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Edit File: 4.0.0-groupings-to-interests.php

<?php

defined( 'ABSPATH' ) or exit;

/**
 * @ignore
 * @return object
 */
function _mc4wp_400_find_grouping_for_interest_category( $groupings, $interest_category ) {
	foreach ( $groupings as $grouping ) {
		// cast to stdClass because of missing class
		$grouping = (object) (array) $grouping;

if ( $grouping->name === $interest_category->title ) {
			return $grouping;
		}
	}

return null;
}

/**
 * @ignore
 * @return object
 */
function _mc4wp_400_find_group_for_interest( $groups, $interest ) {
	foreach ( $groups as $group_id => $group_name ) {
		if ( $group_name === $interest->name ) {
			return (object) array(
				'name' => $group_name,
				'id'   => $group_id,
			);
		}
	}

return null;
}

// in case the migration is _very_ late to the party
if ( ! class_exists( 'MC4WP_API_V3' ) ) {
	return;
}

$options = get_option( 'mc4wp', array() );
if ( empty( $options['api_key'] ) ) {
	return;
}

// get current state from transient
$lists = get_transient( 'mc4wp_mailchimp_lists_fallback' );
if ( empty( $lists ) ) {
	return;
}

@set_time_limit( 600 );
$api_v3 = new MC4WP_API_V3( $options['api_key'] );
$map    = array();

foreach ( $lists as $list ) {

// cast to stdClass because of missing classes
	$list = (object) (array) $list;

// no groupings? easy!
	if ( empty( $list->groupings ) ) {
		continue;
	}

// fetch (new) interest categories for this list
	try {
		$interest_categories = $api_v3->get_list_interest_categories( $list->id );
	} catch ( MC4WP_API_Exception $e ) {
		continue;
	}

foreach ( $interest_categories as $interest_category ) {

// compare interest title with grouping name, if it matches, get new id.
		$grouping = _mc4wp_400_find_grouping_for_interest_category( $list->groupings, $interest_category );
		if ( ! $grouping ) {
			continue;
		}

$groups = array();

try {
			$interests = $api_v3->get_list_interest_category_interests( $list->id, $interest_category->id );
		} catch ( MC4WP_API_Exception $e ) {
			continue;
		}

foreach ( $interests as $interest ) {
			$group = _mc4wp_400_find_group_for_interest( $grouping->groups, $interest );

if ( $group ) {
				$groups[ $group->id ]   = $interest->id;
				$groups[ $group->name ] = $interest->id;
			}
		}

$map[ (string) $grouping->id ] = array(
			'id'     => $interest_category->id,
			'groups' => $groups,
		);
	}
}

if ( ! empty( $map ) ) {
	update_option( 'mc4wp_groupings_map', $map );
}

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