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PHP Thumbnail function

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  1. function set_thumb($file, $photos_dir=�uploads/photos�,$thumbs_dir=�uploads/photos/thumbs�, $square_size=167, $quality=100) {
  2. 	//check if thumb exists
  3. 	if (!file_exists($thumbs_dir."/".$file)) {
  4. 		//get image info
  5. 		list($width, $height, $type, $attr) = getimagesize($photos_dir."/".$file);
  6. 		//set dimensions
  7. 		if($width> $height) {
  8. 			$width_t=$square_size;
  9. 			//respect the ratio
  10. 			$height_t=round($height/$width*$square_size);
  11. 			//set the offset
  12. 			$off_y=ceil(($width_t-$height_t)/2);
  13. 			$off_x=0;
  14. 		} elseif($height> $width) {
  15. 			$height_t=$square_size;
  16. 			$width_t=round($width/$height*$square_size);
  17. 			$off_x=ceil(($height_t-$width_t)/2);
  18. 			$off_y=0;
  19. 		} else {
  20. 			$width_t=$height_t=$square_size;
  21. 			$off_x=$off_y=0;
  22. 		}
  23. 		$thumb=imagecreatefromjpeg($photos_dir."/".$file);
  24. 		$thumb_p = imagecreatetruecolor($square_size, $square_size);
  25. 		//default background is black
  26. 		$bg = imagecolorallocate ( $thumb_p, 255, 255, 255 );
  27. 		imagefill ( $thumb_p, 0, 0, $bg );
  28. 		imagecopyresampled($thumb_p, $thumb, $off_x, $off_y, 0, 0, $width_t, $height_t, $width, $height);
  29. 		imagejpeg($thumb_p,$thumbs_dir."/".$file,$quality);
  30. 	}
  31. }

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