<?php
if ($_POST['gonder'])
{
    $deger = $_POST['deger'];
    for ($i = 0; $i < sizeof($deger); $i++) {
        echo 'Değer ' . $i . ': ' . $deger['x'.$i] . '<br /><br />';
    }
}
?>
<form action="" method="post">
    <input type="text" name="deger[x0]" />
    <input type="text" name="deger[x1]" />
    <input type="text" name="deger[x2]" />
    <input type="text" name="deger[x3]" />
    <input type="submit" name="gonder" />
</form>