How to add a custom column in custom post type list in admin side wordpress

For add a custom column in admin side list for custom post type or any post type just copy and paste below code into your theme's functions.php


function rj_display_rank_column_data( $column, $post_id ) {
    global $wpdb;
    switch ( $column ) {

        case 'rank' :
                    $rank = get_post_meta($post_id,'optimus_rank_field',true);
               if($rank!='9999' && $rank!='')
               {
                echo $rank;
               }else
               {
                echo '-';
               }
            break;

    }
}
// add_action( 'manage_{custom_post_type}_posts_custom_column' , 'rj_display_rank_column_data', 10, 2 ); orignal hook
add_action( 'manage_portfolio_posts_custom_column' , 'rj_display_rank_column_data', 10, 2 );
function rj_add_rank_column( $columns ) {
   
        $columns['rank'] = __( 'Rank', 'enfold' );
        return $columns;
}
//add_filter( 'manage_{custom_post_type}_columns' , 'rj_add_rank_column' );  orignal hook
add_filter( 'manage_portfolio_columns' , 'rj_add_rank_column' ,20);