Forminator 1.15.3 - very basic "stop-words" type spam filter for forms

forminator-stopwords-form-filter.php

<?php 

/**
 * Plugin Name: [Forminator] - very simple "stop words" type spam protection for forms
 * Description: prevents submission if defined fields contain defined strings
 * Author: Adam @ WPMUDEV
 * Author URI: https://wpmudev.com
 * License: GPLv2 or later
 *
 * Tested with Forminator 1.15.3 (backwards/future compatibility unknown)
*/


add_filter( 'forminator_spam_protection', 'wpmu_forminator_stop_words', 10, 4);

function wpmu_forminator_stop_words( $is_spam, $field_data_array, $form_id, $module ) {
	
	// define "stop words" below; as in example;
	// if there are these strings in defined fields
	// form will return "something went wrong" error and not get submitted
	$stopwords = array(
		'test',
		'something',
		'[email protected]'
	);
	
	
	// define fields to check 
	$fields_to_check = array('textarea-1', 'text-1');
	
	
	foreach( $field_data_array as $field ) {
		
		if ( in_array( $field['name'], $fields_to_check ) ) {
			
			foreach( $stopwords as $word ) {
				
		
				if ( stripos( $field['value'], $word ) !== false ) {
					
					$is_spam = true;
					
				}
				
			}			
			
		}
		
	}	
		
	return $is_spam;
	
}