phpv9缩略图模糊

<?php
function createThumbnail($sourcePath, $thumbnailPath, $width, $height) {
    $image = imagecreatefromjpeg($sourcePath);
    if ($image === false) {
        die('无法加载图像');
    }

    // 获取原始图像的宽度和高度
    $originalWidth = imagesx($image);
    $originalHeight = imagesy($image);

    // 计算缩略图的宽度和高度
    if ($originalWidth > $originalHeight) {
        $thumbnailWidth = $width;
        $thumbnailHeight = intval($height * $originalHeight / $originalWidth);
    } else {
        $thumbnailHeight = $height;
        $thumbnailWidth = intval($width * $originalWidth / $originalHeight);
    }

    // 创建一个新的图像资源
    $thumbnail = imagecreatetruecolor($thumbnailWidth, $thumbnailHeight);

    // 使用双三次插值算法进行缩放
    imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $thumbnailWidth, $thumbnailHeight, $originalWidth, $originalHeight);

    // 保存缩略图
    imagejpeg($thumbnail, $thumbnailPath, 90);

    // 释放内存
    imagedestroy($image);
    imagedestroy($thumbnail);
}

// 使用示例
createThumbnail('path/to/source/image.jpg', 'path/to/thumbnail/image.jpg', 100, 100);
?>