php resize images

澳洲大头

Resize Images (create thumbnails)

This script will take any image and automatically create a thumbnail of any size you want.   The instructions for using this script are in the comment lines at the top of the script.

1. <?php
   
2. // this script creates a thumbnail image from an image file - can be a .jpg .gif or .png file
   
3. // where $thumbsize is the maximum width or height of the resized thumbnail image
   
4. // where this script is named resize.php
   
5. // call this script with an image tag
   
6. // <img src="resize.php?path=imagepath"> where path is a relative path from the document root - such as subdirectory/image.jpg
   
7. $thumbsize = 200;
   
8. $imagesource = $_SERVER['DOCUMENT_ROOT']."/".$_GET['path'];
   
9. if (!file_exists($imagesource)) die();
   
10. $filetype = strtolower(substr($imagesource,strlen($imagesource)-4,4));
    
11. if($filetype == ".gif") $image = @imagecreatefromgif($imagesource);
    
12. if($filetype == ".jpg") $image = @imagecreatefromjpeg($imagesource);
    
13. if($filetype == ".png") $image = @imagecreatefrompng($imagesource);
    
14. if (empty($image)) die();
    
15. $imagewidth = imagesx($image);
    
16. $imageheight = imagesy($image);
    
17. if ($imagewidth >= $imageheight) {
    
18. $thumbwidth = $thumbsize;
    
19. $factor = $thumbsize / $imagewidth;
    
20. $thumbheight = $imageheight * $factor;
    
21. }
    
22. if ($imageheight >= $imagewidth) {
    
23. $thumbheight = $thumbsize;
    
24. $factor = $thumbsize / $imageheight;
    
25. $thumbwidth = $imagewidth * $factor;
    
26. }
    
27. $thumb = @imagecreatetruecolor($thumbwidth,$thumbheight);
    
28. imagecopyresized($thumb, $image, 0, 0, 0, 0, $thumbwidth, $thumbheight, $imagewidth, $imageheight);
    
29. header("Content-type: image/jpeg");
    
30. imagejpeg($thumb);
    
31. imagedestroy($image);
    
32. imagedestroy($thumb);
    
33. ?>

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