[stable9] Execute parallel-lint

Backport of #22994 and #23303

.travis.yml

@@ -29,6 +29,7 @@ install:
 
 
 script:
+  - sh -c "if [ '$TC' = 'syntax' ]; then composer install && vendor/bin/parallel-lint --exclude vendor/jakub-onderka/ --exclude 3rdparty/symfony/polyfill-php70/Resources/stubs/ --exclude 3rdparty/patchwork/utf8/src/Patchwork/Utf8/Bootup/ --exclude 3rdparty/paragonie/random_compat/lib/ .; fi"
   - sh -c "if [ '$TEST_DAV' != '1' ]; then echo \"Not testing DAV\"; fi"
   - sh -c "if [ '$TEST_DAV' = '1' ]; then echo \"Testing DAV\"; fi"
 
@@ -42,5 +43,13 @@ matrix:
       env: DB=sqlite;TC=carddav
     - php: 5.4
       env: DB=sqlite;TC=caldav
+    - php: 5.4
+      env: DB=sqlite;TC=syntax
+    - php: 5.5
+      env: DB=sqlite;TC=syntax
+    - php: 5.6
+      env: DB=sqlite;TC=syntax
+    - php: 7.0
+      env: DB=sqlite;TC=syntax
 
   fast_finish: true

composer.json

@@ -0,0 +1,6 @@
+{
+  "require-dev": {
+    "jakub-onderka/php-parallel-lint": "^0.9.2",
+    "jakub-onderka/php-console-highlighter": "^0.3.2"
+  }
+}