Take note, by the time the hook triggers, the post comments and metadata would have already been deleted. Use the before_delete_post hook to catch post deletion before that.
Let’s suppose you have a plugin that, for one reason or another, stores its own post metadata in a separate database table called codex_postmeta. One of the ways you can achieve synchronization is to be made aware when a post is deleted so that you can replicate the changes yourself.
add_action( 'admin_init', 'wpdocs_codex_init' );
function wpdocs_codex_init() {
add_action( 'delete_post', 'wpdocs_codex_sync', 10 );
}
function wpdocs_codex_sync( $pid ) {
global $wpdb;
$query = $wpdb->prepare( 'SELECT post_id FROM codex_postmeta WHERE post_id = %d', $pid );
$var = $wpdb->get_var( $query );
if ( $var ) {
$query2 = $wpdb->prepare( 'DELETE FROM codex_postmeta WHERE post_id = %d', $pid );
$wpdb->query( $query2 );
}
}
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Let’s suppose you have a plugin that, for one reason or another, stores its own post metadata in a separate database table called codex_postmeta. One of the ways you can achieve synchronization is to be made aware when a post is deleted so that you can replicate the changes yourself.