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Example of PHP scale image generation thumbnail function

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Release： 2016-07-25 08:53:18
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  2. /*
  3. *@im //Picture resources that need to be scaled
  4. *@filetype //The thumbnail file type produced
  5. *@dstimW //The width of the scaled picture
  6. *@dstimH //Height of the zoomed picture
  7. *@thumbname //Thumbnail file name
  8. // WWW.JBXUE.COM
  9. function makethumb($im,$dstimW,$dstimH,$thumbname,$filetype){
  10. //Get im The width and height of
  11. $pic_W=imagesx($im);
  12. $pic_H=imagesy($im);
  13. $arr = array();
  14. swith($filetype){
  15. case 'jpg':
  16. $arr[$ filetype]="imagejpeg";
  17. break;
  18. case 'png';
  19. $arr[$filetype]="imagepng";
  20. break;
  21. case 'jif';
  22. $arr[$filetype]="imagegif";
  23. }
  24. if(($dstimgW && $dstimgW<$pic_W) || ($dstimgH && $dstimgH<$pic_H) ){
  25. if($dstimgW && $dstimgW<$pic_W){
  26. $dsimgWratio = $dstimgW / $pic_w ;
  27. $resizereagW =true;
  28. }
  29. if($dstimgH && $ $dstimgH <$pic_H){
  30. $dsimgHratio = $dstimgH/$pic_H;
  31. $resizerreagH =true;
  32. }
  33. //Thumbnail width and height For the original image aspect ratio, take the smallest one
  34. if($resizereagW && $resizerreagH){
  35. if($dsimgWratio<$dsimgHratio)
  36. $radio = $dsimgWratio;
  37. else
  38. $radio = $dsimgHratio;
  39. }
  40. if( $resizereagW && !$resizerreagH ){
  41. $radio = $dsimgWratio;
  42. }
  43. if(!$resizereagW && $resizerreagH){
  44. $radio = $dsimgHratio ;
  45. }
  46. $imgnewW = $pic_W * $radio;
  47. $imgnewH = $pic_H * $radio;
  48. if(function_exists("imgcopyresampled")){
  49. //Create the target resource canvas
  50. $dst = imagecreatetruecolor ($imgnewW, $imgnewH);
  51. imagecopyresampled ($dst,$im,0,0 ,0,0,$imgnewW,$imgnewH,$pic_W,$pic_H);
  52. }else{
  53. $dst=imagecreate($imgnewW, $imgnewH);
  54. imagecopyresized ($dst, $im,0,0,0, 0,$imgnewW,$imgnewH,$imgnewH,$pic_W,$pic_H);
  55. }
  56. $arr[$filetype]($dst,$thumbname.".$filetype");
  57. imagedestroy ($dst);
  58. } else{//The width and height of the thumbnail itself are already greater than the width and height of the original image
  59. //Then the width and height of the thumbnail are the width and height of the original image
  60. $arr[$filetype] ($im,$thumbname.".$filetype");
  61. imagedestroy();
  62. }
  63. }
  64. ?>
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Related labels：
PHP等比例缩放图片生成缩略图函数的例子
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