR>
let g:tagbar_autofocus = 0
let g:tagbar_compact = 1

"" Php autocomplete
" Disable diagnostics
let g:LanguageClient_diagnosticsDisplay = {}
" Deoplete config
"let g:deoplete#auto_complete_start_length=1
"let g:deoplete#omni_patterns = {}
" Required for operations modifying multiple buffers like rename.
set hidden
let g:LanguageClient_serverCommands = {
    \ 'php': ['php', '/home/rob/test/vendor/bin/php-language-server.php'],
    \ }
let g:deoplete#enable_at_startup = 1
""" Key: K                | Action: Hover
""" Key: gd               | Action: go to definition
""" Key: f2               | Action: Rename
nnoremap <silent> K :call LanguageClient_textDocument_hover()<CR>
nnoremap <silent> gd :call LanguageClient_textDocument_definition()<CR>
nnoremap <silent> <F2> :call LanguageClient_textDocument_rename()<CR>

"" Git gutter.
let g:gitgutter_sign_column_always = 1

"" Visual settings
if has('nvim')
    let $NVIM_TUI_ENABLE_TRUE_COLOR=1
endif
colo flatcolor
let g:flatcolor_termcolors = 16
set encoding=utf-8
set colorcolumn=80
syntax on

"" Clipboard
set clipboard=unnamedplus

"" Vdebug
let g:vdebug_options= {
  \    "port" : 9000,
  \    "server" : '',
  \    "timeout" : 20,
  \    "on_close" : 'detach',
  \    "break_on_open" : 0,
  \    "ide_key" : '',
  \    "path_maps" : {},
  \    "debug_window_level" : 0,
  \    "debug_file_level" : 0,
  \    "debug_file" : "",
  \    "watch_window_style" : 'compact',
  \    "marker_default" : '⬦',
  \    "marker_closed_tree" : '▸',
  \    "marker_open_tree" : '▾'
  \ }

I am using this configuration but i got this error at the bottom of neovim.

{"jsonrpc": "2.0", "error": {"message": "ErrorException: file_get_co...t\\Loop\\run()\n#20 {main}", "data": null, "code": -32603}, "id": 0}

Is this configuration still work ?

may be you would like to try the phpcd.vim

What about ctags?