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POVarnish ESI & Wordpress - simulate loading a post
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copied!<p><strong>Update: I've answered this myself. See below.</strong></p> <p>I guess I'm asking for the equivalent of a <code>set_the_id()</code> function, if one existed.</p> <p>I'm using Wordpress with Varnish for performance, and I want to use an ESI (Edge Side Include) for the sidebar, so things like recent/popular posts can be refreshed more frequently than the post content itself.</p> <p><a href="http://timbroder.com/2012/12/getting-started-with-varnish-edge-side-includes-and-wordpress.html" rel="nofollow">One way of doing this</a> is creating an endpoint in your plugins directory etc. for Varnish to access from an ESI comment, with some code like this:</p> <pre><code><?php /* ESI handler for Varnish - Sidebar (all tabs except search) */ $cwd = getcwd(); $path = substr($cwd, 0, strpos($cwd, 'wp-content/')); require $path . 'wp-blog-header.php'; echo '',"\n"; if ( ! dynamic_sidebar( 'primary-widget-area' ) ) { echo ''; } ?> </code></pre> <p>All fine so far; this is enough to load Wordpress and it to find all the relevant plugins. However they produce errors at various points (specifically <code>wp-includes/post-template.php</code> line 29) because they need to use things like <a href="http://codex.wordpress.org/Function_Reference/get_the_ID" rel="nofollow">get_the_id()</a>, <a href="http://codex.wordpress.org/Function_Reference/in_category" rel="nofollow">in_category()</a> and properties of the post object to highlight certain posts and so on and no post has been loaded yet.</p> <p>How can I tell Wordpress to load a specific post ID in the code above, as if I'd gone to a URL like <code>http://example.com?p=1</code>, but without outputting a full page? I just want the environment to be setup as if post was active, then I can pass the current post ID as a parameter in my ESI call.</p> <p>I thought <a href="http://codex.wordpress.org/Function_Reference/query_posts" rel="nofollow">query_posts()</a> might help and I tried adding:</p> <pre><code>query_posts( 'p=5' ); </code></pre> <p>but it doesn't do anything.</p> <p>I also wondered about <code>WP_Post::get_instance()</code> (it only seems to take an object though, not a post ID). </p> <p>Is there anything else I can use? </p>

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