#+TITLE: PHP layer

#+TAGS: general|layer|multi-paradigm|programming

[[file:img/php.png]]

* Table of Contents                     :TOC_5_gh:noexport:
- [[#description][Description]]
  - [[#features][Features:]]
- [[#install][Install]]
  - [[#layer][Layer]]
  - [[#backends][Backends]]
    - [[#lsp][LSP]]
      - [[#intelephense][intelephense]]
      - [[#php-language-server][php-language-server]]
      - [[#debugging][Debugging]]
    - [[#ac-php-core][ac-php-core]]
      - [[#setup][Setup]]
      - [[#refactoring][Refactoring]]
      - [[#debugging-1][Debugging]]
- [[#key-bindings][Key bindings]]
  - [[#general][General]]
  - [[#refactoring-for-non-lsp-backends][Refactoring for non LSP backends]]
  - [[#debugging-for-non-lsp-backends][Debugging for non LSP backends]]
  - [[#lsp-key-bindings][LSP key bindings]]
  - [[#debugging-for-lsp-backends][Debugging for LSP backends]]

* Description
This layer adds PHP language support to Spacemacs.

** Features:
- Edit PHP files using [[https://github.com/ejmr/php-mode][php-mode]]
- Edit Drupal files
- Complete and jump to define with [[https://github.com/xcwen/ac-php][company-php]]
- Run tests with PHPUnit
- Reformat code with PHP CBF
- Debug your programs with XDebug (via [[https://github.com/ahungry/geben][geben]] or [[https://github.com/emacs-lsp/dap-mode][dap-mode]])
- Refactor source files with help of [[https://github.com/emacs-php/phpactor.el][phpactor.el]]
- Support for the [[https://langserver.org/][Language Server Protocol]] (experimental)

The =gtags= layer is recommended to benefit from better =eldoc= and
=helm-gtags=.

* Install
** Layer
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
add =php= to the existing =dotspacemacs-configuration-layers= list in this
file.

** Backends
For php you have the choice between a set of possible backends with
different setup instructions and different capabilities.

*** LSP
Note that you'll need to use the =lsp= layer to enable these backends.

**** intelephense
This is the recommended LSP server solution. To activate it set the
layer variable =php-backend=:

#+BEGIN_SRC emacs-lisp
  (php :variables php-backend 'lsp)
#+END_SRC

and install the npm server with:

#+BEGIN_SRC sh
  npm install -g intelephense
#+END_SRC

You can find further information on the project's [[http://intelephense.net/][website]] and [[https://github.com/bmewburn/vscode-intelephense][GitHub page]].

**** php-language-server
This is an alternative LSP server implementation working on PHP basis rather
than nodejs. To activate it set the layer variable =php-backend= like for the
intelephense backend and install the server via [[https://getcomposer.org/][composer]]:

#+BEGIN_SRC sh
  composer require felixfbecker/language-server
  composer run-script --working-dir=vendor/felixfbecker/language-server parse-stubs
#+END_SRC

You can find further information on the project's [[https://github.com/felixfbecker/php-language-server][GitHub page]].

**** Debugging
In case of using any of LSP backends You can debug using [[https://microsoft.github.io/debug-adapter-protocol][dap]].

First of all You have to add =dap= to layer list of Your =dotspacemacs/layers=
function of a =.spacemacs= config file.

As mentioned in [[https://github.com/emacs-lsp/dap-mode#php][dap-mode doc for php]], dap-mode uses a [[https://marketplace.visualstudio.com/items?itemName=webfreak.debug][VSCode extension]] as a
debugging backend and includes a convenient =dap-php-setup= command to install
it into Your emacs. To embrace it open any PHP file in any PHP project just
after restarting emacs with =dap= layer enabled. Now You can call the extension
installation command: =<M-x> dap-php-setup=.

After that You can try to debug something. For example add a breakpoint to any
of Your phpunit tests with =SPC m d b a=. And start debugging with =SPC m d d d=
and selecting a debug template. Now run the test to ensure everything is
working. The command to run the test while debugging could look like this:

#+BEGIN_SRC sh
  php -d xdebug.idekey=PHPSTORM -d xdebug.remote_autostart=1 -d xdebug.remote_enable=1 -d xdebug.remote_host=127.0.0.1 -d xdebug.remote_port=9000 bin/phpunit ./path/to/Test.php
#+END_SRC

The test is now expected to be paused by emacs/dap when it catches code at the
breakpoint.

You may wish to propagate some config options for the VSCode extension which is
used as a debug server. For example if You are running Your code in a docker
container the project source path may differ between the container (and Xdebug
PHP extension consequently) and Emacs. The VSCode extension provides a config
option to map the path. In VSCode it is done by adding an appropriate json
config. For spacemacs it could be done for example by adding a next call to
=dotspacemacs/user-config= function of Your =.spacemacs= config:

#+BEGIN_SRC emacs-lisp
  (with-eval-after-load 'dap-php
    (dap-register-debug-template "PHP debug with custom path"
      (list :type "php"
            :cwd nil
            :request "launch"
            :name "Php Debug with path"
            :args '("--server=4711")
            :pathMappings (ht ("/docker/src/path" "/emacs/src/path"))
            :sourceMaps t)))
#+END_SRC

*** ac-php-core
This is a non server solution working entirely from an elisp package.
This requires no installation of external services but also delivers
the least amount of IDE like integrations with spacemacs.

To activate it just don't set the variable =php-backend= in your dotfile.
Remember that additional setup instructions are necessary on a per project basis
which you can find below.

**** Setup
Because of the way that the ac-php-core package works, there are a couple of
simple initialization tasks which must occur to get the completion working as it
should. On any new project make sure to perform the following initialization
tasks:
1. Run the following

   #+BEGIN_SRC shell
     cd /root/of/project
     touch .ac-php-conf.json
   #+END_SRC

2. Inside of spacemacs run:
   = ac-php-remake-tags =

The =.ac-php-conf.json= file is required to enable auto-completion. When you run
=ac-php-remake-tags= and your =.ac-php-conf.json= file is empty the default
configuration will be used and inserted in the file.

If your project contains the following files at the root folder:
1. =.projectile=
2. =vendor/autoload.php=

the necessary configuration file (=.ac-php-conf.json=) will be created
automatically if it does not exist.

**** Refactoring
This backend provides refactoring and class auto-completion capabilities via
[[https://github.com/emacs-php/phpactor.el][phpactor.el]]. To ensure that the phpactor package is intact, just run
=M-x phpactor-install-or-update= and the package itself will make sure that
you're good to go.

**** Debugging
While using ac-php-core debug capabilities are provided via the [[https://github.com/ahungry/geben][geben package]].
Please refer for details to the project page.

* Key bindings
** General

| Key binding | Description             |
|-------------+-------------------------|
| ~SPC m g g~ | jump to define at point |
| ~C-t~       | jump back               |

** Refactoring for non LSP backends
For more precise insights on the meaning of the key bindings please refer to
[[https://phpactor.github.io/phpactor/refactorings.html][phpactor API reference.]]

| Key binding   | Description                                             |
|---------------+---------------------------------------------------------|
| ~SPC m r i~   | import class under cursor                               |
| ~SPC m r r~   | rename local variable                                   |
| ~SPC m r R~   | rename variable in a whole file                         |
| ~SPC m r n~   | synchronize namespace with file location                |
| ~SPC m r v~   | toggle method visibility (public->protected->private)   |
| ~SPC m r g a~ | generate unknown property accessors                     |
| ~SPC m r g m~ | generate a method signature by a call example           |
| ~SPC m r c n~ | create a new class at a given path                      |
| ~SPC m r c c~ | copy current class elsewhere                            |
| ~SPC m r c m~ | move (rename) current class                             |
| ~SPC m r c i~ | generate an interface from class' public methods        |
| ~SPC m r p c~ | declare class properties by constructor signature       |
| ~SPC m r p p~ | add missing class properties                            |
| ~SPC m r e c~ | extract constant under cursor from a class              |
| ~SPC m r e e~ | extract expression to a variable                        |
| ~SPC m r e m~ | extract a code hunk to a method                         |
| ~SPC m r m c~ | add non-implemented stubs from parent classes/contracts |
| ~SPC m P s~   | ask phpactor about it's status                          |
| ~SPC m P u~   | install/update phpactor package                         |

** Debugging for non LSP backends
XDebug client management:

| Key binding | Description                                 |
|-------------+---------------------------------------------|
| ~SPC m d x~ | start XDebug client                         |
| ~SPC m d X~ | stop XDebug client                          |
| ~SPC m d b~ | set a predefined breakpoint on current line |
| ~SPC m d C~ | clear predefined breakpoints                |

Debugger interaction:

| Key binding | Description                                                      |
|-------------+------------------------------------------------------------------|
| ~o~ or ~n~  | step over statement                                              |
| ~s~ or ~i~  | step into current call                                           |
| ~r~         | step out of function                                             |
| ~c~         | resume execution until cursor position or next breakpoint        |
| ~e~         | evaluate expression in local context                             |
| ~L~         | focus line the execution stopped on                              |
| ~v~         | display context (local/global variables, user-defined constants) |
| ~b b~       | set breakpoint here                                              |
| ~b c~       | set conditional breakpoint here                                  |
| ~b e~       | set breakpoint on exception here                                 |
| ~u~         | unset breakpoint here                                            |
| ~U~         | clear all breakpoints (in all files!)                            |
| ~w~         | show current stack trace                                         |
| ~g f~       | find debugged file in a worktree                                 |
| ~q~         | quit debugging                                                   |

Variable listing:

| Key binding | Description                     |
|-------------+---------------------------------|
| ~j~         | next variable or section        |
| ~k~         | previous variable or section    |
| ~TAB~       | fold/unfold variable or section |
| ~q~         | close variable listing          |

** LSP key bindings
For a detailed list of key bindings in =lsp-mode= please checkout the README.org
file of the =lsp layer=.

** Debugging for LSP backends
See README.org file of the =dap-layer= for key bindings available in =dap-mode=