//源图的路径，可以是本地文件，也可以是远程图片
$src_path = '1.jpg';//最终保存图片的宽$width = 160;//最终保存图片的高$height = 120;//源图对象
$src_image = imagecreatefromstring(file_get_contents($src_path));$src_width = imagesx($src_image);$src_height = imagesy($src_image);//生成等比例的缩略图
$tmp_image_width = 0;$tmp_image_height = 0;if ($src_width / $src_height >= $width / $height) { $tmp_image_width = $width; $tmp_image_height = round($tmp_image_width * $src_height / $src_width);} else { $tmp_image_height = $height; $tmp_image_width = round($tmp_image_height * $src_width / $src_height);}$tmpimage = imagecreatetruecolor($tmp_image_width, $tmp_image_height);
imagecopyresampled($tmpimage, $src_image, 0, 0, 0, 0, $tmp_image_width, $tmp_image_height, $src_width, $src_height);//添加白边
$final_image = imagecreatetruecolor($width, $height);$color = imagecolorallocate($final_image, 255, 255, 255);imagefill($final_image, 0, 0, $color);$x = round(($width - $tmp_image_width) / 2);
$y = round(($height - $tmp_image_height) / 2);imagecopy($final_image, $tmpimage, $x, $y, 0, 0, $tmp_image_width, $tmp_image_height);
//输出图片
header('content-type: image/jpeg');imagejpeg($final_image);
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