Magento Customer Attribute Setup

customer-install-0.1.0.php

<?php
/* @var $installer Mage_Customer_Model_Resource_Setup  */
$installer = Mage::getResourceModel('customer/setup','customer_setup');

$installer->startSetup();
if (!$installer->getAttributeId('customer', 'attribute_name')) {
    $installer->addAttribute('customer', 'attribute_name', array(                                     // TABLE.COLUMN:                                       DESCRIPTION:
        /** Standard values defined @see Mage_Eav_Model_Entity_Setup::_prepareValues() */
        'label'                      => 'Label',                                                  // eav_attribute.frontend_label                        admin input label
        'backend'                    => 'module/class_name',                                      // eav_attribute.backend_model                         backend class (module/class_name format)
        'type'                       => 'varchar',                                                // eav_attribute.backend_type                          backend storage type (varchar, text etc)
        'table'                      => 'module/config_name',                                     // eav_attribute.backend_table                         backend table (resource config format)
        'frontend'                   => 'module/class_name',                                      // eav_attribute.frontend_model                        admin class (module/class_name format)
        'input'                      => 'input_name',                                             // eav_attribute.frontend_input                        admin input type (select, text, textarea etc)
        'frontend_class'             => null,                                                     // eav_attribute.frontend_type                         class associated to the element.
        'source'                     => null,                                                     // eav_attribute.source_model                          admin input source model (for selects) (module/class_name format)
        'required'                   => true,                                                     // eav_attribute.is_required                           required in admin
        'user_defined'               => false,                                                    // eav_attribute.is_user_defined                       editable in admin attributes section, false for not
        'default'                    => null,                                                     // eav_attribute.default_value                         admin input default value
        'unique'                     => false,                                                    // eav_attribute.is_unique                             unique value required
        'note'                       => null,                                                     // eav_attribute.note                                  admin input note (shows below input)
        'global'                     => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_GLOBAL,  // eav_attribute.is_global                             scope

        /** Unique values defined @see Mage_Customer_Model_Resource_Setup::_prepareValues() */
        'visible'                    => true,                                                     // customer_eav_attribute.is_visible                   visible on admin
        'system'                     => false,                                                    // customer_eav_attribute.is_system                    is system defined, should be false
        'input_filter'               => null,                                                     // customer_eav_attribute.input_filter                 field filter like datatime / date
        'multiline_count'            => 0,                                                        // customer_eav_attribute.multiline_count              multiline form field area line count
        'validate_rules'             => null,                                                     // customer_eav_attribute.validate_rules               serialised validation rules.
        'position'                   => 0,                                                        // customer_eav_attribute.sort_order                   position / sort order
    ));
}

/** For enterprise @see app/code/core/Enterprise/CustomerSegment/sql/enterprise_customersegment_setup/mysql4-upgrade-0.0.6-0.0.7.php */
$installer->updateAttribute('customer', 'created_at', 'is_used_for_customer_segment', 1);


/**
 * Set the customer attribute to be used in various forms.
 */
$attribute = $installer->getAttribute('customer', 'attribute_name');

$usedInForms = array(
    'customer_account_create',
    'customer_account_edit',
    'checkout_register',
    'adminhtml_customer'
);

$attribute->setData('used_in_forms', $usedInForms);
$attribute->save();

$installer->endSetup();