Example of generating thumbnails with php GD library

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Release: 2016-07-25 08:54:51
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  1. header("content-type:text/html;charset=gbk");
  2. ini_set("date.timezone","Asia/chong");
  3. //Determine whether the file is empty
  4. if(empty($_FILES)){
  5. echo "The uploaded file is too large";
  6. exit;
  7. }
  8. / /Determine whether there is an error in file upload
  9. if($_FILES['pic']['error']){
  10. echo "Upload file";
  11. exit;
  12. }
  13. //Determine whether the file type is illegal to obtain the file suffix
  14. $allowtype =array("jpg","png","jpeg","gif");
  15. $a=explode('.',$_FILES['pic']['name']);
  16. $index=count( $a)-1;
  17. $ex=strtolower($a[$index]);
  18. if(!in_array($ex,$allowtype)){
  19. echo "Illegal file upload";
  20. exit;
  21. }
  22. $file =date('YmdHis').rand().".".$ex;
  23. $src=$_FILES['pic']['tmp_name'];
  24. $des="upload/".$file;
  25. $ rs=move_uploaded_file($src,$des);

  26. //Thumbnail

  27. //Read uploaded images
  28. $image=imagecreatefromjpeg($des);
  29. $a=getimagesize($ des);
  30. $w=$a[0];
  31. $h=$a[1];
  32. if($w>$h){
  33. $width=300;
  34. $height=$width/$w*$ h;
  35. }else if($w<$h){
  36. $height=300;
  37. $width=$height/$h*$w;
  38. }else{
  39. $width=300;
  40. $height=300;
  41. }
  42. //Create a blank new image
  43. $newimage=imagecreatetruecolor($width, $height);
  44. //Copy source image content copy new image
  45. imagecopyresized($newimage, $image, 0,0, 0,0, $width , $height, $w, $h);
  46. $filename="upload/s_".$file;
  47. imagejpeg($newimage,$filename);

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