Explicit nullable type

Author: tvdijen

src/AbstractElement.php

@@ -36,7 +36,7 @@ abstract class AbstractElement implements SerializableElementInterface
      * @param \DOMElement|null $parent The element we should append to.
      * @return \DOMElement
      */
-    public function instantiateParentElement(DOMElement $parent = null): DOMElement
+    public function instantiateParentElement(?DOMElement $parent = null): DOMElement
     {
         $qualifiedName = $this->getQualifiedName();
         $namespace = static::getNamespaceURI();

src/Base64ElementTrait.php

@@ -60,5 +60,5 @@ abstract public static function getLocalName(): string;
      * @param \DOMElement|null $parent The element we should append to.
      * @return \DOMElement
      */
-    abstract public function instantiateParentElement(DOMElement $parent = null): DOMElement;
+    abstract public function instantiateParentElement(?DOMElement $parent = null): DOMElement;
 }

src/BooleanElementTrait.php

@@ -58,7 +58,7 @@ public static function fromXML(DOMElement $xml): static
      * @param \DOMElement|null $parent
      * @return \DOMElement
      */
-    final public function toXML(DOMElement $parent = null): DOMElement
+    final public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = $this->instantiateParentElement($parent);
         $e->textContent = $this->getContent();

src/Chunk.php

@@ -99,7 +99,7 @@ public function getNamespaceURI(): ?string
      *
      * @param string|null $namespaceURI
      */
-    protected function setNamespaceURI(string $namespaceURI = null): void
+    protected function setNamespaceURI(?string $namespaceURI = null): void
     {
         Assert::nullOrValidURI($namespaceURI, SchemaViolationException::class);
         $this->namespaceURI = $namespaceURI;
@@ -133,7 +133,7 @@ public function getPrefix(): string
      *
      * @param string|null $prefix
      */
-    protected function setPrefix(string $prefix = null): void
+    protected function setPrefix(?string $prefix = null): void
     {
         $this->prefix = strval($prefix);
     }
@@ -304,7 +304,7 @@ public static function fromXML(DOMElement $xml): static
      * @param  \DOMElement|null $parent The element we should append this element to.
      * @return \DOMElement The new element.
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         if ($parent === null) {
             $doc = DOMDocumentFactory::create();

src/ExtendableAttributesTrait.php

@@ -93,7 +93,7 @@ public function getAttributesNS(): array
      *
      * @return array<int, \SimpleSAML\XML\Attribute> $attributes
      */
-    protected static function getAttributesNSFromXML(DOMElement $xml, NS|array $namespace = null): array
+    protected static function getAttributesNSFromXML(DOMElement $xml, NS|array|null $namespace = null): array
     {
         $namespace = $namespace ?? self::XS_ANY_ATTR_NAMESPACE;
         $exclusionList = self::getAttributeExclusions();

src/ExtendableElementTrait.php

@@ -42,7 +42,7 @@ trait ExtendableElementTrait
      *
      * @return list<\SimpleSAML\XML\SerializableElementInterface> $elements
      */
-    protected static function getChildElementsFromXML(DOMElement $xml, NS|array $namespace = null): array
+    protected static function getChildElementsFromXML(DOMElement $xml, NS|array|null $namespace = null): array
     {
         $namespace = $namespace ?? self::XS_ANY_ELT_NAMESPACE;
         $exclusionList = self::getElementExclusions();

src/LocalizedStringElementTrait.php

@@ -90,7 +90,7 @@ public static function fromXML(DOMElement $xml): static
      * @param \DOMElement|null $parent
      * @return \DOMElement
      */
-    final public function toXML(DOMElement $parent = null): DOMElement
+    final public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = $this->instantiateParentElement($parent);
         $e->setAttributeNS(C::NS_XML, 'xml:lang', $this->getLanguage());

src/QNameElementTrait.php

@@ -111,7 +111,7 @@ public static function fromXML(DOMElement $xml): static
      * @param \DOMElement|null $parent The element we should append this element to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = $this->instantiateParentElement($parent);
 
@@ -140,5 +140,5 @@ abstract public static function getLocalName(): string;
      * @param \DOMElement|null $parent The element we should append to.
      * @return \DOMElement
      */
-    abstract public function instantiateParentElement(DOMElement $parent = null): DOMElement;
+    abstract public function instantiateParentElement(?DOMElement $parent = null): DOMElement;
 }

src/SerializableElementInterface.php

@@ -44,5 +44,5 @@ public static function fromXML(DOMElement $xml): static;
      * @param \DOMElement|null $parent
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement;
+    public function toXML(?DOMElement $parent = null): DOMElement;
 }

src/SerializableElementTrait.php

@@ -86,5 +86,5 @@ public function __unserialize(array $serialized): void
      * @param \DOMElement|null $parent
      * @return \DOMElement
      */
-    abstract public function toXML(DOMElement $parent = null): DOMElement;
+    abstract public function toXML(?DOMElement $parent = null): DOMElement;
 }