Programmatically creating/deleting/modifying field-collection
Enough Said , visit the link: http://rajanmayekar.com/blog/programmatically-creating-deleting-modifying-field-collection-item-node
One change wrt to deleting Field Collections is as follows:
<?php
$node = node_load($node_id);
$field_collection_item_value = array();
foreach ($node->field_collection_field[LANGUAGE_NONE] as $key => $value) {
$field_collection_item_value[] = $value['value'];
}
entity_delete_multiple('field_collection_item', array($field_collection_item_value));
?>