reverted:
--- b/xmlrpc.module
+++ a/xmlrpc.module
@@ -5,8 +5,6 @@
  * Enables XML-RPC functionality.
  */
 
-// phpcs:disable Drupal.NamingConventions.ValidFunctionName.InvalidPrefix
-
 use Drupal\Core\Url;
 
 /**
@@ -31,9 +29,9 @@
  *
  * Usage example:
  * @code
+ * $result = xmlrpc('http://example.com/xmlrpc', array(
+ *   'service.methodName' => array($parameter, $second, $third),
+ * ));
- * $result = xmlrpc('http://example.com/xmlrpc', [
- *   'service.methodName' => [$parameter, $second, $third],
- * ]);
  * @endcode
  *
  * @param string $url
@@ -57,7 +55,6 @@
  * @ingroup third_party
  */
 function xmlrpc($url, array $args, array $headers = []) {
-// phpcs:ignore Drupal.NamingConventions.ValidFunctionName.InvalidPrefix
   module_load_include('inc', 'xmlrpc');
   return _xmlrpc($url, $args, $headers);
 }
diff -u b/xmlrpc_example/tests/src/Functional/XmlRpcExampleTest.php b/xmlrpc_example/tests/src/Functional/XmlRpcExampleTest.php
--- b/xmlrpc_example/tests/src/Functional/XmlRpcExampleTest.php
+++ b/xmlrpc_example/tests/src/Functional/XmlRpcExampleTest.php
@@ -74,18 +74,18 @@
     // Add the integers.
     $edit = ['num1' => 3, 'num2' => 5];
     $this->drupalGet('/xmlrpc_example/client');
-    $this->submitForm($edit, 'Add the integers');
-    $this->assertSession()->pageTextContains('The XML-RPC server returned this response: 8');
+    $this->submitForm($edit, $this->t('Add the integers'));
+    $this->assertSession()->pageTextContains($this->t('The XML-RPC server returned this response: @num', ['@num' => 8]));
 
     // Subtract the integers.
     $edit = ['num1' => 8, 'num2' => 3];
     $this->drupalGet('/xmlrpc_example/client');
-    $this->submitForm($edit, 'Subtract the integers');
-    $this->assertSession()->pageTextContains('The XML-RPC server returned this response: 5');
+    $this->submitForm($edit, $this->t('Subtract the integers'));
+    $this->assertSession()->pageTextContains($this->t('The XML-RPC server returned this response: @num', ['@num' => 5]));
 
     // Request available methods.
     $this->drupalGet('/xmlrpc_example/client');
-    $this->submitForm($edit, 'Request methods');
+    $this->submitForm($edit, $this->t('Request methods'));
     // Assert that the XML-RPC Add method was found.
     $this->assertSession()->pageTextContains('xmlrpc_example.add');
     // Assert that the XML-RPC Subtract method was found.
@@ -97,7 +97,7 @@
     // Verify multicall request.
     $edit = ['num1' => 5, 'num2' => 2];
     $this->drupalGet('/xmlrpc_example/client');
-    $this->submitForm($edit, 'Add and Subtract');
+    $this->submitForm($edit, $this->t('Add and Subtract'));
 
     // Assert that the XML-RPC server returned the addition result.
     $this->assertSession()->pageTextContains('[0] => 7');
@@ -113,15 +113,15 @@
     // Set different minimum and maximum values.
     $options = ['min' => 3, 'max' => 7];
     $this->drupalGet('/xmlrpc_example/server');
-    $this->submitForm($options, 'Save configuration');
+    $this->submitForm($options, $this->t('Save configuration'));
 
     // Results limited to >= 3 and <= 7.
-    $this->assertSession()->pageTextContains('The configuration options have been saved');
+    $this->assertSession()->pageTextContains($this->t('The configuration options have been saved'));
 
     $edit = ['num1' => 8, 'num2' => 3];
     $this->drupalGet('/xmlrpc_example/client');
-    $this->submitForm($edit, 'Subtract the integers');
-    $this->assertSession()->pageTextContains('The XML-RPC server returned this response: 5');
+    $this->submitForm($edit, $this->t('Subtract the integers'));
+    $this->assertSession()->pageTextContains($this->t('The XML-RPC server returned this response: @num', ['@num' => 5]));
 
     $result = xmlrpc($this->xmlRpcUrl, ['xmlrpc_example.add' => [3, 4]]);
     $this->assertEquals($result, 7, 'Successfully added 3+4 = 7');
@@ -145,16 +145,16 @@
     // Enable XML-RPC service altering functionality.
     $options = ['alter_enabled' => TRUE];
     $this->drupalGet('/xmlrpc_example/alter');
-    $this->submitForm($options, 'Save configuration');
+    $this->submitForm($options, $this->t('Save configuration'));
     // Assert that the results are not limited due to methods alteration.
-    $this->assertSession()->pageTextContains('The configuration options have been saved');
+    $this->assertSession()->pageTextContains($this->t('The configuration options have been saved'));
 
     // After altering the functionality, the add and subtract methods have no
     // limits and should not return any error.
     $edit = ['num1' => 80, 'num2' => 3];
     $this->drupalGet('/xmlrpc_example/client');
-    $this->submitForm($edit, 'Subtract the integers');
-    $this->assertSession()->pageTextContains('The XML-RPC server returned this response: 77');
+    $this->submitForm($edit, $this->t('Subtract the integers'));
+    $this->assertSession()->pageTextContains($this->t('The XML-RPC server returned this response: @num', ['@num' => 77]));
 
     $result = xmlrpc($this->xmlRpcUrl, ['xmlrpc_example.add' => [30, 4]]);
     $this->assertEquals($result, 34, 'Successfully added 30+4 = 34');