1<?php
2$args = array( 'numberposts' => 5, 'orderby' => 'rand', 'post_status' => 'publish' );
3//numberposts 需要获取的文章数量
4// orderby 排序方式rand为随机获取
5//post_status=publish 只获取已经发布的文章！此参数千万不要修改，否则一些草稿及审核中的文章可能也会出现在随机查询的结果中。
6$rand_posts = get_posts( $args );

1<ul>
2<?php
3$args = array( 'numberposts' => 5, 'orderby' => 'rand', 'post_status' => 'publish' );
4$rand_posts = get_posts( $args );
5foreach( $rand_posts as $post ) : ?>
6    <li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
7<?php endforeach; ?>
8</ul>

 1<?php
 2//rand_post.php
 3class RandPost{
 4	private $arr=array(0,1,2,3,4,5);//用于控制随机输出顺序
 5	private $get_times=0; //只有首次使用wordpress的随机文章获取函数
 6	private $rand_array = array();
 7	
 8	public function get_rand_posts(){//随机获取的文章信息 与图片对应绑定
 9		
10		if ($this->get_times == 0){//只有第一次会进行绑定
11			//随机文章图片地址
12			$this ->rand_array['pic'][0]='https://www.xxx.com/1.jpg';
13			$this ->rand_array['pic'][1]='https://www.xxx.com/2.jpg';
14			$this ->rand_array['pic'][2]='https://www.xxx.com/3.jpg';
15			$this ->rand_array['pic'][3]='https://www.xxx.com/4.jpg';
16			$this ->rand_array['pic'][4]='https://www.xxx.com/5.jpg';
17			$this ->rand_array['pic'][5]='https://www.xxx.com/6.jpg';
18			$args = array( 'numberposts' => 6, 'orderby' => 'rand', 'post_status' => 'publish' );
19			// wordpress 函数获取随机文章
20			$rand_posts = get_posts( $args );
21			foreach( $rand_posts as $post ) {
22				//the_permalink(); 
23				//the_title(); 
24				$this ->rand_array['title'][]=$post->post_name;
25				$this ->rand_array['url'][]=$post ->guid;
26			};
27			++$this->get_times;
28		}
29	}
30	
31	public function show_rand_posts(){
32		$this ->get_rand_posts();// 获取文章 图片绑定关系
33		shuffle($this->arr); //随机打乱顺序
34		$post_arr = $this->rand_array;
35		$rand_num=array_pop($this->arr);//使用 array_pop 删除数组的最后一个元素
36		$rand_num>6?$rand_num=rand(0,5):'';// 默认每页6篇分页文章与 随机文章 
37		$rand_pic = $post_arr['pic'][$rand_num];
38		$rand_title = urldecode($post_arr['title'][$rand_num]);
39		$rand_url = $post_arr['url'][$rand_num];
40		echo '
41				<div style="position:relative;">
42				<a href="'.$rand_url.'"><img width="100%"  src="'.$rand_pic.'" style="width:100%;margin:10px auto;"/>
43				</a>
44				<div style="position:absolute;width:100%;z-indent:2;left:0;top:0;">
45				<span class=" rand_title"">  '.urldecode($rand_title).'</span>
46					</div>
47				</div>
48				';//调整文章显示及图片样式
49		
50	}
51	
52}
53/*
54$show = new RandPost();//循环显示文章前初始化
55$show ->show_rand_posts();//循环中获取随机文章图片展示
56}
57*/

 1<style>
 2 .rand_title {
 3    display: block;
 4    position: float;
 5    bottom: 0;
 6    width: 100%;
 7    box-sizing: border-box;
 8    color: #fff;
 9    padding: 4px 12px;
10    font-size: 16px;
11    line-height: 20px;
12    background: rgba(0,0,0,.4);
13    text-shadow: 0 0 3px rgba(0,0,0,.5);
14}
15 </style>

1wp-content/themes/主题文件名字/index.php   首页
2wp-content/themes/主题文件名字/archive.php   分类
3wp-content/themes/主题文件名字/search.php   搜索
4wp-content/themes/主题文件名字/tag.php   标签

1<?php 
2include('rand_post.php');
3$randshow = new RandPost();
4?>

1while ( have_posts() ) : the_post();
2 
3	$randshow ->show_rand_posts();// 这里是需要插入的语句
4	get_template_part( 'content','');
5 
6endwhile;