PHPフォーム検証

exit()後続スクリプトの実行を停止
単一フィールドブランク判定

if(empty($_POST['last_name']))
{
echo "You did not enter your last name.
Last name is required.

";
redisplay the form;
exit();
}
echo "Welcome to the Members Only club.
You may select from the menu below.
";
display the menu;

全フィールドブランク判定

foreach($_POST as $value)
{
if($value == "")
{
echo "You have not filled in all the fields.
";
redisplay the form;
exit();
}
}
echo "Welcome";

それ以外は空白判定

foreach($_POST as $field => $value)
{
if($value == "")
{
if($field != "fax" and $field != "middle_name")
{
echo "You have not filled in $field
";
display the form;
exit();
}
}
}
echo "Welcome";