Magento 1.9, php 5.6 - Use of iconv.internal_encoding is deprecated

You can use the following patch:

• 0001-BUGIFX-Magento-Zend-Framework-1-PHP5.6.patch

It is from the full Github-Gist:

Bugfix for Zend Framework 1 in Magento (>= 1.7..) + PHP 5.6

https://gist.github.com/renttek/29beaaa1e90909639501

I don't think you are supposed to use Magento with php 5.6 yet.
I assume there will be an official statement when Magento will support php 5.6 and an offical patch if necessary.

You need to change lib/Zend/Validate/Hostname.php and replace the internal_encoding related calls with ini_get('default_encoding') and all the other occurences in the Zend framework also...