D14070.diff
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	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
	@@ -419,6 +419,7 @@
	'phutil_console_prompt' => 'console/format.php',
	'phutil_console_require_tty' => 'console/format.php',
	'phutil_console_wrap' => 'console/format.php',
	+ 'phutil_count' => 'internationalization/pht.php',
	'phutil_date_format' => 'utils/viewutils.php',
	'phutil_deprecated' => 'moduleutils/moduleutils.php',
	'phutil_error_listener_example' => 'error/phlog.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 +16,18 @@
	$translator = PhutilTranslator::getInstance();
	return call_user_func_array(array($translator, 'translate'), $args);
	}
	+
	+/**
	+ * Count all elements in an array, or something in an object.
	+ *
	+ * @param array\|Countable A countable object.
	+ * @return PhutilNumber Returns the number of elements in the input
	+ * parameter.
	+ */
	+function phutil_count($countable) {
	+ if (!(is_array($countable) \|\| $countable instanceof Countable)) {
	+ throw new InvalidArgumentException(pht('Argument should be countable.'));
	+ }
	+
	+ return new PhutilNumber(count($countable));
	+}