From bf945a81ec1165ae3116e9aa1ef337785d6e6b6a Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Tue, 29 Sep 2020 10:01:05 +0000
Subject: [PATCH] Code Modernization: Remove a single trailing percent sign
 before calling `sprintf()` on the `$default` parameter in `get_theme_mod()`.

This avoids a "Missing format specifier at end of string" fatal error on PHP 8, and maintains the current behaviour.

See #50913.

git-svn-id: https://develop.svn.wordpress.org/trunk@49068 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/theme.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/wp-includes/theme.php b/src/wp-includes/theme.php
index 93008dd567..5fa7a23146 100644
--- a/src/wp-includes/theme.php
+++ b/src/wp-includes/theme.php
@@ -1024,6 +1024,8 @@ function get_theme_mod( $name, $default = false ) {
 	if ( is_string( $default ) ) {
 		// Only run the replacement if an sprintf() string format pattern was found.
 		if ( preg_match( '#(?<!%)%(?:\d+\$?)?s#', $default ) ) {
+			// Remove a single trailing percent sign.
+			$default = preg_replace( '#(?<!%)%$#', '', $default );
 			$default = sprintf( $default, get_template_directory_uri(), get_stylesheet_directory_uri() );
 		}
 	}