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I'm interested in writing a caching function for Ajax calls.

If a third party plugin does their thing, calls wp_ajax_whatever, how do I pick that off?

If a person does slideshow updates with a plugin that uses Ajax, e.g. wp_ajax_plugin_update_slider, I want to empty my template cache when this happens. How do I do this?

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If you check the source for admin-ajax.php you will notice that the admin_init hook fires and that the system checks $_REQUEST['action'] for hooks. Given that, you could hook to admin_init, check the "request" super global, construct wp_ajax_* and wp_ajax_nopriv_* values, then use has_action() to see if anything is hooked in.

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