A PHP framework for building advanced search forms in WordPress
ANNOUNCEMENT (3/27/2015): Version 1.4 is now in beta. Features include: support for searching ranges of custom field values, multiple inputs for meta_key and taxonomy fields, enhanced debugging tools, and more.
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Create a new directory "wp-advanced-search" within your theme folder.
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Add the following to your theme's functions.php file:
require_once('wp-advanced-search/wpas.php');
See the included demo template under /demo/wp-advanced-search-demo.php for an example of how to create your own forms.