php

<?php

$dataSelect = [3,5,10,15,20];

$select = '';

for($i=0; $i < count($dataSelect); $i++) {

$select .= '<option>'.$dataSelect[$i].'</option>';

}

if(isset($_POST['submit'])) {

    echo $_POST['pilih'];
}

?>

<!DOCTYPE html>
<html>
<head>
    <title>Select Data</title>
</head>
<body>

<form action="tes.php" method="POST" enctype="multipart/form-data">

<select name="pilih"> <?php echo $select;?> </select>

<button type="submit" name="submit">Send Data</button>

</form>

</body>
</html>