PHP图片缩小函数一例

3. /**

4. * 缩小图片函数
5. * 删除了原始图片保留了操作后的图片
6. * @param string $fileName
7. * @return void
8. */
9. private function createSmallImg($fileName)
10. {
11. list($width,$height,$type,$attr) = getimagesize($fileName);
12. $imgOld=imagecreatefromjpeg($fileName);
13. $imgObj=imagecreatetruecolor($width-100,$height-100);
14. if(function_exists('imagecopyresampled'))
15. {
16. imagecopyresampled($imgObj,$imgOld,0,0,0,0,$width-100,$height-100,imagesx($imgOld),imagesy($imgOld));
17. }
18. else
19. {
20. imagecopyresized($imgObj,$imgOld,0,0,0,0,$width-100,$height-100,imagesx($imgOld),imagesy($imgOld));
21. }
22. imagedestroy($imgOld);
23. unlink($fileName);
24. imagejpeg($imgObj,$fileName,100);
25. chmod($fileName,0777);
26. imagedestroy($imgObj);
27. }

28. //调用示例

29. $filename = "/images/test.jpg";
30. createSmallImg($filename);
31. ?>

复制代码