Graduation pt.2

<?php

$name = readline();
$counter = 1;
$sum = 0;
$excluded = 0;
$isExcluded = FALSE;
while ($counter <= 12) {
    $grade = floatval(readline());
    if ($grade < 4) {
        $excluded++;
    } else if ($grade >= 4 && $grade <= 6) {
        $sum += $grade;
        $counter++;
    }
    if ($excluded >= 2) {
        $isExcluded = TRUE;
        break;
    }
}
if ($isExcluded == FALSE) {
    $avarage = $sum / 12;
    printf("$name graduated. Average grade: %0.2f", $avarage);
} else {
    echo "$name has been excluded at $counter grade";
}