Несколько скриптов в одном файле

// Действие
$do = $_GET['do'];
 
if( $do == 1 )
{
    // Тут первый скрипт
}
elseif( $do == 2 )
{
    // Тут второй скрипт
}

<?php
$result = exec ('./stop.sh');
?>

<?php
$result = exec ('./start.sh');
?>

<?php
$do = $_GET['do'];
 
if( $do == 1 )
{
$result = exec ('./stop.sh');
}
elseif( $do == 2 )
{
$result = exec ('./start.sh');
}
?>

if (isset($_GET['do'])) {
    switch ($_GET['do']) {
        case 'start' :
            $result = exec('./start.sh');
        break;
 
        case 'stop' :
            $result = exec('./stop.sh');
        break;
    }
}

$commands = array(
    'start' => './start.sh',
    'stop'  => './stop.sh',
);
if (isset($_GET['do'], $commands[$_GET['do']])) {
    $result = exec($commands[$_GET['do']]);
}

<?php 
$host = "localhost"; 
?>

<?php include "config.php"; ?>
<?php
$commands = array(
    'start' => './server +ip <?php echo ("$host"); ?>',
 
);
if (isset($_GET['do'], $commands[$_GET['do']])) {
    $result = exec($commands[$_GET['do']]);
}
?>

<?php include "config.php"; ?>
<?php
$commands = array(
    'start' => './server +ip localhost',
 
);
if (isset($_GET['do'], $commands[$_GET['do']])) {
    $result = exec($commands[$_GET['do']]);
}
?>

'start' => './server +ip <?php echo ("$host"); ?>'

'start' => './server +ip '.$host