// Ẩn top bar admin
// function hide_admin_bar(){ return false; }
// add_filter( 'show_admin_bar', 'hide_admin_bar' );

add_filter('flatsome_lightbox_close_btn_inside', '__return_true');

// Thêm các file css, js
function add_theme_scripts_client() {
    $ver = "1.1";
    wp_enqueue_style('custom-css', get_template_directory_uri() . '-child' . '/customs/style.css', array(), $ver, 'all');
}

add_action('wp_enqueue_scripts', 'add_theme_scripts_client');

// Button trang chi tiết sản phẩm
function add_button_product_detail() {
    $html = '';
    if (is_singular('product')) {
        $linkDownload = get_field('link_download_hdsd') ?  get_field('link_download_hdsd') : '#popup-form';

        $html = '<div id="button-product-detail">
                    <a href="#popup-form" class="button alert is-larger lowercase animate-scale" style="border-radius: 100px;"><span>Nhận báo giá</span></a>
                    <a href="'.$linkDownload.'" class="button is-larger lowercase animate-scale disable-color" style="border-radius: 100px;"><span>Hướng dẫn sử dụng</span></a>
                 </div>';
    }
    echo $html;
}

add_action('flatsome_custom_single_product_1', 'add_button_product_detail');

// Config số lượng sản phẩm liên quan
function change_number_related_products( $args ) {
    $args['posts_per_page'] = 4;
    return $args;
}
add_filter( 'woocommerce_output_related_products_args', 'change_number_related_products', 20 );


// Custom section sản phẩm liên quan

function custom_related_product() {
    $html = '';
    if (is_singular('product')) {
        global $product;
        $link = $product->get_permalink();
        $sku = $product->get_sku() ? $product->get_sku() : 'N/A';
        $category = get_the_terms( $product->get_id(), 'product_cat' ) ? get_the_terms( $product->get_id(), 'product_cat' )[0]->name : 'N/A';
        $size = $product->get_attribute( 'kich-co' ) ? $product->get_attribute( 'kich-co' ) : 'N/A';
        $excaly = $product->get_attribute( 'do-chinh-xac' ) ? $product->get_attribute( 'do-chinh-xac' ) : 'N/A' ;

        $html = '<div class="button-wrapper">
                    <a href="'.$link.'" class="button alert is-larger lowercase" style="border-radius: 100px;"><span>Xem thêm</span></a>
                 </div>
                 <ul class="config-wrapper">
                     <li>
                        <span class="icon"><img src="'.home_url() .'/' . 'wp-content/uploads/2021/07/point.png'.'" alt=""></span>
                        <span class=config-value>Models: '.$sku.'</span>
                     </li>
                     <li>
                        <span class="icon"><img src="'.home_url() .'/' . 'wp-content/uploads/2021/07/point.png'.'" alt=""></span>
                        <span class=config-value>'.$category.'</span>
                     </li>
                     <li>
                        <span class="icon"><img src="'.home_url() .'/' . 'wp-content/uploads/2021/07/point.png'.'" alt=""></span>
                        <span class=config-value>Kích cỡ: '.$size.'</span>
                     </li>
                     <li>
                        <span class="icon"><img src="'.home_url() .'/' . 'wp-content/uploads/2021/07/point.png'.'" alt=""></span>
                        <span class=config-value>Độ chính xác: '.$excaly.'</span>
                     </li>
                 </ul>
                 ';
    }

    echo $html;
}

add_action('flatsome_product_box_after','custom_related_product');

// Remove tab đánh giá trong chi tiết sản phẩm
function remove_product_tabs( $tabs ) {
    if (is_singular('product')) {
        unset( $tabs['reviews'] );
    }
    return $tabs;
}
add_filter( 'woocommerce_product_tabs', 'remove_product_tabs', 98 );

// Add thêm tab trong chi tiết sản phẩm
function add_new_product_tab( $tabs ) {
    if (is_singular('product')) {
        $tabs['configs_tab'] = array(
            'title'     => __( 'Thông số kỹ thuật', 'woocommerce' ),
            'priority'  => 50,
            'callback'  => 'add_content_configs_tab'
        );

        $tabs['certifications_tab'] = array(
            'title'     => __( 'Chứng chỉ sản phẩm', 'woocommerce' ),
            'priority'  => 50,
            'callback'  => 'add_content_certifications_tab'
        );

        $tabs['accessaries_tab'] = array(
            'title'     => __( 'Phụ kiện', 'woocommerce' ),
            'priority'  => 50,
            'callback'  => 'add_content_accessaries_tab'
        );
    }
    return $tabs;
}
add_filter( 'woocommerce_product_tabs', 'add_new_product_tab' );

// Tab thông số kĩ thuật
function add_content_configs_tab() {
    $content = get_field('configs_tab_detail');
    if ($content) {
        echo $content;
    } else {
        echo "<p>Đang cập nhật...</p>";
    }
}

// Tab chứng chỉ
function add_content_certifications_tab() {
    $images = get_field('certifications_tab_img');
    $html = '';
    if ($images) {
        $html = '<ul id="tab-cretification-img">';
                    foreach( $images as $img ) {
                        $html .= '<li><img src="'.esc_url($img['sizes']['thumbnail']).'" alt="'.esc_attr($img['alt']).'" /></li>';
                    }
        $html .= '</ul>';
    } else {
        echo "<p>Đang cập nhật...</p>";
    }
    echo $html;
}

// Tab phụ kiện
function add_content_accessaries_tab() {
    $content = get_field('accessaries_tab_detail');
    if ($content) {
        echo $content;
    } else {
        echo "<p>Đang cập nhật...</p>";
    }
}

// Tiêu đề trang danh mục sản phẩm
function add_title_category_name() {
    $title = '';
    // Lấy info danh mục
    global $wp_query;
    $cat = $wp_query->get_queried_object();
    if (is_product_category() && $cat->name) {
        $title = '<h2 id="category-name" class="text-center">'.$cat->name.'</h2>';
    }
    echo $title;
}
add_action('woocommerce_before_main_content','add_title_category_name');

// Lấy mã sản phẩm trang danh mục

function get_sku_category_product() {
    $html = '';
    if (is_product_category() || is_shop()) {
        global $product;
        $title = $product->get_sku() ? $product->get_sku() : $product->get_title();
        $link = $product->get_permalink();
        $html = '<div class="title-wrapper custom-title">
                    <p class="name product-title woocommerce-loop-product__title">
                        <a href="'.$link.'" class="woocommerce-LoopProduct-link woocommerce-loop-product__link">'.$title.'</a>
                    </p>
                </div>';
    }
    echo $html;

}

add_action('flatsome_product_box_after','get_sku_category_product');

// Meta description for posts + WooCommerce products
function zoyi_meta_description() {
    if (is_singular()) {
        global $post;
        $desc = trim(wp_strip_all_tags(get_the_excerpt($post)));
        if (empty($desc)) {
            $desc = trim(wp_strip_all_tags(wp_trim_words($post->post_content, 30, '...')));
        }
        if (!empty($desc)) {
            echo '<meta name="description" content="' . esc_attr($desc) . '">' . "
";
        }
    }
}
add_action('wp_head', 'zoyi_meta_description', 1);


// === SEO: Organization Schema + WebSite Schema + BreadcrumbList Schema ===
function zoyi_seo_schema() {
    // Organization Schema
    $org = array(
        '@context' => 'https://schema.org',
        '@type' => 'Organization',
        'name' => 'Zoyi Việt Nam',
        'url' => 'https://zoyi.vn',
        'logo' => 'https://zoyi.vn/wp-content/uploads/2021/08/favicon.png',
        'description' => 'Đồng hồ vạn năng và thiết bị đo lường điện chính hãng chất lượng cao',
        'address' => array(
            '@type' => 'PostalAddress',
            'addressCountry' => 'VN',
        ),
        'sameAs' => array(
            'https://www.facebook.com/zoyi.vietnam',
        ),
    );
    
    // WebSite Schema with SearchAction
    $website = array(
        '@context' => 'https://schema.org',
        '@type' => 'WebSite',
        'name' => 'Zoyi Việt Nam',
        'url' => 'https://zoyi.vn',
        'potentialAction' => array(
            '@type' => 'SearchAction',
            'target' => 'https://zoyi.vn/?s={search_term_string}',
            'query-input' => 'required name=search_term_string',
        ),
    );
    
    echo '<script type="application/ld+json">' . json_encode($org, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\n";
    echo '<script type="application/ld+json">' . json_encode($website, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\n";
    
    // BreadcrumbList Schema for single posts/products
    if (is_singular()) {
        global $post;
        $breadcrumb = array(
            '@context' => 'https://schema.org',
            '@type' => 'BreadcrumbList',
            'itemListElement' => array(),
        );
        
        // Home
        $breadcrumb['itemListElement'][] = array(
            '@type' => 'ListItem',
            'position' => 1,
            'name' => 'Trang chủ',
            'item' => 'https://zoyi.vn',
        );
        
        // Blog or Product category
        if (is_product()) {
            $breadcrumb['itemListElement'][] = array(
                '@type' => 'ListItem',
                'position' => 2,
                'name' => 'Sản phẩm',
                'item' => 'https://zoyi.vn/products/',
            );
        } elseif (is_single()) {
            $breadcrumb['itemListElement'][] = array(
                '@type' => 'ListItem',
                'position' => 2,
                'name' => 'Blog',
                'item' => 'https://zoyi.vn/blog/',
            );
        }
        
        // Current page
        $breadcrumb['itemListElement'][] = array(
            '@type' => 'ListItem',
            'position' => count($breadcrumb['itemListElement']) + 1,
            'name' => get_the_title(),
            'item' => get_permalink(),
        );
        
        echo '<script type="application/ld+json">' . json_encode($breadcrumb, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\n";
    }
}
add_action('wp_head', 'zoyi_seo_schema', 5);

// === SEO: Article Schema for blog posts ===
function zoyi_article_schema() {
    if (is_single() && !is_product()) {
        global $post;
        $schema = array(
            '@context' => 'https://schema.org',
            '@type' => 'Article',
            'headline' => get_the_title(),
            'url' => get_permalink(),
            'datePublished' => get_the_date('c'),
            'dateModified' => get_the_modified_date('c'),
            'author' => array(
                '@type' => 'Organization',
                'name' => 'Zoyi Việt Nam',
                'url' => 'https://zoyi.vn',
            ),
            'publisher' => array(
                '@type' => 'Organization',
                'name' => 'Zoyi Việt Nam',
                'logo' => array(
                    '@type' => 'ImageObject',
                    'url' => 'https://zoyi.vn/wp-content/uploads/2021/08/favicon.png',
                ),
            ),
            'description' => trim(wp_strip_all_tags(get_the_excerpt($post))),
        );
        
        if (has_post_thumbnail()) {
            $schema['image'] = array(
                '@type' => 'ImageObject',
                'url' => get_the_post_thumbnail_url($post, 'full'),
            );
        }
        
        echo '<script type="application/ld+json">' . json_encode($schema, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\n";
    }
}
add_action('wp_head', 'zoyi_article_schema', 6);


// === 8. Open Graph Tags ===
function zoyi_og_tags() {
    if (is_front_page() || is_home()) {
        echo '<meta property="og:type" content="website">' . "\n";
        echo '<meta property="og:title" content="Zoyi Vietnam - Dong Ho Van Nang Chinh Hang">' . "\n";
        echo '<meta property="og:description" content="Zoyi.vn - Dong ho van nang va thiet bi do luong dien chinh hang chat luong cao.">' . "\n";
        echo '<meta property="og:url" content="https://zoyi.vn/">' . "\n";
        echo '<meta property="og:image" content="https://zoyi.vn/wp-content/uploads/2021/08/favicon.png">' . "\n";
        echo '<meta property="og:site_name" content="Zoyi Vietnam">' . "\n";
    } elseif (is_singular()) {
        global $post;
        $title = get_the_title();
        $desc = trim(wp_strip_all_tags(get_the_excerpt($post)));
        if (empty($desc)) {
            $desc = trim(wp_strip_all_tags(wp_trim_words($post->post_content, 30, '...')));
        }
        $url = get_permalink();
        $image = has_post_thumbnail() ? get_the_post_thumbnail_url($post, 'large') : 'https://zoyi.vn/wp-content/uploads/2021/08/favicon.png';
        echo '<meta property="og:type" content="' . (is_product() ? 'product' : 'article') . '">' . "\n";
        echo '<meta property="og:title" content="' . esc_attr($title) . '">' . "\n";
        echo '<meta property="og:description" content="' . esc_attr($desc) . '">' . "\n";
        echo '<meta property="og:url" content="' . esc_url($url) . '">' . "\n";
        echo '<meta property="og:image" content="' . esc_url($image) . '">' . "\n";
        echo '<meta property="og:site_name" content="Zoyi Vietnam">' . "\n";
        echo '<meta name="twitter:card" content="summary_large_image">' . "\n";
        echo '<meta name="twitter:title" content="' . esc_attr($title) . '">' . "\n";
        echo '<meta name="twitter:description" content="' . esc_attr($desc) . '">' . "\n";
    } elseif (is_archive() || is_category()) {
        $title = get_the_archive_title();
        echo '<meta property="og:type" content="website">' . "\n";
        echo '<meta property="og:title" content="' . esc_attr($title) . ' | Zoyi Vietnam">' . "\n";
        echo '<meta property="og:url" content="' . esc_url(get_permalink()) . '">' . "\n";
        echo '<meta property="og:site_name" content="Zoyi Vietnam">' . "\n";
    }
}
add_action('wp_head', 'zoyi_og_tags', 2);

// === 9. Title Fix for Flatsome ===
function zoyi_fix_title($title_parts) {
    if (is_front_page() || is_home()) {
        $title_parts['title'] = 'Dong ho van nang chinh hang - Zoyi Vietnam';
    } elseif (is_single()) {
        $title_parts['title'] = get_the_title() . ' | Zoyi Vietnam';
    } elseif (is_page()) {
        $title_parts['title'] = get_the_title() . ' | Zoyi Vietnam';
    }
    unset($title_parts['site']);
    return $title_parts;
}
add_filter('document_title_parts', 'zoyi_fix_title', 20);


// === 9b. Category Pages SEO ===
// Meta description for categories/tags without custom description
add_action('wp_head', function() {
    if (!is_category() && !is_tag() && !is_tax()) return;
    $obj = get_queried_object();
    if (!$obj) return;
    $desc = $obj->description;
    if (!$desc) {
        $name = $obj->name;
        if (is_category()) {
            $desc = 'Tim hieu ve ' . $name . ' - Xem review, huong dan su dung, so sanh gia ' . $name . ' chinh hang tai Zoyi Vietnam. San pham chat luong cao, gia tot.';
        } elseif (is_tag()) {
            $desc = 'Cac bai viet ve ' . $name . ' - Huong dan, review chi tiet tai Zoyi Vietnam.';
        }
    }
    if ($desc) {
        echo '<meta name="description" content="' . esc_attr($desc) . '">' . "\\n";
    }
}, 1);

// Category BreadcrumbList Schema
add_action('wp_head', function() {
    if (!is_category() && !is_tag() && !is_tax()) return;
    $obj = get_queried_object();
    if (!$obj) return;
    $name = $obj->name;
    $url = get_term_link($obj);
    if (is_wp_error($url)) return;
    $schema = array(
        '@context' => 'https://schema.org',
        '@type' => 'BreadcrumbList',
        'itemListElement' => array(
            array('@type' => 'ListItem', 'position' => 1, 'name' => 'Trang chu', 'item' => 'https://zoyi.vn/'),
            array('@type' => 'ListItem', 'position' => 2, 'name' => $name, 'item' => $url)
        )
    );
    echo '<script type="application/ld+json">' . json_encode($schema, JSON_UNESCAPED_UNICODE) . '</script>' . "\\n";
}, 1);

// === 9c. LocalBusiness / Store Schema (GEO Optimization) ===
// Add Store schema ONLY on homepage
add_action('wp_head', function() {
    if (!is_front_page() && !is_home()) return;
    $schema = array(
        '@context' => 'https://schema.org',
        '@type' => array('Store', 'LocalBusiness', 'Organization'),
        'name' => 'Zoyi Vietnam - Dong Ho Van Nang Chinh Hang',
        'description' => 'Zoyi Vietnam phan phoi dong ho van nang, thiet bi do luong dien chinh hang. San pham ZOYI chat luong cao, gia tot, bao hanh 12 thang.',
        'url' => 'https://zoyi.vn/',
        'telephone' => '+84-28-XXXX-XXXX',
        'email' => 'contact@zoyi.vn',
        'address' => array(
            '@type' => 'PostalAddress',
            'streetAddress' => 'XX Le Lai, Q1',
            'addressLocality' => 'Ho Chi Minh City',
            'addressRegion' => 'Ho Chi Minh',
            'postalCode' => '700000',
            'addressCountry' => 'VN'
        ),
        'geo' => array(
            '@type' => 'GeoCoordinates',
            'latitude' => '10.7769',
            'longitude' => '106.7009'
        ),
        'openingHoursSpecification' => array(
            array('@type' => 'OpeningHoursSpecification',
                'dayOfWeek' => array('Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'),
                'opens' => '08:00', 'closes' => '18:00')
        ),
        'sameAs' => array('https://www.facebook.com/zoyivietnam'),
        'priceRange' => '₫₫',
        'image' => 'https://zoyi.vn/wp-content/uploads/2021/08/favicon.png'
    );
    echo '<script type="application/ld+json">' . json_encode($schema, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\\n";
}, 3);

// FAQ Schema for blog posts (AIO optimization - helps appear in AI Overviews)
add_action('wp_head', function() {
    if (!is_single()) return;
    global $post;
    if (!$post) return;
    // Only add FAQ schema if post has FAQ content in first few paragraphs
    $content = $post->post_content;
    // Check if content has at least one question format
    if (!preg_match('/(câu hỏi|tại sao|bao nhieu|bao lâu|lam sao|hướng dẫn|là gì|là bao nhiêu|nên|mấy)/i', $content)) return;
    
    $faqs = array();
    // Extract Q&A pairs from content
    preg_match_all('/<h([23])[^>]*>([^<]*)<\/h[23]>/i', $content, $matches);
    for ($i = 0; $i < count($matches[0]) - 1; $i++) {
        $q = trim(strip_tags($matches[2][$i]));
        $next_idx = $i + 1;
        $a_start = strpos($content, $matches[0][$i]) + strlen($matches[0][$i]);
        $a_end = isset($matches[0][$next_idx]) ? strpos($content, $matches[0][$next_idx]) : strlen($content);
        $a_text = trim(strip_tags(substr($content, $a_start, $a_end - $a_start)));
        if (strlen($q) > 5 && strlen($a_text) > 10 && strlen($a_text) < 500) {
            $faqs[] = array('@type' => 'Question',
                'name' => $q,
                'acceptedAnswer' => array('@type' => 'Answer', 'text' => $a_text));
        }
        if (count($faqs) >= 5) break;
    }
    if (empty($faqs)) return;
    
    $schema = array('@context' => 'https://schema.org', '@type' => 'FAQPage', 'mainEntity' => $faqs);
    echo '<script type="application/ld+json">' . json_encode($schema, JSON_UNESCAPED_UNICODE) . '</script>' . "\\n";
}, 1);

// === 10. WooCommerce Product Schema// === 10. WooCommerce Product Schema (Enhanced) ===
add_action('wp', function() {
    $type = get_post_type(get_queried_object_id());
    if ($type !== 'product') return;
    if (!function_exists('wc_get_product')) return;
    $pid = get_queried_object_id();
    $product = wc_get_product($pid);
    if (!$product) return;
    $name = get_the_title();
    $desc = wp_strip_all_tags($product->get_description());
    if (strlen($desc) > 500) $desc = mb_substr($desc, 0, 500);
    $url = get_permalink();
    $img = wp_get_attachment_url($product->get_image_id());
    $price = $product->get_price();
    $reg_price = $product->get_regular_price();
    $sale_price = $product->get_sale_price();
    $curr = get_woocommerce_currency();
    $avail = $product->is_in_stock() ? 'https://schema.org/InStock' : 'https://schema.org/OutOfStock';
    $sku = $product->get_sku() ?: 'ZOYI-' . $pid;
    $rc = $product->get_rating_count();
    $ar = $product->get_average_rating();
    $schema = array(
        '@context' => 'https://schema.org',
        '@type' => 'Product',
        'name' => $name,
        'description' => $desc,
        'url' => $url,
        'image' => $img,
        'brand' => array('@type' => 'Brand', 'name' => 'ZOYI'),
        'sku' => $sku,
        'offers' => array(
            '@type' => 'Offer',
            'price' => $price ?: '0',
            'priceCurrency' => $curr,
            'availability' => $avail,
            'seller' => array('@type' => 'Organization', 'name' => 'Zoyi Vietnam'),
            'url' => $url,
            'shippingDetails' => array(
                '@type' => 'OfferShippingDetails',
                'shippingRate' => array('@type' => 'MonetaryAmount', 'value' => '0', 'currency' => 'VND'),
                'deliveryTime' => array('@type' => 'ShippingDeliveryTime', 'handlingTime' => array('@type' => 'QuantitativeValue', 'minValue' => '0', 'maxValue' => '1', 'unitCode' => 'DAY'), 'transitTime' => array('@type' => 'QuantitativeValue', 'minValue' => '1', 'maxValue' => '3', 'unitCode' => 'DAY'))
            ),
            'hasMerchantReturnPolicy' => array('@type' => 'MerchantReturnPolicy', 'returnPolicyCategory' => 'https://schema.org/MerchantReturnFiniteReturnWindow', 'merchantReturnDays' => '7')
        )
    );
    if ($sale_price && floatval($sale_price) > 0) {
        $schema['offers']['priceSpecification'] = array('@type' => 'UnitPriceSpecification', 'price' => $reg_price, 'priceCurrency' => $curr, 'unitCode' => 'UNIT');
    }
    if ($rc > 0) {
        $schema['aggregateRating'] = array('@type' => 'AggregateRating', 'ratingValue' => number_format($ar, 1), 'reviewCount' => $rc, 'bestRating' => '5', 'worstRating' => '1');
    }
    echo '<script type="application/ld+json">' . json_encode($schema, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\\n";
}, 5);
// === 10. WooCommerce Product Schema ===
add_action('wp', function() {
    $type = get_post_type(get_queried_object_id());
    if ($type !== 'product') return;
    if (!function_exists('wc_get_product')) return;
    $pid = get_queried_object_id();
    $product = wc_get_product($pid);
    if (!$product) return;
    $name = get_the_title();
    $desc = wp_strip_all_tags($product->get_description());
    if (strlen($desc) > 500) $desc = mb_substr($desc, 0, 500);
    $url = get_permalink();
    $img = wp_get_attachment_url($product->get_image_id());
    $price = $product->get_price();
    $curr = get_woocommerce_currency();
    $avail = $product->is_in_stock() ? 'InStock' : 'OutOfStock';
    $sku = $product->get_sku() ?: 'ZOYI-' . $pid;
    $rc = $product->get_rating_count();
    $ar = $product->get_average_rating();
    $schema = array(
        '@context' => 'https://schema.org',
        '@type' => 'Product',
        'name' => $name,
        'description' => $desc,
        'url' => $url,
        'image' => $img,
        'brand' => array('@type' => 'Brand', 'name' => 'ZOYI'),
        'offers' => array('@type' => 'Offer', 'price' => $price, 'priceCurrency' => $curr, 'availability' => 'https://schema.org/' . $avail, 'seller' => array('@type' => 'Organization', 'name' => 'Zoyi Vietnam')),
        'sku' => $sku
    );
    if ($rc > 0) $schema['aggregateRating'] = array('@type' => 'AggregateRating', 'ratingValue' => number_format($ar, 1), 'reviewCount' => $rc);
    echo '<script type="application/ld+json">' . json_encode($schema, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\\n";
}, 5);
// === 11. Lazy Loading for Images ===
function zoyi_lazy_load_images($content) {
    if (is_feed() || is_preview() || is_admin()) return $content;
    return str_replace(' src="https://zoyi.vn/wp-content/uploads/', ' loading="lazy" src="https://zoyi.vn/wp-content/uploads/', $content);
}
add_filter('the_content', 'zoyi_lazy_load_images', 99);