diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -402,6 +402,7 @@
     'newv' => 'utils/utils.php',
     'nonempty' => 'utils/utils.php',
     'phlog' => 'error/phlog.php',
+    'phnutil_count' => 'internationalization/pht.php',
     'pht' => 'internationalization/pht.php',
     'phutil_censor_credentials' => 'utils/utils.php',
     'phutil_console_confirm' => 'console/format.php',
diff --git a/src/internationalization/pht.php b/src/internationalization/pht.php
--- a/src/internationalization/pht.php
+++ b/src/internationalization/pht.php
@@ -16,3 +16,13 @@
   $translator = PhutilTranslator::getInstance();
   return call_user_func_array(array($translator, 'translate'), $args);
 }
+
+/**
+ * Count all elements in an array, or something in an object.
+ *
+ * @param  wild          An array or `Countable` object.
+ * @return PhutilNumber  Returns the number of elements in the input parameter.
+ */
+function phnutil_count($countable) {
+  return new PhutilNumber(count($countable));
+}