PHP roots and languageserver improvements (#2031)

Co-authored-by: Karl Grasegger <karl.grasegger@gebruederheitz.de>

book/src/generated/lang-support.md

@@ -46,7 +46,7 @@
 | ocaml-interface | ✓ |  |  |  |
 | org | ✓ |  |  |  |
 | perl | ✓ | ✓ | ✓ |  |
-| php | ✓ | ✓ | ✓ |  |
+| php | ✓ | ✓ | ✓ | `intelephense` |
 | prolog |  |  |  | `swipl` |
 | protobuf | ✓ |  | ✓ |  |
 | python | ✓ | ✓ | ✓ | `pylsp` |

languages.toml

@@ -428,7 +428,8 @@ scope = "source.php"
 injection-regex = "php"
 file-types = ["php"]
 shebangs = ["php"]
-roots = []
+roots = ["composer.json", "index.php"]
+language-server = { command = "intelephense", args = ["--stdio"] }
 indent = { tab-width = 4, unit = "    " }
 
 [[grammar]]