community: Add PHP language parser to document_loaders (#19850)

**Description:**
Added a PHP language parser to document_loaders
**Issue:** N/A
**Dependencies:** N/A
**Twitter handle:** N/A

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>

libs/community/langchain_community/document_loaders/parsers/language/language_parser.py

@@ -18,6 +18,7 @@ from langchain_community.document_loaders.parsers.language.javascript import (
 from langchain_community.document_loaders.parsers.language.kotlin import KotlinSegmenter
 from langchain_community.document_loaders.parsers.language.lua import LuaSegmenter
 from langchain_community.document_loaders.parsers.language.perl import PerlSegmenter
+from langchain_community.document_loaders.parsers.language.php import PHPSegmenter
 from langchain_community.document_loaders.parsers.language.python import PythonSegmenter
 from langchain_community.document_loaders.parsers.language.ruby import RubySegmenter
 from langchain_community.document_loaders.parsers.language.rust import RustSegmenter
@@ -42,6 +43,7 @@ LANGUAGE_EXTENSIONS: Dict[str, str] = {
     "pl": "perl",
     "ts": "ts",
     "java": "java",
+    "php": "php",
 }
 
 LANGUAGE_SEGMENTERS: Dict[str, Any] = {
@@ -60,6 +62,7 @@ LANGUAGE_SEGMENTERS: Dict[str, Any] = {
     "perl": PerlSegmenter,
     "ts": TypeScriptSegmenter,
     "java": JavaSegmenter,
+    "php": PHPSegmenter,
 }
 
 Language = Literal[

libs/community/langchain_community/document_loaders/parsers/language/php.py

@@ -0,0 +1,35 @@
+from typing import TYPE_CHECKING
+
+from langchain_community.document_loaders.parsers.language.tree_sitter_segmenter import (  # noqa: E501
+    TreeSitterSegmenter,
+)
+
+if TYPE_CHECKING:
+    from tree_sitter import Language
+
+
+CHUNK_QUERY = """
+    [
+        (function_definition) @function
+        (class_declaration) @class
+        (interface_declaration) @interface
+        (trait_declaration) @trait
+        (enum_declaration) @enum
+        (namespace_definition) @namespace
+    ]
+""".strip()
+
+
+class PHPSegmenter(TreeSitterSegmenter):
+    """Code segmenter for PHP."""
+
+    def get_language(self) -> "Language":
+        from tree_sitter_languages import get_language
+
+        return get_language("php")
+
+    def get_chunk_query(self) -> str:
+        return CHUNK_QUERY
+
+    def make_line_comment(self, text: str) -> str:
+        return f"// {text}"