How PHP uses the GD library to create thumbnail images _php tips

This example describes how PHP uses the GD library to create thumbnail images of pictures. Share to everyone for your reference. The specific analysis is as follows:

Static HTML code for uploading pages:

The corresponding upload.php file code:

<?php 
$uploadfile = "upfiles/". $_files[' upfile ' [' name '];
The file name and path 
$smallfile = "Upfiles/small_" after the upload. $_files[' upfile ' [' name '];
File name and path 
if ($_files[' upfile '] [' type ']!= "Image/pjpeg") 
{ 
  echo "file type error";//Output error message 
} 
Else 
{ 
  move_uploaded_file ($_files[' upfile '] [' tmp_name '], $uploadfile);
  Upload file 
  $dstW = 200;//Set the width of the thumbnail 
  $dstH = 200;//Set the height of the thumbnail 
  $src _image = Imagecreatefromjpeg ($uploadfile); c16/>//reads the JPEG file and creates the image object 
  $srcW = Imagesx ($src _image);//Get the image wide 
  $srcH = Imagesy ($src _image);//Get high 
  $ for image Dst_image = Imagecreatetruecolor ($dstW, $dstH);
  Create a new Image Object 
  imagecopyresized ($dst _image, $src _image,0,0,0,0, $dstW, $dstH, $srcW, $srcH);
  Writes the image to the new Image object 
  imagejpeg ($dst _image, $smallfile) after the size is redefined;//create thumbnail file 
  echo "File upload complete <BR>"//Output Upload success Information 
  echo "</img>";
  Show thumbnails on the page 
} 
?>

I hope this article will help you with your PHP program design.