이미지 모자이크 효과를 얻기 위해 PHP 및 GD 라이브러리를 사용하는 단계

$sourceImagePath = 'path/to/source/image.jpg';
$sourceImage = imagecreatefromjpeg($sourceImagePath);

$blockSize = 10;

$sourceImageWidth = imagesx($sourceImage);
$sourceImageHeight = imagesy($sourceImage);

$outputImage = imagecreatetruecolor($sourceImageWidth, $sourceImageHeight);

for ($x = 0; $x < $sourceImageWidth; $x += $blockSize) {
    for ($y = 0; $y < $sourceImageHeight; $y += $blockSize) {
        $averageColor = getAverageColor($sourceImage, $x, $y, $blockSize);
        fillBlockWithColor($outputImage, $x, $y, $blockSize, $averageColor);
    }
}

// 获取马赛克块内的平均颜色
function getAverageColor($image, $startX, $startY, $blockSize) {
    $totalR = 0;
    $totalG = 0;
    $totalB = 0;
    $count = 0;

    for ($i = $startX; $i < $startX + $blockSize; $i++) {
        for ($j = $startY; $j < $startY + $blockSize; $j++) {
            $rgb = imagecolorat($image, $i, $j);
            $r = ($rgb >> 16) & 0xFF;
            $g = ($rgb >> 8) & 0xFF;
            $b = $rgb & 0xFF;

            $totalR += $r;
            $totalG += $g;
            $totalB += $b;
            $count++;
        }
    }

    $averageR = round($totalR / $count);
    $averageG = round($totalG / $count);
    $averageB = round($totalB / $count);

    return imagecolorallocate($image, $averageR, $averageG, $averageB);
}

// 将马赛克块填充为指定颜色
function fillBlockWithColor($image, $startX, $startY, $blockSize, $color) {
    imagefilledrectangle($image, $startX, $startY, $startX + $blockSize, $startY + $blockSize, $color);
}

$outputImagePath = 'path/to/output/image.jpg';
imagejpeg($outputImage, $outputImagePath);
imagedestroy($outputImage);