Using Psalm's Language Server

Psalm now has built-in Language Server Compatibility support.

It currently only supports diagnostics, with more functionality coming soon.

It works well in a variety of editors:

emacs

I got it working with eglot

This is the config I used:

(when (file-exists-p "vendor/bin/psalm-language-server")
  (progn
    (require 'php-mode)
    (require 'eglot)
    (add-to-list 'eglot-server-programs '(php-mode . ("php" "vendor/bin/psalm-language-server")))
    (add-hook 'php-mode-hook 'eglot-ensure)
    (advice-add 'eglot-eldoc-function :around
                (lambda (oldfun)
                  (let ((help (help-at-pt-kbd-string)))
                    (if help (message "%s" help) (funcall oldfun)))))
    )
  )

PhpStorm

I've got it working with this plugin: https://plugins.jetbrains.com/plugin/10209-lsp-support.

Setup is done via a GUI.

When you install the plugin you should see a "Language Server Protocol" section under the "Languages & Frameworks" tab.

In the "Server definitions" tab you should add a definition for Psalm:

Extension: php
Path: <path-to-php-binary> e.g. /usr/local/bin/php
- this should be an absolute path, not just php
Args: vendor/bin/psalm-language-server

In the "Timeouts" tab you can adjust the initialization timeout. This is important if you have a large project. You should set the "Init" value to the number of milliseconds you allow Psalm to scan your entire project and your project's dependencies.

Sublime Text

I use the excellent Sublime LSP plugin with the following config:

        "psalm":
        {
            "command": ["php", "vendor/bin/psalm-language-server"],
            "scopes": ["source.php", "embedding.php"],
            "syntaxes": ["Packages/PHP/PHP.sublime-syntax"],
            "languageId": "php"
        }

vim/neovim

ALE

Coming soon, but you can use the existing ALE Psalm plugin for now.

vim-lsp

I got it working with vim-lsp

This is the config I used:

au User lsp_setup call lsp#register_server({
     \ 'name': 'psalm-language-server',
     \ 'cmd': {server_info->[expand('vendor/bin/psalm-language-server')]},
     \ 'whitelist': ['php'],
     \ })

VS Code

Get the Psalm plugin here: https://marketplace.visualstudio.com/items?itemName=getpsalm.psalm-vscode-plugin

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