From 96ed39c9e5d0ccc998c078c41c2509de8b8bdc4b Mon Sep 17 00:00:00 2001
From: Shish <shish@shishnet.org>
Date: Mon, 5 Nov 2018 17:45:19 +0000
Subject: [PATCH] Check for mb_strlen during install (see #615)

---
 install.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/install.php b/install.php
index 8584a9ac..ee928668 100644
--- a/install.php
+++ b/install.php
@@ -172,7 +172,7 @@ function ask_questions() { // {{{
 	if(check_gd_version() == 0 && check_im_version() == 0) {
 		$errors[] = "
 			No thumbnailers could be found - install the imagemagick
-			tools (or the PHP-GD library, of imagemagick is unavailable).
+			tools (or the PHP-GD library, if imagemagick is unavailable).
 		";
 	}
 	else if(check_im_version() == 0) {
@@ -183,6 +183,13 @@ function ask_questions() { // {{{
 		";
 	}
 
+	if(!function_exists('mb_strlen')) {
+		$errors[] = "
+			The mbstring PHP extension is missing - multibyte languages
+			(eg non-english languages) may not work right.
+		";
+	}
+
 	$drivers = PDO::getAvailableDrivers();
 	if(
 		!in_array("mysql", $drivers) &&