typecho-matery-theme/functions.php

<?php
if (!defined('__TYPECHO_ROOT_DIR__')) exit;

/**
 * 获取文章缩略图
 * 获取顺序： 自定义字段（thumb）> 文章第一张图片 > 系统图库
 * @param $obj
 * @return 获取文章头图
 */
function get_postthumb($obj)
{

    if (isset($obj->fields->thumb)) {
        return $obj->fields->thumb;
    }

    preg_match("/<img[^>]+src\s*=\s*['\"]([^'\"]+)['\"][^>]*>/ ", $obj->content, $matches);
    if (isset($matches[1])) {
        return $matches[1];
    }

    preg_match("/!\[(.*?)\]\((.*?)\)/ ", $obj->content, $matches);
    if (isset($matches[2])) {
        return $matches[2];
    }

    $thumbPath = __DIR__ . '/static/medias/featureimages/';
    $files = scandir($thumbPath);
    $thumbs = [];
    for ($i = 0; $i < count($files); $i++) {
        if (is_file($thumbPath . $files[$i])) {
            $thumbs[] = $files[$i];
        }
    }

    return Helper::options()->themeUrl . '/static/medias/featureimages/' . $thumbs[rand(0, count($thumbs) - 1)];
}

/**
 * @param $obj 对象
 * @return string 上一页url
 */
function getPrevPageLink($obj)
{
    ob_start();
    $obj->pagelink("prev", "prev");
    $pageLink = ob_get_contents();
    ob_end_clean();
    preg_match("/<a[^>]+href\s*=\s*['\"]([^'\"]+)['\"][^>]*>/", $pageLink, $matches);
    if (isset($matches[1])) {
        return $matches[1];
    }
    return "#";
}

/**
 * @param $obj 对象
 * @return string 下一页url
 */
function getNextPageLink($obj)
{
    ob_start();
    $obj->pageLink("next", "next");
    $pageLink = ob_get_contents();
    ob_end_clean();
    preg_match("/<a[^>]+href\s*=\s*['\"]([^'\"]+)['\"][^>]*>/", $pageLink, $matches);
    if (isset($matches[1])) {
        return $matches[1];
    }
    return "#";
}

/**
 * 统计文章字数
 *
 * @param $cid
 */
function articleCount($cid)
{
    $db = Typecho_Db::get();
    $rs = $db->fetchRow($db->select('table.contents.text')->from('table.contents')->where('table.contents.cid=?', $cid)->order('table.contents.cid', Typecho_Db::SORT_ASC)->limit(1));
    $text = preg_replace("/[^\x{4e00}-\x{9fa5}]/u", "", $rs['text']);
    return mb_strlen($text, 'UTF-8');
}