WordPress 修改后台编辑器上传视频的[video]短代码为video标签

WordPress 后台编辑器上传视频的时候是以 video 短代码返回到内容里的，这样子有些小程序没法识别，所以需要把短代码改成 video 标签。
将以下代码加入到主题的functions.php里：

<?php
remove_shortcode('video', 'wp_video_shortcode');
add_shortcode('video', 'MBT_video_shortcode');
function MBT_video_shortcode($attr, $content = '') {
    global $content_width;
    $post_id = get_post() ? get_the_ID() : 0;
    static $instance = 0;
    $instance++;
    $override = apply_filters('wp_video_shortcode_override', '', $attr, $content, $instance);
    if ('' !== $override) {
        return $override;
    }
    $video = null;
    $default_types = wp_get_video_extensions();
    $defaults_atts = array('src' => '', 'poster' => '', 'loop' => '', 'autoplay' => '', 'preload' => 'metadata', 'width' => 640, 'height' => 360,
    //'class' => 'wp-video-shortcode',
    );
    foreach ($default_types as $type) {
        $defaults_atts[$type] = '';
    }
    $atts = shortcode_atts($defaults_atts, $attr, 'video');
    if (is_admin()) {
        if ($atts['width'] > $defaults_atts['width']) {
            $atts['height'] = round(($atts['height'] * $defaults_atts['width']) / $atts['width']);
            $atts['width'] = $defaults_atts['width'];
        }
    } else {
        if (!empty($content_width) && $atts['width'] > $content_width) {
            $atts['height'] = round(($atts['height'] * $content_width) / $atts['width']);
            $atts['width'] = $content_width;
        }
    }
    $is_vimeo = $is_youtube = false;
    $yt_pattern = '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#';
    $vimeo_pattern = '#^https?://(.+\.)?vimeo\.com/.*#';
    $primary = false;
    if (!empty($atts['src'])) {
        $is_vimeo = (preg_match($vimeo_pattern, $atts['src']));
        $is_youtube = (preg_match($yt_pattern, $atts['src']));
        if (!$is_youtube && !$is_vimeo) {
            $type = wp_check_filetype($atts['src'], wp_get_mime_types());
            if (!in_array(strtolower($type['ext']), $default_types)) {
                return sprintf('<a class="wp-embedded-video" href="%s">%s</a>', esc_url($atts['src']), esc_html($atts['src']));
            }
        }
        if ($is_vimeo) {
            wp_enqueue_script('mediaelement-vimeo');
        }
        $primary = true;
        array_unshift($default_types, 'src');
    } else {
        foreach ($default_types as $ext) {
            if (!empty($atts[$ext])) {
                $type = wp_check_filetype($atts[$ext], wp_get_mime_types());
                if (strtolower($type['ext']) === $ext) {
                    $primary = true;
                }
            }
        }
    }
    if (!$primary) {
        $videos = get_attached_media('video', $post_id);
        if (empty($videos)) {
            return;
        }
        $video = reset($videos);
        $atts['src'] = wp_get_attachment_url($video->ID);
        if (empty($atts['src'])) {
            return;
        }
        array_unshift($default_types, 'src');
    }
    $library = apply_filters('wp_video_shortcode_library', 'mediaelement');
    if ('mediaelement' === $library && did_action('init')) {
        wp_enqueue_style('wp-mediaelement');
        wp_enqueue_script('wp-mediaelement');
        wp_enqueue_script('mediaelement-vimeo');
    }
    if ('mediaelement' === $library) {
        if ($is_youtube) {
            $atts['src'] = remove_query_arg('feature', $atts['src']);
            $atts['src'] = set_url_scheme($atts['src'], 'https');
        } elseif ($is_vimeo) {
            $parsed_vimeo_url = wp_parse_url($atts['src']);
            $vimeo_src = 'https://' . $parsed_vimeo_url['host'] . $parsed_vimeo_url['path'];
            $loop = $atts['loop'] ? '1' : '0';
            $atts['src'] = add_query_arg('loop', $loop, $vimeo_src);
        }
    }
    $atts['class'] = apply_filters('wp_video_shortcode_class', $atts['class'], $atts);
    $html_atts = array(
    //'class' => $atts['class'],
    //'id' => sprintf( 'video-%d-%d', $post_id, $instance ),
    //'width' => absint( $atts['width'] ),
    //'height' => absint( $atts['height'] ),
    'poster' => esc_url($atts['poster']), 'loop' => wp_validate_boolean($atts['loop']), 'autoplay' => wp_validate_boolean($atts['autoplay']),
    //'preload' => $atts['preload'],
    );
    foreach (array('poster', 'loop', 'autoplay', 'preload') as $a) {
        if (empty($html_atts[$a])) {
            unset($html_atts[$a]);
        }
    }
    $attr_strings = array();
    foreach ($html_atts as $k => $v) {
        $attr_strings[] = $k . '="' . esc_attr($v) . '"';
    }
    $html = '';
    $fileurl = '';
    foreach ($default_types as $fallback) {
        if (!empty($atts[$fallback])) {
            if (empty($fileurl)) {
                $fileurl = $atts[$fallback];
            }
            if ('src' === $fallback && $is_youtube) {
                $type = array('type' => 'video/youtube');
            } elseif ('src' === $fallback && $is_vimeo) {
                $type = array('type' => 'video/vimeo');
            } else {
                $type = wp_check_filetype($atts[$fallback], wp_get_mime_types());
            }
            $url = add_query_arg('_', $instance, $atts[$fallback]);
        }
    }
    $html.= sprintf('<video %s src="' . esc_url($url) . '" controls="controls">', join(' ', $attr_strings));
    $html.= '</video>';
    $width_rule = '';
    if (!empty($atts['width'])) {
        $width_rule = sprintf('width: %dpx;', $atts['width']);
    }
    //$output = sprintf( '<div style="%s" class="wp-video">%s</div>', $width_rule, $html );
    $output = $html;
    return apply_filters('MBT_video_shortcode', $output, $atts, $video, $post_id, $library);
}