+/**
+ * Sorts a multidimensional array by first member of each top level member
+ *
+ * Used by uasort() as a callback, should not be used directly.
+ *
+ * @since 2.9.0
+ * @access private
+ *
+ * @param array $a
+ * @param array $b
+ * @return int
+ */
+function _usort_by_first_member( $a, $b ) {
+ return strnatcasecmp( $a[0], $b[0] );
+}
+