From 4a33cd168795282718c7324c7c3741ea280810d4 Mon Sep 17 00:00:00 2001
From: Mark Jaquith <markjaquith@git.wordpress.org>
Date: Sun, 7 Jan 2007 09:41:32 +0000
Subject: [PATCH] Exit gracefully with a warning if the table_prefix uses
 disallowed chars.  fixes #3537

git-svn-id: https://develop.svn.wordpress.org/trunk@4695 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-settings.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wp-settings.php b/wp-settings.php
index a22273905a..f86ae86e71 100644
--- a/wp-settings.php
+++ b/wp-settings.php
@@ -100,6 +100,9 @@ else
 // $table_prefix is deprecated as of 2.1
 $wpdb->prefix = $table_prefix;
 
+if ( preg_match('|[^a-z0-9_]|i', $wpdb->prefix) && !file_exists(ABSPATH . 'wp-content/db.php') )
+	die(__('<strong>ERROR</strong>: <code>$table_prefix</code> in <code>wp-config.php</code> can only contain numbers, letters, and underscores.'));
+
 // Table names
 $wpdb->posts          = $wpdb->prefix . 'posts';
 $wpdb->users          = $wpdb->prefix . 'users';