gistfile1.php

<?php
    function splitAddress($address, $width = 35) {
        if (strlen($address) < $width)
            return array('address1' => $address, 'address2' => null);

        $string = wordwrap($address, $width);
        $full = explode("\n", $string);

        $address1 = $full[0];
        $address2 = $full[1];

        if (is_numeric(substr($address2, 0))) {
            // We want to take the last word of $address1, remove it and prepend it to $address2
            $pattern = '/[^ ]*$/';
            preg_match($pattern, $address1, $results);
            $address1 = trim(preg_replace($pattern, '', $address1));
            $address2 = $results[0] . ' ' . $address2;
        }

        return array('address1' => $address1, 'address2' => $address2);
    }