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Examples of how to enlarge and reduce php images in equal proportions

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2016-07-25 08:59:111061browse
  1. /**

  2. * Image proportional enlargement and reduction
  3. * @resizeimage
  4. * @param $srcfile source file size
  5. * @param $mySize size to be converted
  6. * edit bbs.it-home.org
  7. * at 2013/6/7
  8. */
  9. function resizeimage($srcfile,$mySize){
  10. $size=getimagesize($srcfile);
  11. switch($size[2]){
  12. case 1:
  13. $img=imagecreatefromgif($srcfile);
  14. break;
  15. case 2:
  16. $img=imagecreatefromjpeg($srcfile);
  17. break;
  18. case 3:
  19. $img=imagecreatefrompng($srcfile);
  20. break;
  21. }
  22. //源图片的宽度和高度
  23. $oldImg['w']=imagesx($img);
  24. $oldImg['h']=imagesy($img);
  25. if ($oldImg['w']<=$mySize['w'] && $oldImg['h']<156){
  26. $rate=1;
  27. }elseif ($oldImg['w']>$mySize['w'] && $oldImg['h']<$mySize['h']){
  28. $rate=$mySize['w']/$oldImg['w'];
  29. }elseif ($oldImg['w']<$mySize['w'] && $oldImg['h']>$mySize['h']){
  30. $rate=$mySize['h']/$oldImg['h'];
  31. }elseif ($oldImg['w']>$mySize['w'] && $oldImg['h']>$mySize['h']){
  32. $rate1=$mySize['w']/$oldImg['w'];
  33. $rate2=$mySize['h']/$oldImg['h'];
  34. if ($rate1>$rate2){$rate=$rate2;}else{$rate=$rate1;}
  35. }
  36. $newImg['w']=$oldImg['w']*$rate;
  37. $newImg['h']=$oldImg['h']*$rate;
  38. return "width=".$newImg['w']." height=".$newImg['h'];
  39. }

  40. //调用示例:

  41. $mySize=array('w'=>143,'h'=>156);
  42. $imgSize=resizeimage("22.jpg",$mySize);
  43. echo "";
  44. ?>

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