更新：
如果您想利用Imagick的优势（如果已安装在服务器上）。注意：我没有使用Imagick的性质，
writeFile因为我在服务器上遇到了问题。文件放置内容也一样。
<?phpfunction generateThumbnail($img, $width, $height, $quality = 90){ if (is_file($img)) { $imagick = new Imagick(realpath($img)); $imagick->setImageFormat('jpeg'); $imagick->setImageCompression(Imagick::COMPRESSION_JPEG); $imagick->setImageCompressionQuality($quality); $imagick->thumbnailImage($width, $height, false, false); $filename_no_ext = reset(explode('.', $img)); if (file_put_contents($filename_no_ext . '_thumb' . '.jpg', $imagick) === false) { throw new Exception("Could not put contents."); } return true; } else { throw new Exception("No valid image provided with {$img}."); }}// example usagetry { generateThumbnail('test.jpg', 100, 50, 65);}catch (ImagickException $e) { echo $e->getMessage();}catch (Exception $e) { echo $e->getMessage();}?>我一直在使用它，只需在存储原始图像并使用该位置创建缩略图后执行该功能即可。根据自己的喜好编辑…
function makeThumbnails($updir, $img, $id){ $thumbnail_width = 134; $thumbnail_height = 189; $thumb_beforeword = "thumb"; $arr_image_details = getimagesize("$updir" . $id . '_' . "$img"); // pass id to thumb name $original_width = $arr_image_details[0]; $original_height = $arr_image_details[1]; if ($original_width > $original_height) { $new_width = $thumbnail_width; $new_height = intval($original_height * $new_width / $original_width); } else { $new_height = $thumbnail_height; $new_width = intval($original_width * $new_height / $original_height); } $dest_x = intval(($thumbnail_width - $new_width) / 2); $dest_y = intval(($thumbnail_height - $new_height) / 2); if ($arr_image_details[2] == IMAGETYPE_GIF) { $imgt = "ImageGIF"; $imgcreatefrom = "ImageCreateFromGIF"; } if ($arr_image_details[2] == IMAGETYPE_JPEG) { $imgt = "ImageJPEG"; $imgcreatefrom = "ImageCreateFromJPEG"; } if ($arr_image_details[2] == IMAGETYPE_PNG) { $imgt = "ImagePNG"; $imgcreatefrom = "ImageCreateFromPNG"; } if ($imgt) { $old_image = $imgcreatefrom("$updir" . $id . '_' . "$img"); $new_image = imagecreatetruecolor($thumbnail_width, $thumbnail_height); imagecopyresized($new_image, $old_image, $dest_x, $dest_y, 0, 0, $new_width, $new_height, $original_width, $original_height); $imgt($new_image, "$updir" . $id . '_' . "$thumb_beforeword" . "$img"); }}上述功能创建的图像具有统一的缩略图尺寸。如果图像的大小与指定的缩略图大小不同（按比例），则其顶部和底部只有空格。
