Upload an image and add a watermark? How can this problem be solved?

Add a watermark to the uploaded image ??? Add a watermark to the uploaded image ??? I implemented a function for uploading images (images can be uploaded after testing, which is no problem). now, when I want to upload an image by adding a watermark image (a small gif, the webpage prompts the function imagecopymerge () to report an error. I don't know what went wrong. can you help me see how to add a watermark to the uploaded image ???
Add a watermark to the uploaded image ???


I implemented a function for uploading images (images can be uploaded after testing. this is no problem)

Add a watermark image (a small gif) when uploading an image)

When uploading an image, the webpage prompts the function imagecopymerge () to report an error. I don't know what went wrong. please help me see it.


Function code for uploading images:

PHP code

  /* $ Files is the uploaded image file $ folder is the folder for uploading images */function uploads ($ files, $ folder) {// get the image suffix $ knamearray = explode (". ", $ _ FILES [" upfile "] [" name "]); $ kname = $ knamearray [count ($ knamearray)-1]; // set the image file name to system Time $ filename = date ('ymdhis '); $ filenames = $ filename. $ code. ". ". $ kname; $ upfile = $ folder. "/". $ filenames; // upload the image move_uploaded_file ($ files, $ upfile); // add the watermark image ...... $ Im = imagecreatefromgif ("wimages/logo.gif"); // The size of a logo.gif image is 120*45 imagecopymerge ($ upfile, $ im, 80 ); // the following error message is displayed... Return $ filenames; // return the image file name}

------ Solution --------------------
$ Im = imagecreatefromgif ("wimages/logo.gif"); // The size of the logo.gif image is 120*45
It is best to change the path to a relative path;
Imagecopymerge ($ upfile, $ im, 0, 0, 0, 45, 80); // you are prompted for a problem...
Could you help me explain the meaning of the parameters of imagecopymerge?
------ Solution --------------------
Discussion
$ Im = imagecreatefromgif ("wimages/logo.gif"); // The size of the logo.gif image is 120*45
It is best to change the path to a relative path;
Imagecopymerge ($ upfile, $ im, 0, 0, 0, 45, 80); // you are prompted for a problem...
Could you help me explain the meaning of the parameters of imagecopymerge?

------ Solution --------------------
You can write as follows:

$ Descrition = "/upload/imag_1123323.jpg"; // This is the path and file name of the watermark image;

$ Nimage = imagecreatetruecolor ($ image_size [0], $ image_size [1]); // create a true color image
// $ Image_size is the array of image size information to be watermark;

$ Simage = imagecreatefromgif ($ destination); // read the image to be watermark in gif format;

Imagecopy ($ nimage, $ simage, 0, 0, 0, $ image_size [0], $ image_size [1]);
// Copy the image to be watermark to the created real-color image;
Imagedestroy ($ simage); // destroy
$ Simage1 = imagecreatefromgif ("wimages/logo.gif") // This path is estimated to be correct.
// Read the watermark image
Imagecopy ($ nimage, $ simage1,); // Copy the watermark to the image;


Imagejpeg ($ nimage, $ descrtion); // Save the new image after adding the three images as an image without watermarks.

Imagedestroy ($ nimage); // destroy
Imagedestroy ($ simage );
------ Solution --------------------
Recently, I used an online tool to modify it and made it into a class ,,
With this class, you can upload multiple images ....

PHP code

Class upimg {// This class is used to upload images of the $ uptypes array type. you can enable the set watermark through setWaterMark ().
  
/**
*
* Add a watermark to the image;
* External access to the $ msg, $ img_width, $ img_height, $ save_dir, $ img_size variable
* Get the image upload errors, path, size, and other information;
*/
Private $ uptypes = array ('image/GIF', 'image/jpg ', 'image/jpeg', 'image/png ', 'image/pjpeg '); // 'image/bmp ', 'image/x-png ');
Private $ max_file_size = 200000;
Private $ dir_folder = "../imageupload /";
Private $ water_mark = 1;
Private $ water_type = 1;
Private $ water_str = "http://www.516ya.cn ";
Private $ water_img = "xplore.gif ";
Private $ create_water = false;
Private $ overwrite = false;
  
Public $ msg = "";
Public $ img_width = 0;
Public $ img_height = 0;
Public $ save_dir = "";
Public $ img_size = 0;
Public $ sucess = false;
  
Function setWaterMark (){
$ This-> create_water = true;
}
  
Function startUpload ($ files ){
  
  
If (! Is_uploaded_file ($ files ['tmp _ name'])
{
$ This-> msg. = "The image does not exist! --";