Explicit nullable type

.github/workflows/php.yml

@@ -50,7 +50,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           # Should be the higest supported version, so we can use the newest tools
-          php-version: '8.3'
+          php-version: '8.4'
           tools: composer, composer-require-checker, composer-unused, phpcs
           extensions: ctype, date, dom, filter, pcre, soap, spl, xml
           coverage: none
@@ -142,7 +142,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: [ubuntu-latest]
-        php-versions: ['8.1', '8.2', '8.3']
+        php-versions: ['8.1', '8.2', '8.3', '8.4']
 
     steps:
       - name: Setup PHP, with composer and extensions
@@ -182,15 +182,15 @@ jobs:
         run: composer install --no-progress --prefer-dist --optimize-autoloader
 
       - name: Run unit tests with coverage
-        if: ${{ matrix.php-versions == '8.3' }}
+        if: ${{ matrix.php-versions == '8.4' }}
         run: vendor/bin/phpunit
 
       - name: Run unit tests (no coverage)
-        if: ${{ matrix.php-versions != '8.3' }}
+        if: ${{ matrix.php-versions != '8.4' }}
         run: vendor/bin/phpunit --no-coverage
 
       - name: Save coverage data
-        if: ${{ matrix.php-versions == '8.3' }}
+        if: ${{ matrix.php-versions == '8.4' }}
         uses: actions/upload-artifact@v4
         with:
           name: coverage-data
@@ -204,7 +204,7 @@ jobs:
       fail-fast: true
       matrix:
         operating-system: [windows-latest]
-        php-versions: ['8.1', '8.2', '8.3']
+        php-versions: ['8.1', '8.2', '8.3', '8.4']
 
     steps:
       - name: Setup PHP, with composer and extensions

src/XML/auth/AbstractAdditionalContextType.php

@@ -88,7 +88,7 @@ public static function fromXML(DOMElement $xml): static
      * @param \DOMElement $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = $this->instantiateParentElement($parent);
 

src/XML/auth/AbstractClaimType.php

@@ -216,7 +216,7 @@ public static function fromXML(DOMElement $xml): static
      * @param \DOMElement $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = $this->instantiateParentElement($parent);
 

src/XML/auth/AbstractConstrainedManyValueType.php

@@ -96,7 +96,7 @@ 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);
 

src/XML/auth/AbstractConstrainedSingleValueType.php

@@ -102,7 +102,7 @@ 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);
 

src/XML/auth/AbstractConstrainedValueType.php

@@ -127,7 +127,7 @@ public static function fromXML(DOMElement $xml): static
      * @param \DOMElement $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = $this->instantiateParentElement($parent);
 

src/XML/auth/AbstractContextItemType.php

@@ -132,7 +132,7 @@ public static function fromXML(DOMElement $xml): static
      * @param \DOMElement $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = $this->instantiateParentElement($parent);
 

src/XML/auth/AbstractDescriptionType.php

@@ -62,7 +62,7 @@ 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);
         $e->textContent = $this->getContent();

src/XML/auth/AbstractDisplayNameType.php

@@ -62,7 +62,7 @@ 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);
         $e->textContent = $this->getContent();

src/XML/auth/AbstractDisplayValueType.php

@@ -62,7 +62,7 @@ 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);
         $e->textContent = $this->getContent();

src/XML/auth/AbstractEncryptedValueType.php

@@ -88,7 +88,7 @@ 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);
         $e->setAttribute('DescriptionCondition', $this->getDescriptionCondition());

src/XML/auth/AbstractStructuredValueType.php

@@ -73,7 +73,7 @@ public static function fromXML(DOMElement $xml): static
      * @param \DOMElement $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/auth/AbstractValueInRangeType.php

@@ -79,10 +79,10 @@ public function getValueLowerBound(): ValueLowerBound
     /**
      * Add this ValueInRangeType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this username token to.
+     * @param \DOMElement|null $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractAssertionType.php

@@ -79,10 +79,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this AssertionType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this AssertionType to.
+     * @param \DOMElement|null $parent The element we should append this AssertionType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractAttributeExtensibleString.php

@@ -60,7 +60,7 @@ 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
     {
         $e = $this->instantiateParentElement($parent);
         $e->textContent = $this->getContent();

src/XML/fed/AbstractAttributeExtensibleURI.php

@@ -60,7 +60,7 @@ 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
     {
         $e = $this->instantiateParentElement($parent);
         $e->textContent = $this->getContent();

src/XML/fed/AbstractClaimDialectType.php

@@ -84,10 +84,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this ClaimDialectType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this username token to.
+     * @param \DOMElement|null $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractClaimDialectsOfferedType.php

@@ -84,10 +84,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this ClaimDialectsOfferedType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this ClaimDialectsOfferedType to.
+     * @param \DOMElement|null $parent The element we should append this ClaimDialectsOfferedType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractClaimTypesOfferedType.php

@@ -83,10 +83,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this ClaimTypesOfferedType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this ClaimTypesOfferedType to.
+     * @param \DOMElement|null $parent The element we should append this ClaimTypesOfferedType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractClaimTypesRequestedType.php

@@ -83,10 +83,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this ClaimTypesRequestedType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this ClaimTypesRequestedType to.
+     * @param \DOMElement|null $parent The element we should append this ClaimTypesRequestedType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractClientPseudonymType.php

@@ -130,10 +130,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this ClientPseudonymType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this FederationMetadataType to.
+     * @param \DOMElement|null $parent The element we should append this FederationMetadataType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractEndpointType.php

@@ -65,7 +65,7 @@ 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);
 

src/XML/fed/AbstractFederationMetadataHandlerType.php

@@ -69,10 +69,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this FederationMetadataHandlerType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this FederationMetadataHandlerType to.
+     * @param \DOMElement|null $parent The element we should append this FederationMetadataHandlerType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractFederationMetadataType.php

@@ -79,10 +79,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this FederationMetadataType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this FederationMetadataType to.
+     * @param \DOMElement|null $parent The element we should append this FederationMetadataType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractFederationType.php

@@ -95,10 +95,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this FederationType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this FederationType to.
+     * @param \DOMElement|null $parent The element we should append this FederationType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractFilterPseudonymsType.php

@@ -116,10 +116,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this FilterPseudonymsType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this username token to.
+     * @param \DOMElement|null $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractFreshnessType.php

@@ -104,10 +104,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this IssuerNameType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this issuer name to.
+     * @param \DOMElement|null $parent The element we should append this issuer name to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
         $e->textContent = $this->getContent();

src/XML/fed/AbstractIssuerNameType.php

@@ -73,10 +73,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this IssuerNameType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this issuer name to.
+     * @param \DOMElement|null $parent The element we should append this issuer name to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
         $e->setAttribute('Uri', $this->getUri());

src/XML/fed/AbstractLogicalServiceNamesOfferedType.php

@@ -84,10 +84,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this LogicalServiceNamesOfferedType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this LogicalServiceNamesOfferedType to.
+     * @param \DOMElement|null $parent The element we should append this LogicalServiceNamesOfferedType to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractProofTokenType.php

@@ -73,10 +73,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this AbstractProofTokenType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this username token to.
+     * @param \DOMElement|null $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractPseudonymBasisType.php

@@ -76,10 +76,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this AbstractPseudonymBasisType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this username token to.
+     * @param \DOMElement|null $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);
 

src/XML/fed/AbstractPseudonymType.php

@@ -110,10 +110,10 @@ public static function fromXML(DOMElement $xml): static
     /**
      * Add this PseudonymType to an XML element.
      *
-     * @param \DOMElement $parent The element we should append this username token to.
+     * @param \DOMElement|null $parent The element we should append this username token to.
      * @return \DOMElement
      */
-    public function toXML(DOMElement $parent = null): DOMElement
+    public function toXML(?DOMElement $parent = null): DOMElement
     {
         $e = parent::instantiateParentElement($parent);