Add PHP file type icon (#7159)

Pyae Sone Aung created 

Add PHP file type icon from
[file-icons/icons](https://github.com/file-icons/icons)


[https://github.com/file-icons/icons/blob/master/svg/PHP.svg](https://github.com/file-icons/icons/blob/master/svg/PHP.svg)

<img width="408" alt="Screenshot 2024-01-31 at 23 14 55"
src="https://github.com/zed-industries/zed/assets/44226349/26c3d19d-3a5d-4fc6-b551-f5351ba62b7d">


Release Notes:

- Added PHP file type icon.

Change summary

assets/icons/file_icons/file_types.json | 5 ++++-
assets/icons/file_icons/php.svg         | 0 
2 files changed, 4 insertions(+), 1 deletion(-)

Detailed changes

assets/icons/file_icons/file_types.json 🔗 

@@ -74,7 +74,7 @@
         "ogg": "video",
         "pdb": "storage",
         "pdf": "document",
-        "php": "code",
+        "php": "php",
         "png": "image",
         "ppt": "document",
         "pptx": "document",
@@ -171,6 +171,9 @@
         "phoenix": {
             "icon": "icons/file_icons/phoenix.svg"
         },
+        "php": {
+            "icon": "icons/file_icons/php.svg"
+        },
         "prettier": {
             "icon": "icons/file_icons/prettier.svg"
         },