php进行文件Zip压缩的代码

3. /* creates a compressed zip file */

4. function create_zip($files = array(),$destination = '',$overwrite = false) {
5. //if the zip file already exists and overwrite is false, return false
6. if(file_exists($destination) && !$overwrite) { return false; }
7. //vars
8. $valid_files = array();
9. //if files were passed in...
10. if(is_array($files)) {
11. //cycle through each file
12. foreach($files as $file) {
13. //make sure the file exists
14. if(file_exists($file)) {
15. $valid_files[] = $file;
16. }
17. }
18. }
19. //if we have good files...
20. if(count($valid_files)) {
21. //create the archive
22. $zip = new ZipArchive();
23. if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
24. return false;
25. }
26. //add the files
27. foreach($valid_files as $file) {
28. $zip->addFile($file,$file);
29. }
30. //debug
31. //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;

32. //close the zip -- done!

33. $zip->close();

34. //check to make sure the file exists

35. return file_exists($destination);
36. }
37. else
38. {
39. return false;
40. }
41. }
42. /***** Example Usage ***/
43. $files=array('file1.jpg', 'file2.jpg', 'file3.gif');
44. create_zip($files, 'myzipfile.zip', true);
45. ?>

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