address_fr.php

<?php

$address = '31 rue du 2 chat, 75011 Paris';

function extract_address_fr($address) {
    $address_parts = array();

    // Remove all punctuation
    $address_clean = str_replace(array(',', ';'), ' ', $address);

    // Remove multiple spaces
    $address_clean = preg_replace('/([\s])\1+/', ' ', $address_clean);

    // Extract words from address
    $address_words = explode(' ', $address_clean);

    // Detect zip code
    foreach ($address_words as $word) {
        if (preg_match("/^[0-9]{5,5}$/", $word)) {
            $address_parts['zip'] = $word;
            continue;
        }
    }

    // Cut address around zip code
    if (isset($address_parts['zip'])) {
        $address_before_after_zip = explode($address_parts['zip'], $address_clean);
        if (count($address_before_after_zip) == 2) {
            // Address is everything before zip
            $address_parts['address'] = trim($address_before_after_zip[0]);
            // City is everything after zip
            $address_parts['city'] = trim($address_before_after_zip[1]);
        }
    }

    // Extract address number from address
    if (isset($address_parts['address'])) {
        preg_match('/^[0-9]+/', $address_parts['address'], $street_number);
        if (count($street_number) > 0) {
            $address_parts['street_number'] = $street_number[0];
        }
    }

    return $address_parts;

}

echo '<pre>';
var_dump($address);
echo '</pre>';
echo '<pre>';
var_dump(extract_address_fr($address));
echo '</pre>';