10. Diamond, 06. Drawing Figures with Loops

<?php
$n = intval(readline());
$starsInTop = null;
if ($n % 2 == 1) {
    $starsInTop = 1;
} else {
    $starsInTop = 2;
}

//Top part
$numberOfDashesInTop = floor(($n - $starsInTop) / 2);
$dashes = str_repeat('-', $numberOfDashesInTop);
$stars = str_repeat('*', $starsInTop);
echo "$dashes" . "$stars" . "$dashes\n";

//Mid part
$numberOfDashesBetweenStars = 0;
if ($n % 2 == 0) {
    $numberOfDashesBetweenStars = 2;
} else {
    $numberOfDashesBetweenStars = 1;
}
$numberOfDashesPerSide = floor(($n - 2 - $numberOfDashesBetweenStars) / 2);

$upperPartHeight = 0;
if ($n % 2 == 1) {
    $upperPartHeight = $n / 2;
} else {
    $upperPartHeight = (floor($n / 2) - 1);
}

for ($i = 1; $i <= $upperPartHeight; $i++) {
    $dashesPerSide = str_repeat('-', $numberOfDashesPerSide);
    $dashesBetweenStars = str_repeat('-', $numberOfDashesBetweenStars);
    echo "$dashesPerSide*$dashesBetweenStars*$dashesPerSide\n";

    $numberOfDashesPerSide--;
    $numberOfDashesBetweenStars += 2;
}

$numberOfDashesPerSideDown = 1;
$numberOfDashesBetweenStarsDown = ($n - 4);
$downPartHeight = $upperPartHeight - 1;

for ($i = 1; $i <= $downPartHeight; $i++) {
    $dashesPerSideDown = str_repeat('-', $numberOfDashesPerSideDown);
    $dashesBetweenStarsDown = str_repeat('-', $numberOfDashesBetweenStarsDown);
    echo "$dashesPerSideDown*$dashesBetweenStarsDown*$dashesPerSideDown\n";

    $numberOfDashesPerSideDown++;
    $numberOfDashesBetweenStarsDown -= 2;
}

//Down part
if ($n > 2) {
    $dashes = str_repeat('-', $numberOfDashesInTop);
    $stars = str_repeat('*', $starsInTop);
    echo "$dashes" . "$stars" . "$dashes\n";
}