WordPress custom post types - functions.php

/**
 * CUSTOM POST TYPES
 */


// Registers the new post type and taxonomy

function txpbs_station_posttype() {
    register_post_type( 'txpbs_stations',
        array(
            'labels' => array(
                'name' => __( 'Member Stations' ),
                'singular_name' => __( 'Member Station' ),
                'add_new' => __( 'Add New Station' ),
                'add_new_item' => __( 'Add New Station' ),
                'edit_item' => __( 'Edit Station' ),
                'new_item' => __( 'Add New Station' ),
                'view_item' => __( 'View Station' ),
                'search_items' => __( 'Search Stations' ),
                'not_found' => __( 'No Stations found' ),
                'not_found_in_trash' => __( 'No stations found in trash' )
            ),
            'public' => true,
            'supports' => array( 'title', 'editor', 'thumbnail', 'comments' ),
            'capability_type' => 'post',
            'rewrite' => array("slug" => "stations"), // Permalinks format
            'menu_position' => 5,
            'register_meta_box_cb' => 'add_stations_metaboxes'
        )
    );
}
add_action( 'init', 'txpbs_station_posttype' );

// Add the Member Station Meta Boxes

function add_stations_metaboxes() {
    add_meta_box('txpbs_station_information', 'Station Information', 'txpbs_station_information', 'txpbs_stations', 'side', 'default');
}

// The Event Location Metabox

function txpbs_station_information() {
    global $post;

    // Noncename needed to verify where the data originated
    echo '<input type="hidden" name="stationmeta_noncename" id="stationmeta_noncename" value="' .
    wp_create_nonce( plugin_basename(__FILE__) ) . '" />';

    // Get the location data if its already been entered
    $callsign = get_post_meta($post->ID, '_callsign', true);
    $stationurl = get_post_meta($post->ID, '_stationurl', true);

    // Echo out the fields
    echo '<p>Enter the station call sign:</p>';
    echo '<input type="text" name="_callsign" value="' . $callsign  . '" class="widefat" />';
    echo '<p>Enter the station URL (website):</p>';
    echo '<input type="text" name="_stationurl" value="' . $stationurl  . '" class="widefat" />';

}

// Save the Metabox Data

function txpbs_save_events_meta($post_id, $post) {

    // verify this came from the our screen and with proper authorization,
    // because save_post can be triggered at other times
    if ( !wp_verify_nonce( $_POST['stationmeta_noncename'], plugin_basename(__FILE__) )) {
    return $post->ID;
    }

    // Is the user allowed to edit the post or page?
    if ( !current_user_can( 'edit_post', $post->ID ))
        return $post->ID;

    // OK, we're authenticated: we need to find and save the data
    // We'll put it into an array to make it easier to loop though.

    $station_meta['_callsign'] = $_POST['_callsign'];
    $station_meta['_stationurl'] = $_POST['_stationurl'];

    // Add values of $station_meta as custom fields

    foreach ($station_meta as $key => $value) { // Cycle through the $station_meta array!
        if( $post->post_type == 'revision' ) return; // Don't store custom data twice
        $value = implode(',', (array)$value); // If $value is an array, make it a CSV (unlikely)
        if(get_post_meta($post->ID, $key, FALSE)) { // If the custom field already has a value
            update_post_meta($post->ID, $key, $value);
        } else { // If the custom field doesn't have a value
            add_post_meta($post->ID, $key, $value);
        }
        if(!$value) delete_post_meta($post->ID, $key); // Delete if blank
    }

}

add_action('save_post', 'txpbs_save_events_meta', 1, 2); // save the custom fields