Wordpress: custom admin columns sorting

wp-custom-admin-columns.php

<?php
/**
 * custom admin columns for custom-post-type , and sorting
 * 
 * custom_post_type: enter cutom post type as function name
 * custom-post-type: enter your custom post here
 * custom_column: enter your custom colum id
 * custom_column1: enter your custom colum id
 * CustomColumnName: enter your custom column name
 * custom_meta: enter custom meta
 */
//add item in header
add_filter('manage_custom-post-type_posts_columns', 'custom_post_type_admin_column_head');
function custom_post_type_admin_column_head( $defaults ) {
    //add column names to the defaults array dupicate below line for more column
    $defaults['custom_column']  = 'CustomColumnName';
    $defaults['custom_column1']  = 'CustomColumnName1';
    return $defaults;
}

//add column
add_action( 'manage_custom-post-type_posts_custom_column', 'custom_post_type_admin_columns', 10, 2 );
function custom_post_type_admin_columns( $column_name, $post_id ) {

    //add colums to admin duplicate the below if loop for more itemscolumns
    if ($column_name == 'custom_column') {
        $custom_column = get_post_meta( $post_id, 'custom_meta', true );
            echo  date( _x( 'F d, Y', 'CustomColumnName', 'textdomain' ), strtotime( $custom_column ) ); //date
    }
    if ($column_name1 == 'custom_column') {
        $custom_column1 = get_post_meta( $post_id, 'custom_meta', true );
            echo  $custom_column1; //another value
    }
}

//make colunm sortable
add_filter( 'manage_edit-custom-post-type_sortable_columns', 'custom_post_type_admin_column_sorting' );
function custom_post_type_admin_column_sorting( $columns ) {
    //add column names sortable add items to the columns array dupicate below line for more column
    $columns['custom_column']  = 'custom_column';
    $columns['custom_column1']  = 'custom_column1';
    return $columns;
}

//make columns sortable duplicate the below filter if there is more custom columns
add_filter( 'request', 'custom_column_column_orderby' );
function custom_column_column_orderby( $vars ) {
    if ( isset( $vars['orderby'] ) && 'custom_column' == $vars['orderby'] ) {
        $vars = array_merge( $vars, array(
            'meta_key' => 'custom_meta',
            'orderby' => 'meta_value'
        ) );
    }

    return $vars;
}

add_filter( 'request', 'custom_column1_column_orderby' );
function custom_column1_column_orderby( $vars ) {
    if ( isset( $vars['orderby'] ) && 'custom_column' == $vars['orderby'] ) {
        $vars = array_merge( $vars, array(
            'meta_key' => 'custom_meta',
            'orderby' => 'meta_value'
        ) );
    }

    return $vars;
}

?>