记录一下修改文章略缩图

原因是我不喜欢每次填写自定义文章缩略图的图片地址
就去网上找了随机播放的代码
记录一下
找到主题的post_header.php文件
修改

<header id="page-header" class="post-bg" style="background-image: url()>

为以下

<header id="page-header" class="post-bg" style="background-image: url(<?php srand( microtime() * 1000000 ); 
    $num = rand( 1, 8 ); 
    switch( $num ) 
    {
    case 1: $image_file = "/img/1.webp"; break; 
    case 2: $image_file = "/img/2.webp"; break; 
    case 3: $image_file = "/img/3.webp"; break; 
    case 4: $image_file = "/img/4.webp"; break; 
    case 5: $image_file = "/img/5.webp"; break; 
    case 6: $image_file = "/img/6.webp"; break; 
    case 7: $image_file = "/img/7.webp"; break; 
    case 8: $image_file = "/img/8.webp"; break; 
    } 
 echo "$image_file"; ?>)">