From 24ad06035170e51913123243f2f44ba4f76fd6f5 Mon Sep 17 00:00:00 2001
From: Pascal Birchler <pascal.birchler@gmail.com>
Date: Fri, 22 Mar 2024 14:17:09 +0000
Subject: [PATCH] Editor: Check if `mb_strtolower` exists before using it in
 the font library.

Prevents an error when uploading fonts on certain systems, because the `mbstring` extension can be missing and thus the function may not be available.

Props mujuonly, swissspidy, peterwilsoncc.
Fixes #60823.
See #55603.
Built from https://develop.svn.wordpress.org/trunk@57865


git-svn-id: http://core.svn.wordpress.org/trunk@57366 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/fonts/class-wp-font-utils.php | 7 +++++--
 wp-includes/version.php                   | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/wp-includes/fonts/class-wp-font-utils.php b/wp-includes/fonts/class-wp-font-utils.php
index 3c2d5057e4..6e91440748 100644
--- a/wp-includes/fonts/class-wp-font-utils.php
+++ b/wp-includes/fonts/class-wp-font-utils.php
@@ -110,8 +110,11 @@ class WP_Font_Utils {
 			'unicodeRange' => 'U+0-10FFFF',
 		);
 		$settings = wp_parse_args( $settings, $defaults );
-
-		$font_family   = mb_strtolower( $settings['fontFamily'] );
+		if ( function_exists( 'mb_strtolower' ) ) {
+			$font_family = mb_strtolower( $settings['fontFamily'] );
+		} else {
+			$font_family = strtolower( $settings['fontFamily'] );
+		}
 		$font_style    = strtolower( $settings['fontStyle'] );
 		$font_weight   = strtolower( $settings['fontWeight'] );
 		$font_stretch  = strtolower( $settings['fontStretch'] );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 51bb22d56d..814a3fa3e4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-57864';
+$wp_version = '6.6-alpha-57865';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.