Downgrade code to be PHP 7.0 compliant.

We need codechecker to continue working with PHP 7.0, because
it's used by moodle-plugin-ci that supports that version.

Hence, we have to downgrade code till it's decided to raise
requirements in both products.

Not much problem, only a few code recently introduced
(using some optional return type hinting that was added
with PHP 7.1) needs to be downgraded.

moodle/Util/MoodleUtil.php

@@ -84,7 +84,7 @@ protected static function loadCoreComponent(string $moodleRoot): bool {
      *
      * @return array Associative array of components as keys and paths as values or null if not found.
      */
-    protected static function calculateAllComponents(string $moodleRoot): ?array {
+    protected static function calculateAllComponents(string $moodleRoot) {
 
         // If we have calculated the components already, straight return them.
         if (!empty(self::$moodleComponents)) {
@@ -188,7 +188,7 @@ protected static function calculateAllComponents(string $moodleRoot): ?array {
      *
      * @return string|null a valid moodle component for the file or null if not found.
      */
-    public static function getMoodleComponent(File $file, $selfPath = true): ?string {
+    public static function getMoodleComponent(File $file, $selfPath = true) {
 
         // Verify that we are able to find a valid moodle root.
         if (! $moodleRoot = self::getMoodleRoot($file, $selfPath)) {
@@ -232,7 +232,7 @@ public static function getMoodleComponent(File $file, $selfPath = true): ?string
      *
      * @return int|null the numeric branch in moodle root version.php or null if not found
      */
-    public static function getMoodleBranch(?File $file = null, bool $selfPath = true): ?int {
+    public static function getMoodleBranch(File $file = null, bool $selfPath = true) {
 
         // Return already calculated value if available.
         if (self::$moodleBranch !== false) {
@@ -293,7 +293,7 @@ public static function getMoodleBranch(?File $file = null, bool $selfPath = true
      *
      * @return string|null the full path to moodle root or null if not found.
      */
-    public static function getMoodleRoot(?File $file = null, bool $selfPath = true): ?string {
+    public static function getMoodleRoot(File $file = null, bool $selfPath = true) {
 
         // Return already calculated value if available.
         if (self::$moodleRoot !== false) {

moodle/tests/moodleutil_test.php

@@ -142,7 +142,7 @@ public function getMoodleComponentProvider() {
      *
      * @dataProvider getMoodleComponentProvider
      */
-    public function test_getMoodleComponent(array $config, array $return, ?bool $reset = true, ?bool $selfPath = true) {
+    public function test_getMoodleComponent(array $config, array $return, bool $reset = true, bool $selfPath = true) {
         $file = null;
         // Set config options when passed.
         if ($config) {
@@ -240,7 +240,7 @@ public function getMoodleBranchProvider() {
      *
      * @dataProvider getMoodleBranchProvider
      */
-    public function test_getMoodleBranch(array $config, array $return, ?bool $reset = true, ?bool $selfPath = true) {
+    public function test_getMoodleBranch(array $config, array $return, bool $reset = true, bool $selfPath = true) {
         $file = null;
         // Set config options when passed.
         if ($config) {
@@ -342,7 +342,7 @@ public function getMoodleRootProvider() {
      *
      * @dataProvider getMoodleRootProvider
      */
-    public function test_getMoodleRoot(array $config, array $return, ?bool $reset = true, ?bool $selfPath = true) {
+    public function test_getMoodleRoot(array $config, array $return, bool $reset = true, bool $selfPath = true) {
         $file = null;
         // Set config options when passed.
         if ($config) {