Wordpress Add Custom Columns

add_custom_columns.php

/**
        * Add a Custom Column in Posts and Custom Post Types Admin Screen
        * http://code.tutsplus.com/articles/add-a-custom-column-in-posts-and-custom-post-types-admin-screen--wp-24934
*/




/**
        * Custom Post Type Snippets to make you smile
        * https://yoast.com/custom-post-type-snippets/
        * Change the Software screen columns edit.php
 */

add_filter( "manage_software_posts_columns", "change_columns" );
function change_columns( $cols ) {
  $cols = array(
    'cb'       => '<input type="checkbox" />',
    'featured_image'      => __( '', 'trans' ),
    'title' => __( 'Title', 'trans' ),
    'software_categories'     => __( 'Categories', 'trans' ),
     'software_platform'     => __( 'Platform', 'trans' ),
      'software_audience'     => __( 'Audience', 'trans' ),
     'status'     => __( 'Status', 'trans' ),
     'date'     => __( 'Date', 'trans' ),
  );
  return $cols;
}

/**
        * Add a Custom Column in Posts and Custom Post Types Admin Screen
        * http://code.tutsplus.com/articles/add-a-custom-column-in-posts-and-custom-post-types-admin-screen--wp-24934
*/
// GET FEATURED IMAGE
function ud_get_featured_image($post_ID) {
    $post_thumbnail_id = get_post_thumbnail_id($post_ID);
    if ($post_thumbnail_id) {
        $post_thumbnail_img = wp_get_attachment_image_src($post_thumbnail_id, 'featured_preview');
        return $post_thumbnail_img[0];
    }
}
// Display column content
add_action( "manage_posts_custom_column", "ud_software_custom_columns", 10, 2 );

function ud_software_custom_columns( $column, $post_id ) {
    switch ( $column ) {
        case "featured_image":
            $featured_image = ud_get_featured_image($post_ID);
            if($featured_image) {
                echo '<img width="30" height="37" src="' . $featured_image . '">';
            }
            else {
                echo '<img width="30" height="30" src="' .get_stylesheet_directory_uri(). '/images/icon-default.png">';
            }
        break;

        case "title":
            $title = get_post_meta( $post_id, 'title', true);
            echo '<a href="' . $title . '">' . $title. '</a>';
        break;

        case "status":
            $show_custom_state = get_post_meta( $post_id, '_status', true);
            if(!empty ($show_custom_state)){
                echo '<span class="custom_state ' . strtolower( $show_custom_state ) . '">' . $show_custom_state . '</span>';
                /**
                 *wp_set_object terms won't remove all terms
                 * http://wordpress.stackexchange.com/questions/29750/wp-set-object-terms-wont-remove-all-terms
                 * Clear Categorie is status is inactive
                 */
                 wp_set_object_terms( $post_id, NULL, 'software_categories' );
            }
            else {
                echo '<span class="custom_state_none">Active</span>';
            }
            //echo get_post_meta( $post_id, '_status', true);
        break;

        case "software_categories":
            $terms_categories = get_the_terms($post->ID, 'software_categories', true);
            if(!empty ($terms_categories)) {
                foreach ( $terms_categories as $term ) {
                    $term_categories_link = get_term_link( $term, 'software_categories' );
                    echo '<a href="'. $term_categories_link.'">' .$term->name .'</a>';
                }
            }
        break;

        case "software_platform":
            $terms_platform = get_the_terms($post->ID, 'software_platform', true);
            if(!empty ($terms_platform)) {
                foreach ( $terms_platform as $term ) {
                    $term_platform_link = get_term_link( $term, 'software_platform' );
                    $out[] = '<a href="'. $term_platform_link.'">' .$term->name .'</a>';
                }
                echo join( ', ', $out );
            }
        break;

        case "software_audience":
            $terms_audience = get_the_terms($post->ID, 'software_audience', true);
            if(!empty ($terms_audience)) {
                foreach ( $terms_audience as $term ) {
                    $term_audience_link = get_term_link( $term, 'software_audience' );
                    $out[] = '<a href="'. $term_audience_link.'">' .$term->name .'</a>';
                }
                echo join( ', ', $out );
            }
        break;

        case "date":
            echo the_date( $post_id);
        break;
    }
}