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I have several posts that contains some specific dynamic content that expects certain parameters that are stored in post's custom fields. The site uses self-developed plugin that uses global $post->ID to get the current post ID.

At the plugin init hook the global $post variable is not yet populated, so it's too early to retrieve the parameters stored in the custom fields. So at that stage I can just retrieve some plugin config parameters, nothing post-related.

What hook can I add to my plugin code that would be triggered when the global $post variable is available? I'd then populate a global array variable that is later used by plugin's shortcodes.

Another thing to take into account here is that there can be run-time errors when processing the post-specific data. In case of error, I'd like to redirect to an error page. So this means that I need to know the post ID before any content has started streaming to user's browser, otherwise the plugin can not perform http redirect to the error page.

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The earliest action you can use is 'wp'. You can read more about it here: Action WP.

  • While wp is the earliest action, one could argue that it’s not appropriate for code that may result in redirection. – Milo Jan 24 '18 at 21:48
  • It depends on what the user needs the query/post. WordPress would benefit from few more actions to handle everything done between 'wp' and 'template_redirect'. – Milan Petrovic Jan 24 '18 at 22:03
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The template_redirect action could be appropriate for this.

This action hook executes just before WordPress determines which template page to load. It is a good hook to use if you need to do a redirect with full knowledge of the content that has been queried.

You can see where this occurs in the request process in the Action Reference.

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