function image_field_update_instance

Implements hook_field_update_instance().

File

modules/image/image.module, line 501

Code

function image_field_update_instance($instance, $prior_instance) {
    // Only act on image fields.
    $field = field_read_field($instance['field_name']);
    if ($field['type'] != 'image') {
        return;
    }
    // The value of a managed_file element can be an array if the #extended
    // property is set to TRUE.
    $fid_new = $instance['settings']['default_image'];
    if (is_array($fid_new)) {
        $fid_new = $fid_new['fid'];
    }
    $fid_old = $prior_instance['settings']['default_image'];
    if (is_array($fid_old)) {
        $fid_old = $fid_old['fid'];
    }
    // If the old and new files do not match, update the default accordingly.
    $file_new = $fid_new ? file_load($fid_new) : FALSE;
    if ($fid_new != $fid_old) {
        // Save the new file, if present.
        if ($file_new) {
            $file_new->status = FILE_STATUS_PERMANENT;
            file_save($file_new);
            file_usage_add($file_new, 'image', 'default_image', $instance['id']);
        }
        // Delete the old file, if present.
        if ($fid_old && ($file_old = file_load($fid_old))) {
            file_usage_delete($file_old, 'image', 'default_image', $instance['id']);
        }
    }
    // If the upload destination changed, then move the file.
    if ($file_new && file_uri_scheme($file_new->uri) != $field['settings']['uri_scheme']) {
        $directory = $field['settings']['uri_scheme'] . '://default_images/';
        file_prepare_directory($directory, FILE_CREATE_DIRECTORY);
        file_move($file_new, $directory . $file_new->filename);
    }
}