I have blog and forum, and I need to put wordpress external logout link. What files do I need to add to make wp_logout_url(); work?
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To allow WordPress functions to operate outside of the WordPress environment, you need to let your external pages know about and have access to the WordPress Core and API environment.
The above link is one such reference which covers this very purpose.
In order to transform regular PHP pages into ones that utilize WordPress, you need to add either of the following code snippets to the start of each page.
<?php /* Short and sweet */ define('WP_USE_THEMES', false); require('./wp-blog-header.php'); ?>
<?php require('/the/path/to/your/wp-blog-header.php'); ?>
Getting your paths right is very important, without, you'll have no joy.
Refer to the link provided for even greater detail. Any problems thereafter please let us know along with what you have tried, code samples used, etc.