[OSM-dev] Extracting house-number from string - solution (?)

[Andreas Kalsch]

A function inside a PHP class I coded some time ago to populate a 
database with Google Maps API data. The code is currently not maintained 
any more so I am not sure if it's still working correctly. The input 
string is not a complete geocode request but the thoroughfare of an 
address, made of street and house number. Just give it a try - it worked 
fine for me, as far as I remember:

/**
     * thoroughfare-Angabe in Straßenname und Hausnummer aufsplitten
     *   
     * @param $thoroughfare string
     * @param $country string Country-Code, von dem abhängt, ob 
Hausnummer links oder rechts steht
     * @return array(thoroughfareName, houseNumber)
     */
    //// berücksichtige HK - kein leerzeichen vor Hausnr
    // OK
    static function splitThoroughfare($thoroughfare, $country) {

        $parts = preg_split("/[ \,]+/", $thoroughfare);
        $partsC = count($parts);
        
        if ($partsC == 1) return array($parts[0], NULL);
       
// I wrote this class for the Google Geocoding API, and sometimes Google 
returned the house number on the left side - no matter of the country
// I think this is fixed no and so self::$googleForcesHouseNumberLeft is 
false
        $houseNumberIsLeft = self::$googleForcesHouseNumberLeft
            ? true
// I18n::$houseNumberLeftCountries is an array with all country codes 
(upper case) of countries where house number is left
            : in_array($country, I18n::$houseNumberLeftCountries);
        $summand = $houseNumberIsLeft ? 1 : -1;

        for (
            $i = $houseNumberIsLeft ? 0 : $partsC - 1;
            $houseNumberIsLeft ? ($i < $partsC) : ($i >= 0);
            $i += $summand) {
            
            // part of street name found
            if (
                preg_match('/\p{L}{2}/u', $parts[$i])
                ||
                    preg_match('/\p{L}/u', $parts[$i])
                    && preg_match('/^\D+$/', $parts[$i])
            ) {
            
                if ($houseNumberIsLeft) {
                    
                    $thoroughfare = array_slice($parts, $i);
                    $houseNumber = array_slice($parts, 0, $i);
                }
                else {
                
                    $thoroughfare = array_slice($parts, 0, $i + 1);
                    $houseNumber = array_slice($parts, $i + 1);
                }
                
                return array(
                    implode(' ', $thoroughfare),
                    implode(' ', $houseNumber)
                );
            }
        }
    }