From cde68f9336187c29ef6d1694b66dd22073baf45e Mon Sep 17 00:00:00 2001
From: markjaquith <markjaquith@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
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: http://svn.automattic.com/wordpress/trunk@4695 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-settings.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wp-settings.php b/wp-settings.php
index a22273905..f86ae86e7 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';