substr

<?
$aa="20031229";
$y=substr($aa,0,4);
$m=substr($aa,4,2);
$d=substr($aa,6,2);
echo(" $y 년   $m 월    $d 일      ");
$bb="안녕하세요";
$zz=substr($bb,0,5);
echo("<h1> $zz       ");
?>