Тег <optgroup></optgroup>

Этот тег определяет контейнер для тега <option></option>.

Аргумент	Значение
label	text
disabled	disabled

index.php

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Name Page</title>
</head>
<body>
<?php
if($_SERVER['REQUEST_METHOD'] == 'POST') {
$select = $_POST['select'];
if($_REQUEST['clear']) {
$select = null;
}
}
?>
<form action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="post">
<fieldset>
<legend>This data will send into a server</legend>
<label>Select the text</label>
   
<select name="select">
<optgroup label="English">
<option value="Hello World!">Hello World!</option>
<option value="To be or not to be?">To be or not to be?</option>
</optgroup>
<optgroup label="Russian">
<option value="Привет Мир!">Привет Мир!</option>
<option value="Быть или не быть?">Быть или не быть?</option>
</optgroup>
</select>
   
<input type="submit" name="perform" value="Perform" />
   
<input type="submit" name="clear" value="   Clear   " />
</fieldset>
<fieldset>
<legend>Reading data from a server</legend>
<?php
if($_SERVER['REQUEST_METHOD']=='POST' && $_REQUEST['perform'] && !$_REQUEST['clear']) {
echo $select, '<br /';
}
else {
echo null;
}
?>
</fieldset>
</form>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Name Page</title>
</head>
<body>
<?php
if($_SERVER['REQUEST_METHOD'] == 'POST') {
$select = $_POST['select'];
if($_REQUEST['clear']) {
$select = null;
}
}
?>
<form action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="post">
<fieldset>
<legend>This data will send into a server</legend>
<label>Select the text</label>
   
<select name="select">
<optgroup label="English">
<option value="Hello World!">Hello World!</option>
<option value="To be or not to be?">To be or not to be?</option>
</optgroup>
<optgroup label="Russian">
<option value="Привет Мир!">Привет Мир!</option>
<option value="Быть или не быть?">Быть или не быть?</option>
</optgroup>
</select>
   
<input type="submit" name="perform" value="Perform" />
   
<input type="submit" name="clear" value="   Clear   " />
</fieldset>
<fieldset>
<legend>Reading data from a server</legend>
<?php
if($_SERVER['REQUEST_METHOD']=='POST' && $_REQUEST['perform'] && !$_REQUEST['clear']) {
echo $select, '<br /';
}
else {
echo null;
}
?>
</fieldset>
</form>
</body>
</html>