我在函数中有thtis函数。php文件

function post_manage_columns($column_name, $id) {
    global $post;
    switch ($column_name) {
        case \'Average\':
            echo get_post_meta( $post->ID , \'imdbRating\' , true );
            break;
        case \'Runtime\':
            echo get_post_meta( $post->ID , \'Runtime\' , true );
            break;
            case \'Poster\':
            $poster_path = "https://image.tmdb.org/t/p/w370_and_h556_bestv2".get_post_meta($post->ID, "poster_path", $single = true);
            echo \'<img width="53" height="80" src="\'.$poster_path.\'" />\';
            break;
        case \'years\':
            $terms = get_the_term_list( $post_id, \'years\', \'\', \',\', \'\' );
            if ( is_string( $terms ) ) {
                echo $terms;
            } else {
                _e( \'Unable to get year\', \'movietv\' );
            }
            break;
    } 
}
add_action(\'manage_post_posts_custom_column\', \'post_manage_columns\', 10, 2);

如果$poster\\u路径为空（或此字段没有post meta），我需要一些lik echo

    $poster_path = get_post_meta($post->ID, "poster_path", $single = true);           
    if( $poster_path == "" ){ 
    echo \'<img width="53" height="80" src="https://via.placeholder.com/370x556?text=No+Poster&000.jpg" />\'; 
    } else {
    echo \'<img width="53" height="80" src="https://image.tmdb.org/t/p/w370_and_h556_bestv2\'.$poster_path.\'" />\';
    }