Test whether blog is already installed.
The cache will be checked first. If you have a cache plugin, which saves the cache values, then this will work. If you use the default WordPress cache, and the database goes away, then you might have problems.
Checks for the option siteurl for whether WordPress is installed.
<?php is_blog_installed() ?>
This tag does not accept any parameters.
Since: 2.1.0
is_blog_installed() is located in wp-includes/functions.php
.