diff --git a/inc/functions.php b/inc/functions.php
index b81d9e3..bec65de 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -3,6 +3,14 @@ if (!defined('TINYIB_BOARD')) {
 	die('');
 }
 
+if (!function_exists('array_column')) {
+	function array_column($array, $column_name) {
+		return array_map(function ($element) use ($column_name) {
+			return $element[$column_name];
+		}, $array);
+	}
+}
+
 if (TINYIB_DBMODE == 'pdo' && TINYIB_DBDRIVER == 'pgsql') {
 	$posts_sql = 'CREATE TABLE "' . TINYIB_DBPOSTS . '" (
 		"id" bigserial NOT NULL,