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numberposts doesn't exist for WP_Query instead use "posts_per_page" => 1


Here's one way to inject the custom field as the featured image caption with help of the post_thumbnail_html filter: add_filter( 'post_thumbnail_html', function( $html, $post_id ) { if( $html && $caption = get_post_meta( $post_id, 'wpcf-bildunterschrift', true ) ) $html .= sprintf( '<p>%s</p>', esc_html( $caption ) ); ...


When you are concatenating string you shouldn't use ;after the method. Also you should close que quotes, call the method, and open again. Try the code below: $listItem .= '<div id="agenda-block-image-responsive" style="' .get_field('speaker-img' ) . '">';

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