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<?php
# Bootstrap
set_include_path(dirname(__FILE__) . PATH_SEPARATOR . get_include_path());

require 'app/Mage.php';
$app = Mage::app('', 'store');

$couponsCollection = Mage::getModel('salesrule/coupon')->getCollection();
Mage::getSingleton('core/resource_iterator')->walk(
	$couponsCollection->getSelect(),
	array('callback')
);

function callback($args) {
	$times_used = intval($args['row']['times_used']);
	$usage_per_customer = intval($args['row']['usage_per_customer']);
	$usage_limit = $args['row']['usage_limit'];
	echo $args['row']['code'] . "\n";
	if (
		$usage_limit == '1' &&
		$times_used > 0 &&
		($times_used >= $usage_per_customer)
	) {
		// Mage::getModel('salesrule/coupon')
		// 	->load($args['row']['coupon_id'])
		// 	->delete();
	}
}