Fix donor export for donors with multiple mailing addresses

give_export_get_data_donors.php

<?php

add_filter('give_export_get_data_donors', function($exportData) {
    global $wpdb;
    
    /**
     * Map of output column names to their meta key prefixes
     */
    $addressFields = [
        'address_line1' => '_give_donor_address_billing_line1',
        'address_line2' => '_give_donor_address_billing_line2',
        'address_city' => '_give_donor_address_billing_city',
        'address_state' => '_give_donor_address_billing_state',
        'address_zip' => '_give_donor_address_billing_zip',
        'address_country' => '_give_donor_address_billing_country',
    ];

    // Get the table prefix
    $donorTable = $wpdb->prefix . 'give_donors';
    $donorMetaTable = $wpdb->prefix . 'give_donormeta';

    // Process each row in the export data
    foreach ($exportData as &$row) {
        // Get the donor ID from the row - try both possible identifiers
        $donorId = null;
        
        // First, try to get donor ID from the row data by querying for the email or name
        if (isset($row['email']) && !empty($row['email'])) {
            $donorId = $wpdb->get_var(
                $wpdb->prepare(
                    "SELECT id FROM {$donorTable} WHERE email = %s LIMIT 1",
                    $row['email']
                )
            );
        }

        // If still no donor ID, try by name
        if (!$donorId && isset($row['full_name']) && !empty($row['full_name'])) {
            $donorId = $wpdb->get_var(
                $wpdb->prepare(
                    "SELECT id FROM {$donorTable} WHERE name = %s LIMIT 1",
                    $row['full_name']
                )
            );
        }

        // If we still don't have a donor ID, skip this row
        if (!$donorId) {
            continue;
        }

        // For each address field, check if we need to look for alternate suffixes
        foreach ($addressFields as $outputKey => $fieldBase) {
            // If the field is null or empty, try _0 through _10
            if (!isset($row[$outputKey]) || is_null($row[$outputKey]) || $row[$outputKey] === '') {
                $row[$outputKey] = ''; // Initialize with empty string
                
                for ($i = 0; $i <= 10; $i++) {
                    $metaKey = $fieldBase . '_' . $i;
                    
                    $value = $wpdb->get_var(
                        $wpdb->prepare(
                            "SELECT meta_value FROM {$donorMetaTable} 
                             WHERE donor_id = %d AND meta_key = %s LIMIT 1",
                            $donorId,
                            $metaKey
                        )
                    );
                    
                    if (!empty($value)) {
                        $row[$outputKey] = $value;
                        break;
                    }
                }
            }
        }
    }

    return $exportData;
});