php缩略图填充白边的示例代码

3. //源图的路径，可以是本地文件，也可以是远程图片

4. $src_path = '1.jpg';
5. //最终保存图片的宽
6. $width = 160;
7. //最终保存图片的高
8. $height = 120;

9. //源图对象

10. $src_image = imagecreatefromstring(file_get_contents($src_path));
11. $src_width = imagesx($src_image);
12. $src_height = imagesy($src_image);

13. //生成等比例的缩略图

14. $tmp_image_width = 0;
15. $tmp_image_height = 0;
16. if ($src_width / $src_height >= $width / $height) {
17. $tmp_image_width = $width;
18. $tmp_image_height = round($tmp_image_width * $src_height / $src_width);
19. } else {
20. $tmp_image_height = $height;
21. $tmp_image_width = round($tmp_image_height * $src_width / $src_height);
22. }

23. $tmpImage = imagecreatetruecolor($tmp_image_width, $tmp_image_height);

24. imagecopyresampled($tmpImage, $src_image, 0, 0, 0, 0, $tmp_image_width, $tmp_image_height, $src_width, $src_height);

25. //添加白边

26. $final_image = imagecreatetruecolor($width, $height);
27. $color = imagecolorallocate($final_image, 255, 255, 255);
28. imagefill($final_image, 0, 0, $color);

29. $x = round(($width - $tmp_image_width) / 2);

30. $y = round(($height - $tmp_image_height) / 2);

31. imagecopy($final_image, $tmpImage, $x, $y, 0, 0, $tmp_image_width, $tmp_image_height);

32. //输出图片

33. header('Content-Type: image/jpeg');
34. imagejpeg($final_image);

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