D14216.diff
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	diff --git a/src/object/Phobject.php b/src/object/Phobject.php
	--- a/src/object/Phobject.php
	+++ b/src/object/Phobject.php
	@@ -60,4 +60,45 @@
	get_class($this)));
	}

	+
	+ /**
	+ * Read the value of a class constant.
	+ *
	+ * This is the same as just typing `self::CONSTANTNAME`, but throws a more
	+ * useful message if the constant is not defined and allows the constant to
	+ * be limited to a maximum length.
	+ *
	+ * @param string Name of the constant.
	+ * @param int\|null Maximum number of bytes permitted in the value.
	+ * @return string Value of the constant.
	+ */
	+ public function getPhobjectClassConstant($key, $byte_limit = null) {
	+ $class = new ReflectionClass($this);
	+
	+ $const = $class->getConstant($key);
	+ if ($const === false) {
	+ throw new Exception(
	+ pht(
	+ '"%s" class "%s" must define a "%s" constant.',
	+ __CLASS__,
	+ get_class($this),
	+ $key));
	+ }
	+
	+ if ($byte_limit !== null) {
	+ if (!is_string($const) \|\| (strlen($const) > $byte_limit)) {
	+ throw new Exception(
	+ pht(
	+ '"%s" class "%s" has an invalid "%s" property. Field constants '.
	+ 'must be strings and no more than %s bytes in length.',
	+ __CLASS__,
	+ get_class($this),
	+ $key,
	+ new PhutilNumber($byte_limit)));
	+ }
	+ }
	+
	+ return $const;
	+ }
	+
	}