Forminator - save submission id (entry id) in custom field upon post creation

forminator-submission-id-in-post-custom-field.php

<?php 

/*
Forminator - save submission ID in posts custom field upon new post creation
This is only post creation forms

Tested with Forminator 1.22.1
by adamcz/WPMU DEV
USE AS MU PLUGIN
Config explained in comments
*/


// get the entry ID into temporary $_POST key (as otherwise it's not available)
add_action( 'forminator_custom_form_submit_before_set_fields', 'forminator_customfield_entry_id', 20, 3 );
function forminator_customfield_entry_id( $entry, $form_id, $field_data_array ) {

	$_POST['_forminator_cform_entry_id'] = $entry->entry_id;
	$_POST['_forminator_cform_form_id']  = $form_id;

}


add_action( 'forminator_form_after_save_entry', 'forminator_customfield_entryid_set', 10, 2 );
function forminator_customfield_entryid_set( $form_id, $response ) {
	
	
	/* CONFIGURE HERE */
	$forms = array( 2297 ); // comma separated IDs of forms this should work with
	$postdata_field = 'postdata-1'; // field ID of post data field
	$customfield_id = 'MYCUSTOM'; // set the name of your custom field to be updated
	/* CONFIGURATION END */
	
	
	
	if ( ! in_array( $form_id, $forms ) ) {
		return;
	}
	
	if ( $response && is_array( $response ) ) {
		if ( $response['success'] ) {
			
			if ( $form_id == $_POST['_forminator_cform_form_id'] ) {
				
				// get entry ID
				$entry_id = $_POST['_forminator_cform_entry_id'];
				// fetch entry data	
				$entry =  Forminator_API::get_entry( $form_id, $entry_id );
				
				// get new post ID
				$postid = $entry->meta_data[$postdata_field]['value']['postdata'];

				update_post_meta( $postid, $customfield_id, $entry_id );
				
			
			}			
			
			
		}
	}
	
}