function.phpの最後に以下の記述を追加しました。
/**
* ダッシュボードの投稿一覧画面にアイキャッチを表示
*/
function add_thumbnail_column( $columns ) {
$post_type = isset( $_REQUEST[‘post_type’] ) ? $_REQUEST[‘post_type’] : ‘post’;
if ( post_type_supports( $post_type, ‘thumbnail’ )) {
$columns[‘thumbnail’] = __( ‘Featured Images’ );
}
return $columns;
}
function display_thumbnail_column( $column_name, $post_id ) {
if ( $column_name == ‘thumbnail’ ) {
if ( has_post_thumbnail( $post_id )) {
echo get_the_post_thumbnail( $post_id, array( 50, 50 ));
} else {
_e( ‘none’ );
}
}
}
add_filter( ‘manage_posts_columns’, ‘add_thumbnail_column’ );
add_action( ‘manage_posts_custom_column’, ‘display_thumbnail_column’, 10, 2 );
