另一种方法是使用WordPress的内置自动嵌入，core中的以下行负责自动嵌入：

add_filter( \'the_content\', array(&$this, \'autoembed\'), 8 ); 

您可以在此之前添加自定义过滤器以添加youtube url，如下所示：

add_filter( \'the_content\', \'prefix_add_youtube_videos\', 7 );
function prefix_add_youtube_videos( $content ) {
    $video = get_post_meta( get_the_ID(), \'video_url\', true );
    if ( ! empty( $video ) ) {
        $content .= $video;
    }

    return $content;
}

PS嵌入很好！不要freeboot!

如果您有任何PHP方面的经验，甚至是基本经验，那么可以直接进行设置。

看看explode 和substr.

<?php

  // explode() will split the string up into an array, for ex:
  $youtube_url = \'https://www.youtube.com/watch?v=dQw4w9WgXcQ\';
  $youtube_array = explode(\'?v=\', $youtube_url);

  // we used \'?v=\' as the delimter, so explode will create an array of two parts, the first being everything before the delimiter and the second being everything after (the YouTube ID)

        print_r($youtube_array);
        // will print: Array ( [0] => https://www.youtube.com/watch [1] => dQw4w9WgXcQ )

        echo $youtube_array[1];
        // will echo: dQw4w9WgXcQ
?>

<?php

  // lets use a more complicated link
  $youtube_url = \'https://www.youtube.com/watch?v=dQw4w9WgXcQ&list=RDdQw4w9WgXcQ#t=0\';
  $youtube_array = explode(\'?v=\', $youtube_url);

        print_r($youtube_array);
        // will print: Array ( [0] => https://www.youtube.com/watch [1] => dQw4w9WgXcQ&list=RDdQw4w9WgXcQ#t=0 )

        echo $youtube_array[1];
        // will echo: dQw4w9WgXcQ&list=RDdQw4w9WgXcQ#t=0

        // we can use substr() to pull out just the id by cuting it down to the first 11 characters of the string, all YouTube IDs are 11 characters
        $youtube_id = substr($youtube_array[1], 0, 11);

        echo $youtube_id;
        // will echo: dQw4w9WgXcQ
?>  

您可以在模板中直接使用它，也可以将其与某种类型的操作或过滤器挂钩一起使用

wp_oembed_get( get_post_meta( get_the_ID(), \'video_url\', true ) );

我使用正则表达式匹配并从url返回youtube视频id：

<?php    
  /**
   * Match non-linked youtube URL in the wild.
   * : Regex Overview/Pseudo-code :
   * 
   * Required scheme. Either http or https.
   * Optional subdomain.
   * Group host alternatives.
   * Either youtu.be
   * or youtube.com 
   * or youtube-nocookie.com
   * followed by
   * Allow anything up to VIDEO_ID,
   * but char before ID is non-ID char.
   * End host alternatives.
   * $1: VIDEO_ID is exactly 11 chars.
   * Assert next char is non-ID or EOS.
   * Assert URL is not pre-linked.
   * Allow URL (query) remainder.
   * Group pre-linked alternatives.
   * Either inside a start tag,
   * or inside <a> element text contents.
   * End recognized pre-linked alts.
   * End negative lookahead assertion.
   * Consume any URL (query) remainder.
   */

function getYoutubeVideoID ( $youtube_url ) {

  return preg_replace(\'~https?://(?:[0-9A-Z-]+\\.)?(?:youtu\\.be/| youtube(?:-nocookie)?\\.com\\S*[^\\w\\s-])([\\w-]{11})(?=[^\\w-]|$)(?![?=&+%\\w.-]*(?:[\\\'"][^<>]*>| </a>))[?=&+%\\w.-]*~ix\', \'$1\', $youtube_url);

}

// example urls
$this_video_url = \'https://youtu.be/RVWtSsMUBD0\';
$this_video_url = \'https://www.youtube.com/watch?v=RVWtSsMUBD0\';

$this_youtube_id = getYoutubeVideoID( $this_video_url );
echo \'YouTube ID: \' . $this_youtube_id;