Issue #2676100: Fully namespaced function calls are allowed

coder_sniffer/Drupal/Sniffs/Classes/FullyQualifiedNamespaceSniff.php

@@ -68,6 +68,13 @@ class Drupal_Sniffs_Classes_FullyQualifiedNamespaceSniff implements PHP_CodeSnif
             return $phpcsFile->findNext([T_STRING, T_NS_SEPARATOR], ($stackPtr + 1), null, true);
         }
 
+        // If this is a namespaced function call then ignore this because use
+        // statements for functions are not possible in PHP 5.5 and lower.
+        $after = $phpcsFile->findNext([T_STRING, T_NS_SEPARATOR, T_WHITESPACE], $stackPtr, null, true);
+        if ($tokens[$after]['code'] === T_OPEN_PARENTHESIS && $tokens[$before]['code'] !== T_NEW) {
+            return ($after + 1);
+        }
+
         $error = 'Namespaced classes/interfaces/traits should be referenced with use statements';
         $phpcsFile->addError($error, $stackPtr, 'UseStatementMissing');
 

coder_sniffer/Drupal/Test/good/good.php

@@ -1243,3 +1243,14 @@ class OperatorTest {
   }
 
 }
+
+// Namespaced function call is allowed because PHP 5.5 and lower do not support
+// use statements for functions.
+$default_config = [
+  'verify' => TRUE,
+  'timeout' => 30,
+  'headers' => [
+    'User-Agent' => 'Drupal/' . \Drupal::VERSION . ' (+https://www.drupal.org/) ' . \GuzzleHttp\default_user_agent(),
+  ],
+  'handler' => $stack,
+];