Minor - GH action set diff format in php_cs

.github/workflows/php_cs.yml

@@ -48,4 +48,4 @@ jobs:
           '
           CHANGED_FILES=$(git diff --name-only --diff-filter=ACMRTUXB "HEAD~..HEAD")
           if ! echo "${CHANGED_FILES}" | grep -qE "^(\\.php-cs-fixer(\\.dist)?\\.php|composer\\.lock)$"; then EXTRA_ARGS=$(printf -- '--path-mode=intersection\n--\n%s' "${CHANGED_FILES}"); else EXTRA_ARGS=''; fi
-          php ./php-cs-fixer.phar fix --config=.php-cs-fixer.php -v --dry-run --using-cache=no --diff ${EXTRA_ARGS}
+          php ./php-cs-fixer.phar fix --config=.php-cs-fixer.php -v --dry-run --using-cache=no --diff --diff-format=udiff ${EXTRA_ARGS}