function fix_names($n1, $n2, $n3)
{
    $n1 = ucfirst(strtolower($n1));
    $n2 = ucfirst(strtolower($n2));
    $n3 = ucfirst(strtolower($n3));
    return array($n1, $n2, $n3);
}

$names = fix_names("WILLIAM", "henry", "gatES");
echo $names[0] . " " . $names[1] . " " . $names[2]."<br>";

$a1 = "WILLIAM";
$a2 = "henry";
$a3 = "gatES";

function fix_names(&$n1, &$n2, &$n3)
{
    $n1 = ucfirst(strtolower($n1));
    $n2 = ucfirst(strtolower($n2));
    $n3 = ucfirst(strtolower($n3));
}

echo $a1." ".$a2." ".$a3."<br>";

fix_names($a1, $a2, $a3);
echo $a1." ".$a2." ".$a3;

$a1 = "WILLIAM";
$a2 = "henry";
$a3 = "gatES";

function fix_names()
{
    global $a1; $a1 = ucfirst(strtolower($a1));
    global $a2; $a2 = ucfirst(strtolower($a2));
    global $a3; $a3 = ucfirst(strtolower($a3));
}

echo $a1." ".$a2." ".$a3."<br>";

fix_names();
echo $a1." ".$a2." ".$a3;