在drupal7中动态的为某个内容类型添加字段

 $myField_name = "my_new_field_name";

    if(!field_info_field($myField_name)) // check if the field already exists.

    {

        $field = array(

            'field_name'    => $myField_name,

            'type'          => 'image',

        );

        field_create_field($field);



        $field_instance = array(

            'field_name'    => $myField_name,

            'entity_type'   => 'node',

            'bundle'        => 'CONTENT_TYPE_NAME',

            'label'         => t('Select an image'),

            'description'   => t(''),

            'widget'        => array(

                'type'      => 'image_image',

                'weight'    => 10,

            ),

            'formatter'     => array(

                'label'     => t('label'),

                'format'    => 'image'

            ),

            'settings'      => array(

                'file_directory'        => 'photos', // save inside "public://photos"

                'max_filesize'          => '4M',

                'preview_image_style'   => 'thumbnail',

                'title_field'           => TRUE,

                'alt_field'             => FALSE,

            )

        );

        field_create_instance($field_instance);

        drupal_set_message("Field created successfully!");

    }