폼처리 관련 함수

/**
 * 주민번호 유효성 검사
 * @param $string $jumin
 */
function validate_jumin($jumin) {
	// 형태 검사: 총 13자리의 숫자, 7번째는 1..4의 값을 가짐
	if (!preg_match('/^[0-9]{6}[1-4][0-9]{6}$/', $jumin))
		return false;
	
	// 날짜 유효성 검사
	$birthYear = ('2' >= $jumin[6]) ? '19' : '20';
	$birthYear += substr($jumin, 0, 2);
	$birthMonth = substr($jumin, 2, 2);
	$birthDate = substr($jumin, 4, 2);
	if (!checkdate($birthMonth, $birthDate, $birthYear))
		return false;
	
	// Checksum 코드의 유효성 검사
	for ($i = 0; $i < 13; $i++) $buf[$i] = (int) $jumin[$i];
	$multipliers = array(2,3,4,5,6,7,8,9,2,3,4,5);
	for ($i = $sum = 0; $i < 12; $i++) $sum += ($buf[$i] *= $multipliers[$i]);
	if ((11 - ($sum % 11)) % 10 != $buf[12])
		return false;
	
	// 모든 검사를 통과하면 유효한 주민등록번호임
	return true;
}

/**
 * select태그 생성 헬퍼
 * @param string $name name/id
 * @param array $options option들
 * @param string $select 선택값
 * @return string
 */
function make_select($name, $options, $select = '', $desc = '선택', $tag = '') {
    $rtn = '<select name="'.$name.'" id="'.$name.'" '.$tag.'>';
    if($desc !== NULL)
        $rtn .= '<option value="" '.(!$select?'select="select"':'').'>'.$desc.'</option>';
    foreach($options as $key => $val) {
        $rtn .= '<option value="'.$key.'" '.((string)$key===(string)$select?'selected="selected"':'').'>'.$val.'</option>';
    }
    $rtn .= '</select>';
    return $rtn;
}
/**
 * 숫자셀렉트
 * @param string $name name/id
 * @param int $syear
 * @param int $eyear
 * @param mixed $select
 * @param string $desc
 * @param string $tag
 * @return string
 */
function make_select_num($name, $snum, $enum, $select = NULL, $desc = NULL, $tag = '') {
    $rtn = '<select name="'.$name.'" id="'.$name.'" '.$tag.'>';
    if($desc !== NULL) {
        $rtn .= '<option value="" '.(!$select?'select="select"':'').'>'.$desc.'</option>';
    }
    for($i=$snum;$i<=$enum;$i++) {
        $rtn .= '<option value="'.$i.'" '.($i==$select?'selected="selected"':'').'>'.$i.'</option>';
    }
    $rtn .= '</select>';
    return $rtn;
}
/**
 * select 태그(telecom) 생성 헬퍼
 * @param string $name name/id
 * @param string $select 선택값
 * @return string
 */
function make_telecom($name, $select = '') {
    $options = array(
        'SKT' => 'SKT',
        'KTF' => 'KT',
        'LGT' => 'LGT'
    );
    $rtn = '<select name="'.$name.'" id="'.$name.'">';
    $rtn .= '<option value="" '.(!$select?'select="select"':'').'>통신사</option>';
    foreach($options as $key => $val) {
        $rtn .= '<option value="'.$key.'" '.((string)$key===(string)$select?'selected="selected"':'').'>'.$val.'</option>';
    }
    $rtn .= '</select>';
    return $rtn;
}