如何解决跨循环调用变量时的布尔类型错误？

错误原因 #

报错的核心问题是：在遍历$contact_numbers的循环里，你直接调用$map_location['address']这类数组键，但$map_location可能是布尔值false（当该自定义字段未填写内容时），此时尝试访问布尔值的数组偏移量就会触发这个错误。另外你在部门的Schema结构里重复写了@type字段，这会导致JSON结构异常。

修复方案 #

1. 提前判断$map_location是否为有效数组，再在循环中复用地址信息；
2. 提取地址信息为独立变量，减少重复代码；
3. 修复重复的@type字段，保证Schema结构合规。

修改后的完整代码 #

/**
 * 'wp_head' callback
 * Insert structured data into head
 */
public function add_address_schema() {
    // Return if not hospital post.
    if ( get_post_type() !== 'location' ) {
        return;
    }

    global $luna;
    $id_post         = get_the_id();
    $map_location    = get_field( 'map_location', $id_post );
    $contact_numbers = get_field( 'contact_numbers', $id_post );
    $thumbnail_id    = get_post_thumbnail_id( $id_post );
    $location_type   = $luna->utils->get_the_primary_term( 'location-type', $id_post );
    // 提前提取地址信息，避免重复判断
    $address_details = [];
    if ( $map_location && is_array( $map_location ) ) {
        $address_details = [
            '@type'           => 'PostalAddress',
            'streetAddress'   => $map_location['address'],
            'addressLocality' => $map_location['city'],
            'addressRegion'   => $map_location['state'],
            'postalCode'      => $map_location['post_code'],
            'addressCountry'  => $map_location['country_short'],
        ];
    }

    $address_schema = [
        '@context' => 'https://schema.org',
        '@type'    => $location_type ? $location_type->name : __( 'Hospital', 'luna' ),
        'name'     => get_the_title( $id_post ),
        'url'      => get_the_permalink( $id_post ),
    ];
    
    if ( $thumbnail_id ) {
        $address_schema['image'] = get_the_post_thumbnail_url( $id_post, 'large' );
    }
    
    if ( !empty( $address_details ) ) {
        $address_schema['address'] = $address_details;
        
        $address_schema['geo'] = [
            '@type'     => 'GeoCoordinates',
            'latitude'  => $map_location['lat'],
            'longitude' => $map_location['lng'],
        ];
    }
    
    if ( $contact_numbers && is_array( $contact_numbers ) && !empty( $address_details ) ) {
        $address_schema['department'] = [];
        $dept_type = $location_type ? $location_type->name : __( 'Hospital', 'luna' );
        foreach ( $contact_numbers as $contact ) {
            $address_schema['department'][] = [
                '@type'     => $dept_type,
                'name'      => $contact['label'],
                'telephone' => $contact['number'],
                'address'   => $address_details // 复用提前准备好的地址信息
            ];
        }
    }

    echo '<!-- Auto generated address structured data --><script type="application/ld+json">' . wp_json_encode( $address_schema, JSON_PRETTY_PRINT ) . '</script>';
}

关键修改点 #

• 新增$address_details变量，统一处理地址信息，避免重复编写相同代码；
• 在处理contact_numbers时，增加!empty( $address_details )的判断，确保只有当地址信息存在时才添加到部门结构中；
• 修复了部门结构里重复的@type问题，把地址信息作为address子节点嵌套，符合Schema规范；
• 所有访问$map_location的地方都增加了数组类型判断，避免布尔值导致的错误。

内容的提问来源于stack exchange，提问作者Ruth