Require PHP 7.4 and phpBB 3.3.19, and add a PHP lint workflow

.github/workflows/lint.yml

@@ -0,0 +1,38 @@
+name: Lint
+
+# PHP syntax check on the lowest PHP version this extension supports and the
+# newest one phpBB 3.3 supports. tests.yml covers PHP 8.2 with phpBB's own
+# checks (code sniffer, EPV).
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    name: PHP ${{ matrix.php }} lint
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: ['7.4', '8.4']
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+          tools: composer:v2
+
+      - name: PHP syntax check
+        run: find . -name '*.php' -not -path './.git/*' -not -path './vendor/*' -print0 | xargs -0 -n1 php -l
+
+      - name: Validate composer.json
+        run: composer validate --no-check-all --no-check-publish

README.md

@@ -13,8 +13,8 @@ See [docs/screenshots](docs/screenshots) for both themes rendered.
 
 ## Requirements
 
-* PHP 7.1 or later
-* phpBB 3.1.0-RC3 up to (but not including) 3.3
+* PHP 7.4 or later
+* phpBB 3.3.19 or later (3.3.x)
 
 ## Installation
 

composer.json

@@ -32,13 +32,13 @@
 		}
 	],
 	"require": {
-		"php": ">=7.1",
+		"php": ">=7.4",
 		"composer/installers": "^1.0"
 	},
 	"extra": {
 		"display-name": "Holiday Flare",
 		"soft-require": {
-			"phpbb/phpbb": ">=3.1.0-RC3,<3.3.*@dev"
+			"phpbb/phpbb": ">=3.3.19,<4.0.0@dev"
 		},
 		"version-check": {
 			"host": "www.phpbb.com",