add the post as canonical for attachment page wordpress

Question

add the post as canonical for attachment page wordpress

vyperlook

2020年3月10日 03:45

the attachment page should have canonical added to the main post

on attachment page (image.php) I currently have (automatically added by All in One Seo Pack):

link rel="canonical" href="https://example.com/main-post/image-name" /

And I want to change it to point to the post (where this image is attached)

link rel="canonical" href="https://example.com/main-post" /

You can ignore All in One Seo Pack if that is difficutl to change, and maybe simple provide a way to add the canonical to the main post.

Topic rel-canonical attachments images plugin-all-in-one-seo seo Wordpress

Category Web

birgire · Accepted Answer · 2017年6月28日 11:24

Here's an (untested) example where we inject into the header tag on attachment's pages, the canonical link of the attached post:

add_action( 'wp_head', 'wpse_attachment_parent_canonical' );

function wpse_attachment_parent_canonical()
{
    // Only target attachment's pages
    if( ! is_attachment() )
        return;

    $object = get_queried_object();

    // Make sure we're dealing with a WP_Post object
    if ( ! is_a( $object, '\WP_Post' ) )
        return;

    // Only target attachments that are attached to posts
    if( 0 == $object->post_parent )
        return;

    // Output canonical link
    printf(
        '<link rel="canonical" href="%s" />' . PHP_EOL,
        esc_url( get_permalink( $object->post_parent ) )
    );
}

Note that we can't use the get_canonical_url filter here to adjust the canonical url, as it's only applied to objects with publish post status. Attachments have inherit post status.

add the post as canonical for attachment page wordpress

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