Type=hidden

<?php
$command=$_POST['command']; // 取出變數值
if ($command==null) {       // 空值, 未經由form傳送
    echo "<html>";
    echo "<body>";
    echo "<center>";
    echo "<form method=post action=$SELF_PHP>";
    echo "使用者名稱:";
    echo "<input type=text name=username size=10>";
    echo "<p>";
    echo "使用者密碼:";
    echo "<input type=password name=password size=10>";
    echo "<p>";
    echo "<input type=hidden name=number value='this is a hidden value'>";
    echo "<input type=submit name=command value=送出>";
    echo "<input type=reset name=command value=清除>";
    echo "</form>";
    echo "</center>";
    echo "</body>";
    echo "</html>";
}
else if ($command=='送出') {
    $username=$_POST["username"];
    $password=$_POST["password"];
    $hidden_value=$_POST['number'];
    echo "<html>";
    echo "<body>";
    echo "<center>";
    echo "使用者名稱為" . $username . "<br>";
    echo "使用者密碼為" . $password . "<br>";
    echo "隱藏值為" . $hidden_value . "<br>";
    echo "</center>";
    echo "</body>";
    echo "</html>";
}
?>

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