Forminator - autofill hidden fields with custom usermeta from DB

forminator-hidden-field-usermeta.php

<?php 

/**
* Plugin Name: [Forminator] autofill hidden fields with custom usermeta from DB
* Plugin URI: https://premium.wpmudev.org/
* Description: Autmatically fills in hidden fields with usermeta from DB
* Author: adczk 
* Author URI: https://premium.wpmudev.org/
* License: GPLv2 or later
*
* Tested with Forminator  1.23.0
*
* config explained in code comment
*
* note: use as MU plugin
*
*/

add_action( 'forminator_before_form_render', 'wpmudev_generate_usermeta_hidden_data', 10, 5 );
function wpmudev_generate_usermeta_hidden_data( $id, $form_type, $post_id, $form_fields, $form_settings ){

  # replace the number below with and ID of your form (form ID is the number you see in form's shortcode) 
	if( $id == 16091 ){		
		add_filter( 'forminator_field_hidden_field_value', 'wpmudev_prefill_hidden_usermeta', 10, 2);
	}
}

function wpmudev_prefill_hidden_usermeta( $value, $saved_value ) {
	
	
	# configure replacement macros 
	# key (left) is the custom word that you want to replace
	# you need to set it exactly the same as a custom value of hidden field
	# value (right) is the exact user meta field name, as seen in usermeta table in DB
	
	$replacements = array(
	
	'%user_desc%' => 'description', 
	'%user_activity%' => 'last_activity',
	
	);
	
		
	######### DON'T EDIT BELOW #########
	
	if( !is_user_logged_in() ){
		return $saved_value;
	}
	$user_id = get_current_user_id();
	
	if ( array_key_exists( $value, $replacements ) ) {
	
		$meta_value = get_user_meta( $user_id, $replacements[$value], true );
		if ($meta_value) {
			return $meta_value;
		}
		
	}
		
	return $saved_value;
		
	
}