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    <p><strong>First attempt (don't use this... see the 'edit' below)</strong>:</p> <p>First, you need to set your shortcode with something like this:</p> <pre><code>add_shortcode( 'metashortcode', 'metashortcode_addshortcode' ); </code></pre> <p>Then, you'll create the function in which you'll have to add a hook to <code>wp_head</code> with something like that:</p> <pre><code>function metashortcode_addshortcode() { add_action('wp_head', 'metashortcode_setmeta'); } </code></pre> <p>Then, you'll define what you want to do in the <code>wp_head</code> :</p> <pre><code>function metashortcode_setmeta() { echo '&lt;meta name="key" content="value"&gt;'; } </code></pre> <p>Adding the shortcode <code>[metashortcode]</code> should add your meta data as needed. The code was provided only to help you understand how to make it happen. It was not fully tested.</p> <p><strong>Edit : The previous code was just a concept and cannot work because of the execution order. Here is a working example that will get the expected result:</strong></p> <pre><code>// Function to hook to "the_posts" (just edit the two variables) function metashortcode_mycode( $posts ) { $shortcode = 'metashortcode'; $callback_function = 'metashortcode_setmeta'; return metashortcode_shortcode_to_wphead( $posts, $shortcode, $callback_function ); } // To execute when shortcode is found function metashortcode_setmeta() { echo '&lt;meta name="key" content="value"&gt;'; } // look for shortcode in the content and apply expected behaviour (don't edit!) function metashortcode_shortcode_to_wphead( $posts, $shortcode, $callback_function ) { if ( empty( $posts ) ) return $posts; $found = false; foreach ($posts as $post) { if ( stripos( $post-&gt;post_content, '[' . $shortcode ) !== false ) { add_shortcode( $shortcode, '__return_empty_string' ); $found = true; break; } } if ( $found ) add_action('wp_head', $callback_function ); return $posts; } // Instead of creating a shortcode, hook to the_posts add_action('the_posts', 'metashortcode_mycode'); </code></pre> <p>Enjoy!</p>
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    1. COThat's cool. I didn't realize that the shortcode got parsed BEFORE the wp_head actions happened. I'll give this a try right away. If you're right I'm sure it'll solve my problem nicely!
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    2. COMy suspicion was correct. wp_head actions are triggered BEFORE the shortcode gets parsed. So this solution doesn't work exactly as described. HOWEVER, the approach can be modified... [see my update above]
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    3. COSorry Emerson, I misunderstood what you were trying to do. It is NOT executed before. Therefore, I edited my solution to make it work properly.
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