join.php
<form method="post" action="result.php">
<input type="text" name="id" size="10">
<input type="submit" value="확인">
</form>
result.php -1
<?
function error($message) {
echo "
<script language=javascript>
alert('$message');
history.go(-1);
</script> ";
}
if (!$id) {
error("id를입력하세요");
}
else {
echo "입력하신 id는 $id 입니다";}
?>
result.php -2
<?
if (!$id) {
echo "
<script language=javascript>
alert( ' id를입력하세요');
history.go(-1);
</script> ";
}
else
{ echo"입력하신 id는$id 입니다"; }
?>
cf.뒤로가기스크립트
history.go(-1);