我有一个plugin that does this manually 在通过ajax的批处理过程中，我收到了很多关于如何使其自动化的请求。
这是加载帖子、将图像下载到上传目录并将其附加到帖子的功能。然后，它会搜索并替换旧的img URL，并将其替换为新的。将此附加到所有发布操作，您就可以开始了。
/**
* Extracts all images in content adds to media library
* if external and updates content with new url
*
* @param object $post The post object
*
*/
function prefix_extract_external_images( $post ) {
if ( ! is_object( $post ) ) {
$post = get_post( $post );
}
$html = $post->post_content;
$path = wp_upload_dir();
$path = $path[\'baseurl\'];
if ( stripos( $html, \'<img\' ) !== false ) {
$regex = \'#<\\s*img [^\\>]*src\\s*=\\s*(["\\\'])(.*?)\\1#im\';
preg_match_all( $regex, $html, $matches );
if ( is_array( $matches ) && ! empty( $matches ) ) {
$new = array();
$old = array();
foreach ( $matches[2] as $img ) {
// Compare image source against upload directory
// to prevent adding same attachment multiple times
if ( stripos( $img, $path ) !== false ) {
continue;
}
$tmp = download_url( $img );
preg_match(
\'/[^\\?]+\\.(jpg|JPG|jpe|JPE|jpeg|JPEG|gif|GIF|png|PNG)/\', $img, $matches
);
$file_array[\'name\'] = basename( $matches[0] );
$file_array[\'tmp_name\'] = $tmp;
// If error storing temporarily, unlink
if ( is_wp_error( $tmp ) ) {
@unlink( $file_array[\'tmp_name\'] );
$file_array[\'tmp_name\'] = \'\';
continue;
}
$id = media_handle_sideload( $file_array, $post->ID );
if ( ! is_wp_error( $id ) ) {
$url = wp_get_attachment_url( $id );
array_push( $new, $url );
array_push( $old, $img );
}
} // end foreach
if ( ! empty( $new ) ) {
$content = str_ireplace( $old, $new, $html );
$post_args = array( \'ID\' => $post->ID, \'post_content\' => $content, );
if ( ! empty( $content ) ) {
$post_id = wp_update_post( $post_args );
}
}
} // end if ( is_array( $matches ) && ! empty( $matches ) )
} // end if ( stripos( $html, \'<img\' ) !== false )
return $post;
} // end function
$action_arrays = array( \'new_to_publish\', \'pending_to_publish\', \'draft_to_publish\' );
foreach ( $action_array as $action ) {
add_action( $action, \'prefix_extract_external_images\' );
}
奖励：将找到的第一个图像设置为特色图像。
将此项添加到return $post 在上述函数中。
$atts = get_first_attachment( $post->ID );
foreach ( $atts as $a ) {
$img = set_post_thumbnail( $post->ID, $a[\'ID\'] );
}
上述代码也需要此功能。
/**
* Queries for attached images
* @param int $post_id The post id to check if attachments exist
* @return array|bool The 1st attached on success false if no attachments
*/
function get_first_attachment( $post_id ) {
return get_children( array (
\'post_parent\' => $post_id,
\'post_type\' => \'attachment\',
\'post_mime_type\' => \'image\',
\'posts_per_page\' => (int)1
), ARRAY_A );
}
