February 11, 2011 
Definition:
function dead_db() {}
Load custom DB error or display WordPress DB error.
If a file exists in the wp-content directory named db-error.php, then it will be loaded instead of displaying the WordPress DB error. If it is not found, then the WordPress DB error will be displayed instead.
Source code
function dead_db() {
global $wpdb;
// Load custom DB error template, if present.
if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) {
require_once( WP_CONTENT_DIR . '/db-error.php' );
die();
}
// If installing or in the admin, provide the verbose message.
if ( defined('WP_INSTALLING') || defined('WP_ADMIN') )
wp_die($wpdb->error);
// Otherwise, be terse.
status_header( 500 );
nocache_headers();
header( 'Content-Type: text/html; charset=utf-8' );
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" <?php if ( function_exists( 'language_attributes' ) ) language_attributes(); ?>>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title><?php echo /*WP_I18N_DB_ERROR*/'Database Error'/*/WP_I18N_DB_ERROR*/; ?></title>
</head>
<body>
<h1><?php echo /*WP_I18N_DB_CONNECTION_ERROR*/'Error establishing a database connection'/*/WP_I18N_DB_CONNECTION_ERROR*/; ?></h1>
</body>
</html>
<?php
die();
}
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