Select Venue from dropdown list and reuse stored address information in meta_box

Question

UPDATED CODE 12/12/2011

Here is the code in functions.php. I put the code for output in my events page. For now there has been on output.

<?php
// Custom Meta Data for Events
   $meta_box['event'] = array(
    'id' => 'event-meta-details',
    'title' => 'Event Information',
    'context' => 'normal',
    'priority' => 'high',
    'fields' => array(
        array(
            'name' => 'Start Date',
            'desc' => '(Enter yyyy/mm/dd)',
            'id' => 'start_date',
            'type' => 'text',
            'default' => ''
        ),
        array(
        'name' => 'Venue',
        'desc' => 'Venue of Event',
        'id' => $prefix . 'event_venue',
        'type' => 'radio',
        'options' => array(
            array('name' => 'Spruce Gallery', 'value' => 'Spruce  Gallery'),
            array('name' => 'Pine Gallery', 'value' => 'Pine Gallery'),
            array('name' => 'Oak Gallery', 'value' => 'Oak Gallery')
        )
    )

    )
);


///////////////
 function get_related_event_data( $venue, $field = 'all' ) {
$event_data = array(
    'Spruce Gallery' => array(
        'address' => 'Test Address 1',
        'phone_no' => '344-333-2333',
        'url' => 'http://www.url1.com'
    ),
    'Pine Gallery' => array(
        'address' => 'Test Address 2',
        'phone_no' => '444-333-3333',
        'url' => 'http://www.url2.com'
    ),
    'Oak Gallery' => array(
        'address' => 'Test Address 3',
        'phone_no' => '555-666-6666',
        'url' => 'http://www.url3.com'
    ),
);
if( !isset( $event_data[$venue] ) )
    return;

// Optionally return all fields(note: you can't echo arrays, so be sure to loop over the data if pulling all fields
if( 'all' == $field )
    return $event_data[$venue];

if( !isset( $event_data[$venue][$field] ) )
    return;

return $event_data[$venue][$field];
}

///////////////

Here is the code I put on the page. I put in a test echo to make sure that the $venue was getting information and it is, but the address does not display.

<?php 

$venue = get_post_meta( $post->ID, 'event_venue', true );
echo $venue;

echo get_related_event_data( $venue, 'address' ); ?>

Old Post.

Here is the code that fills in my meta boxes.

 // Custom Meta Data for Events
   $meta_box['event'] = array(
    'id' => 'event-meta-details',
    'title' => 'Event Information',
    'context' => 'normal',
    'priority' => 'high',
    'fields' => array(
        array(
            'name' => 'Start Date',
            'desc' => '(Enter yyyy/mm/dd)',
            'id' => 'start_date',
            'type' => 'text',
            'default' => ''
        ),
        array(
        'name' => 'Venue',
        'desc' => 'Venue of Event',
        'id' => $prefix . 'event_venue',
        'type' => 'radio',
        'options' => array(
            array('name' => 'Spruce Gallery', 'value' => 'Spruce  Gallery', 'venue_url' => 'http://www.sprucegallery.com/'),
            array('name' => 'Pine Gallery', 'value' => 'Pine Gallery'),
            array('name' => 'Oak Gallery', 'value' => 'Oak Gallery')
        )
    )

    )
);

Here is the code for saving the information.

// Add meta boxes to admin panel only needs to be added once
add_action('admin_menu', 'plib_add_box');

//Add meta boxes to post types
function plib_add_box() {
    global $meta_box;

    foreach($meta_box as $post_type => $value) {
        add_meta_box($value['id'], $value['title'], 'plib_format_box', $post_type,  $value['context'], $value['priority']);
    }
}

//Format meta boxes
function plib_format_box() {
  global $meta_box, $post;

// Use once for verification
echo '<input type="hidden" name="plib_meta_box_nonce" value="',  wp_create_nonce(basename(__FILE__)), '" />';

echo '<table class="form-table">';

foreach ($meta_box[$post->post_type]['fields'] as $field) {
// get current post meta data
$meta = get_post_meta($post->ID, $field['id'], true);

      echo '<tr>'.
              '<th style="width:20%"><label for="'. $field['id'] .'">'. $field['name']. '</label></th>'.
              '<td>';
      switch ($field['type']) {
          case 'text':
              echo '<input type="text" name="'. $field['id']. '" id="'. $field['id'] .'" value="'. ($meta ? $meta : $field['default']) . '" size="30" style="width:30%" />'. ' - '. $field['desc'];
              break;
          case 'textarea':
              echo '<textarea name="'. $field['id']. '" id="'. $field['id']. '" cols="60" rows="4" style="width:97%">'. ($meta ? $meta : $field['default']) . '</textarea>'. '<br />'. $field['desc'];
              break;
          case 'select':
              echo '<select name="'. $field['id'] . '" id="'. $field['id'] . '">';
              foreach ($field['options'] as $option) {
                  echo '<option '. ( $meta == $option ? ' selected="selected"' : '' ) . '>'. $option . '</option>';
              }
              echo '</select>';
              break;
          case 'radio':
              foreach ($field['options'] as $option) {
                  echo '<input type="radio" name="' . $field['id'] . '" value="' . $option['value'] . '"' . ( $meta == $option['value'] ? ' checked="checked"' : '' ) . ' />' . $option['name'];
              }
              break;
          case 'checkbox':
              echo '<input type="checkbox" name="' . $field['id'] . '" id="' . $field['id'] . '"' . ( $meta ? ' checked="checked"' : '' ) . ' />';
              break;
      }
      echo     '<td>'.'</tr>';
  }

  echo '</table>';

}

// Save data from meta box
function plib_save_data($post_id) {
    global $meta_box,  $post;

    //Verify nonce
    if (!wp_verify_nonce($_POST['plib_meta_box_nonce'], basename(__FILE__))) {
        return $post_id;
    }

    //Check autosave
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
        return $post_id;
    }

    //Check permissions
    if ('page' == $_POST['post_type']) {
        if (!current_user_can('edit_page', $post_id)) {
            return $post_id;
        }
    } elseif (!current_user_can('edit_post', $post_id)) {
        return $post_id;
    }

    foreach ($meta_box[$post->post_type]['fields'] as $field) {
        $old = get_post_meta($post_id, $field['id'], true);
        $new = $_POST[$field['id']];

        if ($new && $new != $old) {
            update_post_meta($post_id, $field['id'], $new);
        } elseif ('' == $new && $old) {
            delete_post_meta($post_id, $field['id'], $old);
        }
    }
}

add_action('save_post', 'plib_save_data');

`I want to save and reuse multiple data points about multiple venues in an event CPT with meta boxes. I have the CPT and meta boxes that can save the event venue that I enter as well as times and dates. The goal is to have a drop down list of venues. When one of the venues is selected then the information for that venue - Address, URL, Phone #, etc. would be selected as well.

I planned to write out the information as an array but am not sure how to do that. Each time I try it doesn't work.

What is the best way to store multiple points of information without having to type them in each time? Worst case I will make a meta_key for each bit of information and enter it by hand, but that seems like pointless data entry. There must be a better way.

Thank you in advance.