wordpress-kratos-yang/inc/theme-setting.php

<?php
/**
 * 站点相关函数
 * @author Yongquan Yang <yangyq.net>
 * @license MIT License
 * @version 2020.08.04
 */

// 标题配置
function title($title, $sep)
{
    global $paged, $page;
    if (is_feed()) {
        return $title;
    }
    $title .= get_bloginfo('name');
    $site_description = get_bloginfo('description', 'display');
    if ($site_description && (is_home() || is_front_page())) {
        $title = "{$title} {$sep} {$site_description}";
    }
    if ($paged >= 2 || $page >= 2) {
        $title = "{$title} {$sep} " . sprintf(__('第 %s 页', 'kratos'), max($paged, $page));
    }
    return $title;
}
add_filter('wp_title', 'title', 10, 2);

// Keywords 配置
function keywords()
{
    global $post;
    $keywords = '';
    if (is_home()) {
        $keywords = kratos_option('seo_keywords');
    } elseif (is_single()) {
        $keywords = get_post_meta($post->ID, "seo_keywords_value", true);
        if ($keywords == '') {
            $tags = wp_get_post_tags($post->ID);
            foreach ($tags as $tag) {
                $keywords = $keywords . $tag->name . ",";
            }
            $keywords = rtrim($keywords, ',');
        }
    } elseif (is_page()) {
        $keywords = get_post_meta($post->ID, "seo_keywords_value", true);
        if ($keywords == '') {
            $keywords = kratos_option('seo_keywords');
        }
    } else {
        $keywords = single_tag_title('', false);
    }
    return trim(strip_tags($keywords));
}

// Description 配置
function description()
{
    global $post;
    $description = '';
    if (is_home()) {
        $description = kratos_option('seo_description');
    } elseif (is_single()) {
        $description = get_post_meta($post->ID, "seo_description_value", true);
        if ($description == '') {
            $description = get_the_excerpt();
        }
        if ($description == '') {
            $description = str_replace("\n", "", mb_strimwidth(strip_tags($post->post_content), 0, 200, "…", 'utf-8'));
        }
    } elseif (is_category()) {
        $description = category_description();
    } elseif (is_tag()) {
        $description = tag_description();
    } elseif (is_page()) {
        $description = get_post_meta($post->ID, "seo_description_value", true);
        if ($description == '') {
            $description = kratos_option('seo_description');
        }
    }
    return trim(strip_tags($description));
}

// robots.txt 配置
add_filter('robots_txt', function ($output, $public) {
    if ('0' == $public) {
        return "User-agent: *\nDisallow: /\n";
    } else {
        if (!empty(kratos_option('seo_robots'))) {
            $output = esc_attr(strip_tags(kratos_option('seo_robots')));
        }
        return $output;
    }
}, 10, 2);

// 哀悼黑白站点：已迁移到 inc/theme-mourning.php
//
// 旧的 mourning() 只判 is_home() 且只能手动常开，无法按纪念日自动生效。
// 新实现挂在 wp_head（优先级 1），支持按日期自动判断，并保持向后兼容
// （旧的 g_rip 开关仍表示「一直黑白」）。

// 抓取图片链接（搜索引擎或者社交工具分享时抓取图片的链接）
/*
function share_thumbnail_url()
{
    global $post;
    if (has_post_thumbnail($post->ID)) {
        $post_thumbnail_id = get_post_thumbnail_id($post);
        $img = wp_get_attachment_image_src($post_thumbnail_id, 'full');
        $img = $img[0];
    } else {
        $content = $post->post_content;
        preg_match_all('/<img.*?(?: |\\t|\\r|\\n)?src=[\'"]?(.+?)[\'"]?(?:(?: |\\t|\\r|\\n)+.*?); ?>/sim', $content, $strResult, PREG_PATTERN_ORDER);
        if (!empty($strResult[1])) {
            $img = $strResult[1][0];
        } else {
            $img = kratos_option('seo_shareimg', ASSET_PATH . '/assets/img/default.jpg');
        }
    }
    return $img;
}
*/
// 支持上传 svg
add_filter('upload_mimes', 'upload_svg');
function upload_svg($existing_mimes = array())
{
    $existing_mimes['svg'] = 'image/svg+xml';
    return $existing_mimes;
}