WordPress · Soean · Sep 14, 2026
diff --git a/tests/phpstan/HookDocBlock.php b/tests/phpstan/HookDocBlock.php
@@ -216,9 +216,7 @@ public function getReferencedHookDocsHash(): string {
 				// depend on where the checkout lives.
 				$key = $this->getRootRelativePath( $target );
 
-				if ( ! isset( $docs[ $key ] ) ) {
-					$docs[ $key ] = $this->getHookDocs( $target );
-				}
+				$docs[ $key ] ??= $this->getHookDocs( $target );
 			}
 		}
 
@@ -562,9 +560,7 @@ private function findHookDoc( string $file, array $matcher ): ?string {
 	 * @return HookDocs
 	 */
 	private function getHookDocs( string $file ): array {
-		if ( ! isset( $this->fileHookDocs[ $file ] ) ) {
-			$this->fileHookDocs[ $file ] = self::loadHookDocs( $file );
-		}
+		$this->fileHookDocs[ $file ] ??= self::loadHookDocs( $file );
 
 		return $this->fileHookDocs[ $file ];
 	}
@@ -663,9 +659,7 @@ private static function parseHookDocs( string $code ): array {
 			$name_expr = $args[0]->value;
 
 			if ( $name_expr instanceof String_ ) {
-				if ( ! isset( $docs['exact'][ $name_expr->value ] ) ) {
-					$docs['exact'][ $name_expr->value ] = $doc->getText();
-				}
+				$docs['exact'][ $name_expr->value ] ??= $doc->getText();
 				continue;
 			}
 

diff --git a/tests/phpunit/includes/abstract-testcase.php b/tests/phpunit/includes/abstract-testcase.php
@@ -1406,9 +1406,7 @@ public function go_to( $url ) {
 		} else {
 			$req = $url;
 		}
-		if ( ! isset( $parts['query'] ) ) {
-			$parts['query'] = '';
-		}
+		$parts['query'] ??= '';
 
 		$_SERVER['REQUEST_URI'] = $req;
 		unset( $_SERVER['PATH_INFO'] );

diff --git a/tests/phpunit/includes/class-wp-phpunit-timing-metrics.php b/tests/phpunit/includes/class-wp-phpunit-timing-metrics.php
@@ -100,9 +100,7 @@ public static function from_file( $file, $testcase_callback = null ) {
 			throw new RuntimeException( 'The JUnit timing report contains no testcases.' );
 		}
 
-		if ( null === $suite_time ) {
-			$suite_time = array_sum( $test_times );
-		}
+		$suite_time ??= array_sum( $test_times );
 
 		sort( $test_times, SORT_NUMERIC );
 

diff --git a/tests/phpunit/includes/class-wp-test-stream.php b/tests/phpunit/includes/class-wp-test-stream.php
@@ -60,9 +60,7 @@ private function open( $url ) {
 			throw new Exception( 'Cannot use an empty bucket name' );
 		}
 
-		if ( ! isset( WP_Test_Stream::$data[ $this->bucket ] ) ) {
-			WP_Test_Stream::$data[ $this->bucket ] = array();
-		}
+		WP_Test_Stream::$data[ $this->bucket ] ??= array();
 
 		$this->data_ref =& WP_Test_Stream::$data[ $this->bucket ][ $this->file ];
 
@@ -101,9 +99,7 @@ public function stream_read( $count ) {
 	 * @see streamWrapper::stream_write
 	 */
 	public function stream_write( $data ) {
-		if ( ! isset( $this->data_ref ) ) {
-			$this->data_ref = '';
-		}
+		$this->data_ref ??= '';
 
 		$left  = substr( $this->data_ref, 0, $this->position );
 		$right = substr( $this->data_ref, $this->position + strlen( $data ) );
@@ -186,9 +182,7 @@ public function stream_eof() {
 	public function stream_metadata( $path, $option, $value ) {
 		$this->open( $path );
 		if ( STREAM_META_TOUCH === $option ) {
-			if ( ! isset( $this->data_ref ) ) {
-				$this->data_ref = '';
-			}
+			$this->data_ref ??= '';
 			return true;
 		}
 		return false;

diff --git a/tests/phpunit/includes/factory/class-wp-unittest-factory-for-thing.php b/tests/phpunit/includes/factory/class-wp-unittest-factory-for-thing.php
@@ -62,9 +62,7 @@ abstract public function update_object( $object_id, $fields );
 	 * @return int|WP_Error The object ID on success, WP_Error object on failure.
 	 */
 	public function create( $args = array(), $generation_definitions = null ) {
-		if ( is_null( $generation_definitions ) ) {
-			$generation_definitions = $this->default_generation_definitions;
-		}
+		$generation_definitions ??= $this->default_generation_definitions;
 
 		$generated_args = $this->generate_args( $args, $generation_definitions, $callbacks );
 		$object_id      = $this->create_object( $generated_args );
@@ -155,10 +153,8 @@ public function create_many( $count, $args = array(), $generation_definitions =
 	 * @return array|WP_Error Combined array on success. WP_Error when default value is incorrect.
 	 */
 	public function generate_args( $args = array(), $generation_definitions = null, &$callbacks = null ) {
-		$callbacks = array();
-		if ( is_null( $generation_definitions ) ) {
-			$generation_definitions = $this->default_generation_definitions;
-		}
+		$callbacks                = array();
+		$generation_definitions ??= $this->default_generation_definitions;
 
 		// Use the same incrementor for all fields belonging to this object.
 		$gen = new WP_UnitTest_Generator_Sequence();

diff --git a/tests/phpunit/includes/utils.php b/tests/phpunit/includes/utils.php
@@ -110,10 +110,8 @@ public function current_filter() {
 		if ( is_callable( 'current_filter' ) ) {
 			$current_filter = current_filter();
 		} else {
-			$current_filter = array_key_last( $wp_actions );
-			if ( null === $current_filter ) {
-				$current_filter = false;
-			}
+			$current_filter   = array_key_last( $wp_actions );
+			$current_filter ??= false;
 		}
 
 		return $current_filter;
@@ -393,10 +391,8 @@ public function start_handler( $parser, $name, $attributes ) {
 	public function data_handler( $parser, $data ) {
 		$index = count( $this->data ) - 1;
 
-		if ( ! isset( $this->data[ $index ]['content'] ) ) {
-			$this->data[ $index ]['content'] = '';
-		}
-		$this->data[ $index ]['content'] .= $data;
+		$this->data[ $index ]['content'] ??= '';
+		$this->data[ $index ]['content']  .= $data;
 	}
 
 	public function end_handler( $parser, $name ) {

diff --git a/tests/phpunit/tests/admin/plugin-dependencies/base.php b/tests/phpunit/tests/admin/plugin-dependencies/base.php
@@ -92,9 +92,7 @@ private function reset_static_properties() {
 	 * @param mixed  $value The new value.
 	 */
 	public function set_property_value( $property, $value ) {
-		if ( ! isset( self::$reflected_members[ $property ] ) ) {
-			self::$reflected_members[ $property ] = new ReflectionProperty( self::$instance, $property );
-		}
+		self::$reflected_members[ $property ] ??= new ReflectionProperty( self::$instance, $property );
 
 		if ( PHP_VERSION_ID < 80100 ) {
 			self::$reflected_members[ $property ]->setAccessible( true );
@@ -112,9 +110,7 @@ public function set_property_value( $property, $value ) {
 	 * @return mixed The value of the property.
 	 */
 	public function get_property_value( $property ) {
-		if ( ! isset( self::$reflected_members[ $property ] ) ) {
-			self::$reflected_members[ $property ] = new ReflectionProperty( self::$instance, $property );
-		}
+		self::$reflected_members[ $property ] ??= new ReflectionProperty( self::$instance, $property );
 
 		if ( PHP_VERSION_ID < 80100 ) {
 			self::$reflected_members[ $property ]->setAccessible( true );
@@ -136,9 +132,7 @@ public function get_property_value( $property ) {
 	 * @return mixed The result of the method call.
 	 */
 	protected function call_method( $method, ...$args ) {
-		if ( ! isset( self::$reflected_members[ $method ] ) ) {
-			self::$reflected_members[ $method ] = new ReflectionMethod( self::$instance, $method );
-		}
+		self::$reflected_members[ $method ] ??= new ReflectionMethod( self::$instance, $method );
 
 		if ( PHP_VERSION_ID < 80100 ) {
 			self::$reflected_members[ $method ]->setAccessible( true );

diff --git a/tests/phpunit/tests/blocks/register.php b/tests/phpunit/tests/blocks/register.php
@@ -721,13 +721,9 @@ public function test_register_block_style_handle_uses_correct_core_stylesheet( $
 		$block_name = str_replace( 'core/', '', $metadata['name'] );
 
 		// Normalize metadata similar to `register_block_type_from_metadata()`.
-		$metadata['file'] = wp_normalize_path( realpath( $metadata_file ) );
-		if ( ! isset( $metadata['style'] ) ) {
-			$metadata['style'] = "wp-block-$block_name";
-		}
-		if ( ! isset( $metadata['editorStyle'] ) ) {
-			$metadata['editorStyle'] = "wp-block-{$block_name}-editor";
-		}
+		$metadata['file']          = wp_normalize_path( realpath( $metadata_file ) );
+		$metadata['style']       ??= "wp-block-$block_name";
+		$metadata['editorStyle'] ??= "wp-block-{$block_name}-editor";
 
 		// Ensure block assets are separately registered.
 		add_filter( 'should_load_separate_core_block_assets', '__return_true' );

diff --git a/tests/phpunit/tests/blocks/registerCoreBlockStyleHandles.php b/tests/phpunit/tests/blocks/registerCoreBlockStyleHandles.php
@@ -181,12 +181,8 @@ private function get_block_data() {
 
 		$data = array();
 		foreach ( $core_blocks_meta as $name => $schema ) {
-			if ( ! isset( $schema['style'] ) ) {
-				$schema['style'] = "wp-block-$name";
-			}
-			if ( ! isset( $schema['editorStyle'] ) ) {
-				$schema['editorStyle'] = "wp-block-{$name}-editor";
-			}
+			$schema['style']       ??= "wp-block-$name";
+			$schema['editorStyle'] ??= "wp-block-{$name}-editor";
 
 			$data[ $name ] = $schema;
 		}

diff --git a/tests/phpunit/tests/fonts/font-face/wp-font-face-tests-dataset.php b/tests/phpunit/tests/fonts/font-face/wp-font-face-tests-dataset.php
@@ -386,12 +386,10 @@ public static function get_custom_font_families( $key = '' ) {
 			),
 		);
 
-		if ( null === $data ) {
-			$data = array(
-				'input'    => $custom_theme_json_fonts,
-				'expected' => $expected_font_faces,
-			);
-		}
+		$data ??= array(
+			'input'    => $custom_theme_json_fonts,
+			'expected' => $expected_font_faces,
+		);
 
 		return $data[ $key ] ?? $data;
 	}
@@ -473,12 +471,10 @@ public static function get_custom_style_variations( $key = '' ) {
 @font-face{font-family:"DM Sans";font-style:italic;font-weight:500;font-display:fallback;src:url('{$uri}dm-sans/DMSans-Medium-Italic.woff2') format('woff2');font-stretch:normal;}
 CSS;
 
-		if ( null === $data ) {
-			$data = array(
-				'expected'        => $expected_font_families,
-				'expected_styles' => $expected_styles,
-			);
-		}
+		$data ??= array(
+			'expected'        => $expected_font_families,
+			'expected_styles' => $expected_styles,
+		);
 
 		return $data[ $key ] ?? $data;
 	}

diff --git a/tests/phpunit/tests/rest-api/rest-schema-validation.php b/tests/phpunit/tests/rest-api/rest-schema-validation.php
@@ -1697,18 +1697,14 @@ public function data_unique_items() {
 				continue;
 			}
 			// type is required for our implementation
-			if ( ! isset( $suite['schema']['type'] ) ) {
-				$suite['schema']['type'] = 'array';
-			}
+			$suite['schema']['type'] ??= 'array';
 			// items is required for our implementation
-			if ( ! isset( $suite['schema']['items'] ) ) {
-				$suite['schema']['items'] = array(
-					'type'  => $all_types,
-					'items' => array(
-						'type' => $all_types,
-					),
-				);
-			}
+			$suite['schema']['items'] ??= array(
+				'type'  => $all_types,
+				'items' => array(
+					'type' => $all_types,
+				),
+			);
 			foreach ( $suite['tests'] as $test ) {
 				$tests[] = array( $test, $suite );
 			}

diff --git a/tests/phpunit/tests/url.php b/tests/phpunit/tests/url.php
@@ -364,11 +364,9 @@ public function test_get_adjacent_post() {
 		$post_id  = self::factory()->post->create( array( 'post_date' => gmdate( 'Y-m-d H:i:s', $now - 1 ) ) );
 		$post_id2 = self::factory()->post->create( array( 'post_date' => gmdate( 'Y-m-d H:i:s', $now ) ) );
 
-		if ( ! isset( $GLOBALS['post'] ) ) {
-			$GLOBALS['post'] = null;
-		}
-		$orig_post       = $GLOBALS['post'];
-		$GLOBALS['post'] = get_post( $post_id2 );
+		$GLOBALS['post'] ??= null;
+		$orig_post         = $GLOBALS['post'];
+		$GLOBALS['post']   = get_post( $post_id2 );
 
 		$p = get_adjacent_post();
 		$this->assertInstanceOf( 'WP_Post', $p );
@@ -416,10 +414,8 @@ public function test_get_adjacent_post_should_return_private_posts_belonging_to_
 			)
 		);
 
-		if ( ! isset( $GLOBALS['post'] ) ) {
-			$GLOBALS['post'] = null;
-		}
-		$orig_post = $GLOBALS['post'];
+		$GLOBALS['post'] ??= null;
+		$orig_post         = $GLOBALS['post'];
 
 		$GLOBALS['post'] = get_post( $p2 );
 
@@ -456,10 +452,8 @@ public function test_get_adjacent_post_should_return_private_posts_belonging_to_
 			)
 		);
 
-		if ( ! isset( $GLOBALS['post'] ) ) {
-			$GLOBALS['post'] = null;
-		}
-		$orig_post = $GLOBALS['post'];
+		$GLOBALS['post'] ??= null;
+		$orig_post         = $GLOBALS['post'];
 
 		$GLOBALS['post'] = get_post( $p2 );
 
@@ -502,10 +496,8 @@ public function test_get_adjacent_post_should_not_return_private_posts_belonging
 			)
 		);
 
-		if ( ! isset( $GLOBALS['post'] ) ) {
-			$GLOBALS['post'] = null;
-		}
-		$orig_post = $GLOBALS['post'];
+		$GLOBALS['post'] ??= null;
+		$orig_post         = $GLOBALS['post'];
 
 		$GLOBALS['post'] = get_post( $p3 );
 

diff --git a/tests/phpunit/tests/wp-token-map/wpTokenMap.php b/tests/phpunit/tests/wp-token-map/wpTokenMap.php
@@ -383,9 +383,7 @@ private function get_html5_test_dataset() {
 	private static function get_html5_token_map() {
 		static $html5_token_map = null;
 
-		if ( ! isset( $html5_token_map ) ) {
-			$html5_token_map = WP_Token_Map::from_array( self::get_test_input_array( 'HTML5' ) );
-		}
+		$html5_token_map ??= WP_Token_Map::from_array( self::get_test_input_array( 'HTML5' ) );
 
 		return $html5_token_map;
 	}