Add standard autocomplete attributes to Fluent Form address fields

functions.php

<?php

/**
 * Add standard autocomplete attributes to Fluent Form standard fields
 * to improve Chrome autofill recognition.
 *
 * @param array $field The field properties.
 * @param array $form  The form properties.
 * @return array The modified field properties.
 */
add_filter(
    hook_name: "fluentform/rendering_field_data_address",
    callback: "add_fluent_autocomplete_attributes",
    priority: 999,
    accepted_args: 1
);
add_filter(
    hook_name: "fluentform/rendering_field_data_input_name",
    callback: "add_fluent_autocomplete_attributes",
    priority: 999,
    accepted_args: 1
);
add_filter(
    hook_name: "fluentform/rendering_field_data_input_email",
    callback: "add_fluent_autocomplete_attributes",
    priority: 999,
    accepted_args: 1
);
add_filter(
    hook_name: "fluentform/rendering_field_data_phone",
    callback: "add_fluent_autocomplete_attributes",
    priority: 999,
    accepted_args: 1
);
function add_fluent_autocomplete_attributes($field): mixed
{
    // Define autocomplete mappings for different field types
    $autocomplete_mappings = [
        "input_name" => [
            "first_name" => "given-name",
            "middle_name" => "additional-name",
            "last_name" => "family-name",
        ],
        "input_email" => "email",
        "phone" => "tel",
        "address" => [
            "address_line_1" => "address-line1",
            "address_line_2" => "address-line2",
            "city" => "address-level2",
            "state" => "address-level1",
            "zip" => "postal-code",
            "country" => "country",
        ],
    ];

    // Determine field type from element or infer from context
    $fieldType = $field["element"] ?? null;

    // Handle complex fields with sub-fields (address, input_name)
    if (isset($field["fields"]) && is_array(value: $field["fields"])) {
        foreach ($field["fields"] as $fieldName => &$subField) {
            if (isset($autocomplete_mappings[$fieldType][$fieldName])) {
                $subField["attributes"]["autocomplete"] =
                    $autocomplete_mappings[$fieldType][$fieldName];
            }
        }
    }
    // Handle simple fields (input_email, phone)
    else {
        if (
            isset($autocomplete_mappings[$fieldType]) &&
            is_string(value: $autocomplete_mappings[$fieldType])
        ) {
            $field["attributes"]["autocomplete"] =
                $autocomplete_mappings[$fieldType];
        }
    }

    return $field;
}