PHP function to get an array with indexes 'name' and 'num' from a string containing a street name and number.

splitStreetNameNumber.php

<?php

/**
 * Takes a string containing a (german) street name and number and
 * returns an array with indexes 'name' (containing the street name)
 * and 'num' (containing the street number). If no match is found,
 * return value is boolean 'false'.
 */
function splitStreetNameNumber($str, $numRequired = false) {
    $str = trim($str);
    $tmp = @preg_split('/[0-9]+/', $str);
    $num = trim(str_replace(trim($tmp[0]), '', $str));

    if ( 0 >= strlen($str) || 0 >= strlen(trim($tmp[0])) || ($numRequired && 0 >= strlen($num)) ) {
        return false;
    }

    return array(
        'name' => trim($tmp[0]),
        'num' => trim(str_replace(trim($tmp[0]), '', $str)),
    );
}

// Examples:

$a = array(
    'Karlstr. 2',
    '12345',
    'Karl Straße 2d',
    'Karlsplatz 14 a',
    '',
    'Karlsplatz',
);


foreach($a as $b) {
    $c = splitStreetNameNumber($b);
    if (!$c) {
        printf("Match result for '%s': Not a valid address.\r\n", $b);
    }
    else {
        printf("Match result for '%s': Streetname: '%s', Streetnumber: '%s'.\r\n", $b, $c['name'], $c['num']);
    }
    /* Prints:
     * Match result for 'Karlstr. 2': Streetname: 'Karlstr.', Streetnumber: '2'.
     * Match result for '12345': Not a valid address.
     * Match result for 'Karl Straße 2d': Streetname: 'Karl Straße', Streetnumber: '2d'.
     * Match result for 'Karlsplatz 14 a': Streetname: 'Karlsplatz', Streetnumber: '14 a'.
     * Match result for '': Not a valid address.
     * Match result for 'Karlsplatz': Streetname: 'Karlsplatz', Streetnumber: ''.
     */
}
print "\r\n--------------------------------\r\n\r\n";

foreach($a as $b) {
    $c = splitStreetNameNumber($b, true); // set 2nd parameter to 'true' in case a street number is required.
    if (!$c) {
        printf("Match result for '%s': Not a valid address.\r\n", $b);
    }
    else {
        printf("Match result for '%s': Streetname: '%s', Streetnumber: '%s'.\r\n", $b, $c['name'], $c['num']);
    }
    /* Prints:
     * Match result for 'Karlstr. 2': Streetname: 'Karlstr.', Streetnumber: '2'.
     * Match result for '12345': Not a valid address.
     * Match result for 'Karl Straße 2d': Streetname: 'Karl Straße', Streetnumber: '2d'.
     * Match result for 'Karlsplatz 14 a': Streetname: 'Karlsplatz', Streetnumber: '14 a'.
     * Match result for '': Not a valid address.
     * Match result for 'Karlsplatz': Not a valid address.
     */
}