WordPress自动获取文章内视频作为封面的方法

将下方代码添加进functions即可实现：

//提取视频封面

function catch_video_image() {

global $post, $posts;

$video_image = '';

ob_start();

ob_end_clean();

$output = preg_match_all('/<video.+poster=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);

$video_image = $matches [1] [0];

return $video_image;

}

//正则提取字符串中视频url地址

function catch_that_video() {

global $post, $posts;

$first_video = '';

ob_start();

ob_end_clean();

$output = preg_match_all('/<video[^<>]*src=[\"]([^\"]+)[\"][^<>]*>/im', $post->post_content, $matches);

$first_video = $matches [1] [0];

return $first_video;

}