I'm trying to apply some text to the "Featured Image" box. It works fine for a custom post type, but I can't get a specific piece of text appearing on pages rather than posts.

add_filter( 'admin_post_thumbnail_html', 'foo' );
function foo( $content ) {
    global $post_type;
    if ( $post_type = 'page') {
        $content = '<p>foobar</p>' . $content;
     }
    else{
        $content = '<p>barfoo</p>' . $content;
     }
     return $content;
}

How can I get WordPress to identify if it is just a page?

I'm trying to apply some text to the "Featured Image" box. It works fine for a custom post type, but I can't get a specific piece of text appearing on pages rather than posts.

add_filter( 'admin_post_thumbnail_html', 'foo' );
function foo( $content ) {
    global $post_type;
    if ( $post_type = 'page') {
        $content = '<p>foobar</p>' . $content;
     }
    else{
        $content = '<p>barfoo</p>' . $content;
     }
     return $content;
}

How can I get WordPress to identify if it is just a page?

• filters
• post-thumbnails
• post-type

• 1 You're missing an = sign in the if statement. – WebElaine Commented Oct 21, 2019 at 13:59
• I am indeed - thanks very much! – JohnG Commented Oct 24, 2019 at 9:17

1 Answer 1

By using post id you can get post type of current post/page. try below code. i have tested and it is working fine for me.

add_filter( 'admin_post_thumbnail_html', 'foo',10,3 );
function foo( $content, $post_id, $thumbnail_id ) {
   if ( get_post_type( $post_id ) == 'page' ) {
        $content = '<p>foobar</p>' . $content;
     }
    else{
        $content = '<p>barfoo</p>' . $content;
     }
     return $content;
}

Let me know if this works for you!