php - Drupal Field API - Settings List -

i'm trying create 'link_field' in drupal through module, i've got following code i'd configure field settings following:

• not require title
• update number of values unlimited

i'm struggling find information around setting key/pair values can pass through these, able offer guidance on these?

    <?php /**  * implements hook_enable().  *  * create field. fields can created without needs attach them  * entities.  */ function youtube_carousel_enable() {   $field = array(     'field_name' => 'ytcarousel_field',     'type' => 'link_field',   );   field_create_field($field);     /**   * bind field entity bundle.   */   $instance = array(     'field_name' => $field['field_name'],     'entity_type' => 'node',     'bundle' => 'homepage',     'label' => 'youtube video'   );   field_create_instance($instance); }  /**  * implements hook_disable().  *  * remove field node bundle (content type) , delete field.  */ function youtube_carousel_disable() {   $instance = array(     'field_name' => 'ytcarousel_field',     'entity_type' => 'node',     'bundle' => 'homepage',     'label' => 'youtube video'   );   field_delete_instance($instance);   field_delete_field($instance['field_name']);   print 'removed ' . $instance['field_name'] . "\n"; } ?> 

cheers

after viewing html source key/value pairs i've managed similar above following code:

<?php /**  * implements hook_enable().  *  * create field. fields can created without needs attach them  * entities.  */ function youtube_carousel_enable() {   $field = array(     'field_name' => 'ytcarousel_field',     'type' => 'link_field',     'cardinality' => -1   );   field_create_field($field);     /**   * bind field entity bundle.   */   $instance = array(     'field_name' => $field['field_name'],     'entity_type' => 'node',     'bundle' => 'homepage',     'label' => 'youtube video',     'settings' => array('title' => 'required')   );   field_create_instance($instance); }  /**  * implements hook_disable().  *  * remove field node bundle (content type) , delete field.  */ function youtube_carousel_disable() {   $instance = array(     'field_name' => 'ytcarousel_field',     'entity_type' => 'node',     'bundle' => 'homepage',     'label' => 'youtube video',     'settings' => array('title' => 'required')   );   field_delete_instance($instance);   field_delete_field($instance['field_name']);   print 'removed ' . $instance['field_name'] . "\n"; } ?> 

the cardinality controls have many instances value can have, "-1" unlimited.

'cardinality' => -1 

the title attribute controlled via instance not field itself, believe, , uses text based values rather numeric.

'settings' => array('title' => 'required')