laravel-blog/app/Http/Controllers/Home/Blog/ArticleController.php

<?php

namespace App\Http\Controllers\Home\Blog;

use App\Models\Blog\Article;
use App\Models\Blog\ArticleTag;
use App\Models\Blog\Category;
use App\Models\Blog\Tag;
use DOMDocument;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Auth;

class ArticleController extends CommonController
{
    //
    public function index(Request $request)
    {
        $size = 20;
        $data = Article::with('category:id,cate_name')
            ->select( 'cate_id', 'slug', 'title', 'read_count', 'created_at', 'is_top', 'description')
            ->orderByDesc('is_top')->orderByDesc('created_at');


        if (isset($request->id)) {
            $data = $data->where('id', '=', $request->id);
        }
        if (isset($request->name)) {
            $data = $data->where('name', 'like', '%' . $request->name . '%');
        }
        if (isset($request->start_at) && isset($request->end_at)) {
            $data = $data->whereBetween('created_at', array($request->start_at, $request->end_at));
        }
        $data = $data->paginate($size)->toArray();
        $this->sidebar($data);

        return view('home.index', $data);
    }

    public function show($slug)
    {
        $article = Article::with('category:id,cate_name')
            ->select( 'id', 'cate_id', 'slug', 'title', 'read_count', 'created_at', 'is_top', 'description', 'markdown', 'keywords')
            ->where('slug', '=', $slug)->first();


        if (!$article) {
            return view('errors.404');
        }

        $article->increment("read_count");

        $tags = ArticleTag::query()
            ->select('blog_tags.tag_name')
            ->where('article_id', '=', $article->id)
            ->leftJoin('blog_tags', 'blog_article_tags.tag_id', 'blog_tags.id')
            ->get();

        $article = $article->toArray();
//        $article['markdown'] = markdown($article['markdown']);
        $article['markdown'] = $this->lazyImageMarkdown(markdown($article['markdown']));

        $data['article'] = $article;
        $data['article']['tags'] = $tags->toArray();
        $data['guess_you_like_articles'] = $this->guessYouLikeArticles($article['cate_id'], $slug);

        $this->sidebar($data);

        $keywords = '';

        foreach ($data['article']['tags'] as $i => $tag) {
            if ($i == 0) $keywords .= $tag['tag_name'];
            else $keywords .= ','.$tag['tag_name'];
        }

        $data['meta']['title'] = $article['title'];
        $data['meta']['description'] = $article['description'];
        $data['meta']['keywords'] = $keywords;

        return view('home.blog.article.index', $data);
    }

    /* guess you like*/
    protected function guessYouLikeArticles($cate_id, $slug)
    {
        $articles = Article::query()
            ->select('slug', 'title', 'read_count', 'description')
            ->where('cate_id', '=', $cate_id)
            ->where('slug', '!=', $slug)
            ->inRandomOrder()
            ->limit(8)->get();

        return $this->parseToArray($articles);
    }

    protected function lazyImageMarkdown($markdown)
    {
        $dom = new DomDocument();
        $dom->loadHTML('<?xml encoding="UTF-8">'.$markdown);

        $list = $dom->getElementsByTagName('img');
        foreach($list as $i => $item){
            if ($i == 0) continue;
            $attr_src = $item->getAttribute('src');
            $item->setAttribute("data-original", $attr_src);
            $item->setAttribute("src", "data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%201%201'%3E%3C/svg%3E");
//            $item->removeAttribute('src');
            $item->setAttribute('class', 'lazyload');
        }

        $html = $dom->saveHTML();
        return $html;
    }

}