Add custom field and field options to Search Filters WordPress Plugin

main.php

<?php

use Search_Filter\Fields\Settings as Fields_Settings;

class SearchFilters {
	public function __construct() {
		$this->init();
	}

	public function init() {
		$this->hooks();
	}

	public function hooks() {
		add_action( 'plugins_loaded', array($this, 'plugins_loaded') );
	}

	public function plugins_loaded() {
		add_filter( 'search-filter/field/choice/options', array($this, 'add_su_status_field_options'), 10, 2 );
		add_filter( 'search-filter/queries/query/apply_wp_query_args', array($this, 'filter_results'), 10, 1 );
		$this->add_status_field_option_to_data_type();
	}

	public function add_su_status_field_options( $options, $field ) {
		$data_type = $field->get_attribute( 'dataType' );
		if ($data_type === 'su_status') {
			return array(
				array(
					'value' => 'in-progress',
					'label' => 'In Progress',
				),
				array(
					'value' => 'not-started',
					'label' => 'Not started',
				)
			);
		}
		return $options;
	}

	public function filter_results( $query_args ) {
		$course_ids = learndash_user_get_enrolled_courses( get_current_user_id() );
		if (isset( $_GET['_field_15'] ) && $_GET['_field_15'] === 'in-progress') {
			$query_args['post__in'] = $course_ids;
		}

		return $query_args;
	}

	public function add_status_field_option_to_data_type() {
		$data_type_setting = Fields_Settings::get_setting( 'dataType' );
		if (!$data_type_setting) {
			return;
		}

		$acf_data_type_option = array(
			'label' => __( 'SU Status', 'search-filter' ),
			'value' => 'su_status',
		);

		$data_type_setting->add_option( $acf_data_type_option );
	}
}