Phone number formatter for Korean.

phone_number_formatter.php

<?php
function phone($str) {
    $AREA_CODES = array("010", "02", "011", "031", "012", "032", "033", "041",
                        "015", "042", "016", "043", "017", "044", "018", "051",
                        "019", "052", "053", "054", "055", "061", "062", "063",
                        "064");

    // 하이픈 모두 제거
    $flattened = str_replace("-", "", $str);

    foreach ($AREA_CODES as $code) {
        if (strpos($flattened, $code) !== 0) {
            continue;
        }
        $else = substr($flattened, strlen($code));
        $middle = substr($else, 0, strlen($else) / 2);
        $last = substr($else, strlen($else) / 2);
        $numbers = array($code, $middle, $last);
        return join($numbers, "-");
    }

    return $str;
}
?>