diff --git a/phpcs-rulesets/plugin-check.ruleset.xml b/phpcs-rulesets/plugin-check.ruleset.xml
index b8432c1bf..2aa253d8b 100644
--- a/phpcs-rulesets/plugin-check.ruleset.xml
+++ b/phpcs-rulesets/plugin-check.ruleset.xml
@@ -87,6 +87,7 @@
 		<exclude name="WordPress.WP.AlternativeFunctions.json_encode_json_encode"/>
 		<exclude name="WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents"/>
 		<exclude name="WordPress.WP.AlternativeFunctions.file_system_operations_file_put_contents"/>
+		<exclude name="WordPress.WP.AlternativeFunctions.file_system_operations_fclose"/>
 	</rule>
 
 	<rule ref="Generic.PHP.ForbiddenFunctions">
diff --git a/test-fixtures-for-manual-testing/fclose-php-output-test.php b/test-fixtures-for-manual-testing/fclose-php-output-test.php
new file mode 100644
index 000000000..ec11628ca
--- /dev/null
+++ b/test-fixtures-for-manual-testing/fclose-php-output-test.php
@@ -0,0 +1,31 @@
+<?php
+/**
+ * Plugin Name:       Fclose PHP Output Test
+ * Description:       A test plugin to verify the Plugin Check plugin's fclose() false positive fix — fclose(php://output) should not trigger an AlternativeFunctions sniff.
+ * Version:           1.0.0
+ * Requires PHP:      7.4
+ * Author:            Plugin Check QA
+ * Text Domain:       fclose-php-output-test
+ */
+
+// This fclose() call on php://output is a common WordPress pattern
+// used to end output buffering. It should NOT trigger the
+// WordPress.WP.AlternativeFunctions.file_system_operations_fclose sniff
+// because php://output is not a file system resource.
+function send_csv_download() {
+	$handle = fopen( 'php://output', 'w' );
+	fwrite( $handle, 'name,email' . PHP_EOL );
+	fwrite( $handle, 'John,john@example.com' . PHP_EOL );
+	fclose( $handle );
+}
+
+// This fclose() on a real file SHOULD still trigger the sniff.
+function read_log_file() {
+	$handle = fopen( WP_CONTENT_DIR . '/debug.log', 'r' );
+	if ( $handle ) {
+		$contents = fread( $handle, 1024 );
+		fclose( $handle );
+		return $contents;
+	}
+	return '';
+}
diff --git a/tests/phpunit/testdata/plugins/test-plugin-review-phpcs-errors/load.php b/tests/phpunit/testdata/plugins/test-plugin-review-phpcs-errors/load.php
index bbc8501b8..415a9f36d 100644
--- a/tests/phpunit/testdata/plugins/test-plugin-review-phpcs-errors/load.php
+++ b/tests/phpunit/testdata/plugins/test-plugin-review-phpcs-errors/load.php
@@ -37,6 +37,7 @@
 
 file_get_contents( $url );
 file_put_contents();
+fclose();
 
 load_plugin_textdomain( 'sample-textdomain', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' );
 
diff --git a/tests/phpunit/tests/Checker/Checks/Plugin_Review_PHPCS_Check_Tests.php b/tests/phpunit/tests/Checker/Checks/Plugin_Review_PHPCS_Check_Tests.php
index 0e0779dba..a12633e0c 100644
--- a/tests/phpunit/tests/Checker/Checks/Plugin_Review_PHPCS_Check_Tests.php
+++ b/tests/phpunit/tests/Checker/Checks/Plugin_Review_PHPCS_Check_Tests.php
@@ -60,27 +60,30 @@ public function test_run_with_errors() {
 		// There should not be WordPress.WP.AlternativeFunctions.file_system_operations_file_put_contents error on Line no 39 and column no 1.
 		$this->assertCount( 0, wp_list_filter( $errors['load.php'][39][1], array( 'code' => 'WordPress.WP.AlternativeFunctions.file_system_operations_file_put_contents' ) ) );
 
+		// There should not be WordPress.WP.AlternativeFunctions.file_system_operations_fclose error on Line no 40 and column no 1.
+		$this->assertCount( 0, wp_list_filter( $errors['load.php'][40][1], array( 'code' => 'WordPress.WP.AlternativeFunctions.file_system_operations_fclose' ) ) );
+
 		// Check for existing forbidden functions.
 		$forbidden_found = 'Generic.PHP.ForbiddenFunctions.Found';
 
-		// Check for Generic.PHP.ForbiddenFunctions.create_functionFound error on Line no 44 and column no at 1.
-		$this->assertSame( $forbidden_found, $errors['load.php'][44][1][0]['code'] );
-
-		// Check for Generic.PHP.ForbiddenFunctions.evalFound error on Line no 45 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions.create_functionFound error on Line no 45 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][45][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions.move_uploaded_fileFound error on Line no 46 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions.evalFound error on Line no 46 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][46][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions.passthruFound error on Line no 47 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions.move_uploaded_fileFound error on Line no 47 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][47][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions.proc_openFound error on Line no 48 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions.passthruFound error on Line no 48 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][48][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions.str_rot13Found error on Line no 49 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions.proc_openFound error on Line no 49 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][49][1][0]['code'] );
 
+		// Check for Generic.PHP.ForbiddenFunctions.str_rot13Found error on Line no 50 and column no at 1.
+		$this->assertSame( $forbidden_found, $errors['load.php'][50][1][0]['code'] );
+
 		// Check for WordPress.Security.ValidatedSanitizedInput warnings on Line no 15 and column no at 27.
 		$this->assertCount( 1, wp_list_filter( $warnings['load.php'][15][27], array( 'code' => 'WordPress.Security.ValidatedSanitizedInput.InputNotValidated' ) ) );
 		$this->assertCount( 1, wp_list_filter( $warnings['load.php'][15][27], array( 'code' => 'WordPress.Security.ValidatedSanitizedInput.MissingUnslash' ) ) );
@@ -110,40 +113,40 @@ public function test_run_with_errors() {
 		// Check for WordPress.WP.DiscouragedFunctions.wp_reset_query_wp_reset_query warning on Line no 26 and column no at 1.
 		$this->assertSame( 'WordPress.WP.DiscouragedFunctions.wp_reset_query_wp_reset_query', $warnings['load.php'][26][1][0]['code'] );
 
-		// Check for PluginCheck.CodeAnalysis.DiscouragedFunctions.load_plugin_textdomainFound warning on Line no 41 and column no at 1.
-		$this->assertSame( 'PluginCheck.CodeAnalysis.DiscouragedFunctions.load_plugin_textdomainFound', $warnings['load.php'][41][1][0]['code'] );
+		// Check for PluginCheck.CodeAnalysis.DiscouragedFunctions.load_plugin_textdomainFound warning on Line no 42 and column no at 1.
+		$this->assertSame( 'PluginCheck.CodeAnalysis.DiscouragedFunctions.load_plugin_textdomainFound', $warnings['load.php'][42][1][0]['code'] );
 
 		// Check for new forbidden functions
-		// Check for Generic.PHP.ForbiddenFunctions._cleanup_header_commentFound error on Line no 52 and column no at 1.
-		$this->assertSame( $forbidden_found, $errors['load.php'][52][1][0]['code'] );
-
-		// Check for Generic.PHP.ForbiddenFunctions._get_plugin_data_markup_translateFound error on Line no 53 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions._cleanup_header_commentFound error on Line no 53 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][53][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions._transition_post_statusFound error on Line no 54 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions._get_plugin_data_markup_translateFound error on Line no 54 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][54][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions._wp_post_revision_fieldsFound error on Line no 55 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions._transition_post_statusFound error on Line no 55 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][55][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions.do_shortcode_tagFound error on Line no 56 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions._wp_post_revision_fieldsFound error on Line no 56 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][56][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions.get_post_type_labelsFound error on Line no 57 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions.do_shortcode_tagFound error on Line no 57 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][57][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions.wp_get_sidebars_widgetsFound error on Line no 58 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions.get_post_type_labelsFound error on Line no 58 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][58][1][0]['code'] );
 
-		// Check for Generic.PHP.ForbiddenFunctions.wp_get_widget_defaultsFound error on Line no 59 and column no at 1.
+		// Check for Generic.PHP.ForbiddenFunctions.wp_get_sidebars_widgetsFound error on Line no 60 and column no at 1.
 		$this->assertSame( $forbidden_found, $errors['load.php'][59][1][0]['code'] );
 
-		// Check for PluginCheck.CodeAnalysis.ShortURL.Found warning on Line no 69 and column no at 14.
-		$this->assertArrayHasKey( 69, $warnings['load.php'] );
-		$this->assertArrayHasKey( 14, $warnings['load.php'][69] );
-		$this->assertArrayHasKey( 'code', $warnings['load.php'][69][14][0] );
-		$this->assertEquals( 'PluginCheck.CodeAnalysis.ShortURL.Found', $warnings['load.php'][69][14][0]['code'] );
-		$this->assertSame( 6, $warnings['load.php'][69][14][0]['severity'] );
+		// Check for Generic.PHP.ForbiddenFunctions.wp_get_widget_defaultsFound error on Line no 60 and column no at 1.
+		$this->assertSame( $forbidden_found, $errors['load.php'][60][1][0]['code'] );
+
+		// Check for PluginCheck.CodeAnalysis.ShortURL.Found warning on Line no 70 and column no at 14.
+		$this->assertArrayHasKey( 70, $warnings['load.php'] );
+		$this->assertArrayHasKey( 14, $warnings['load.php'][70] );
+		$this->assertArrayHasKey( 'code', $warnings['load.php'][70][14][0] );
+		$this->assertEquals( 'PluginCheck.CodeAnalysis.ShortURL.Found', $warnings['load.php'][70][14][0]['code'] );
+		$this->assertSame( 6, $warnings['load.php'][70][14][0]['severity'] );
 	}
 
 	public function test_run_without_errors() {