PHP example: add a watermark to the uploaded image

The program that uses php (as the mainstream development language) to add a watermark to an uploaded image creates a graph by determining the file type, copies it to the original graph, fills in the image, and creates a rectangle, for writing to imagestring () or determining the watermark type in the original image program: one is a string, and the other is to add a SyntaxHighlighter

The program that uses php (as the mainstream development language) to add a watermark to an uploaded image creates a graph by determining the file type, copies it to the original graph, fills in the image, and creates a rectangle, for writing to imagestring () or determining the watermark type in the original image program: one is a string, and the other is to add a graphic object on it. If you are familiar with the GD library of php (as the mainstream development language), it is not difficult to understand this article!

The following is a reference clip:

/*************************************** **************
Parameter description:
$ Max_file_size: size limit of the uploaded file, in bytes
$ Destination_folder: File Upload path
$ Watermark: whether to add a watermark. (1 indicates adding a watermark; others indicates not adding a watermark );
Instructions for use:
1. use php (as the mainstream development language ). the "extension = php (as the mainstream development language) _ gd2.dll" line in the INI file is removed because the GD library is used;
2. change extension_dir = to the directory where your php (as the mainstream development language) _ gd2.dll is located;
3. http://www.knowsky.com/php (as the mainstream development language). asp;
**************************************** ************/
// Upload file type list
$ Uptypes = array (
Image/jpg,
Image/jpeg,
Image/png,
Image/pjpeg,
Image/gif,
Image/bmp,
Image/x-png
);
$ Max_file_size = 2000000; // size limit of uploaded files, in bytes
$ Destination_folder = "uploadimg/"; // file Upload path
$ Watermark = 1; // whether to add a watermark. (1 indicates adding a watermark. otherwise, no watermark is added );
$ Watertype = 1; // watermark type (1 is text, 2 is image)
$ Waterposition = 1; // watermark position (1 indicates the lower left corner, 2 indicates the lower right corner, 3 indicates the upper left corner, 4 indicates the upper right corner, and 5 indicates the center );
$ Waterstring = "http://www.xplore.cn/"; // watermark string
$ Waterimg = "xplore.gif"; // watermark image
$ Imgpreview = 1; // whether to generate a preview image (1 is generated, others are not generated );
$ Imgpreviewsize = 1/2; // Thumbnail ratio
?>


ZwelL image upload program




If ($ _ SERVER [REQUEST_METHOD] = POST)
{
If (! Is_uploaded_file ($ _ FILES ["upfile"] [tmp_name])
// Whether a file exists
{
Echo "the image does not exist! ";
Exit;
}
$ File = $ _ FILES ["upfile"];
If ($ max_file_size <$ file ["size"])
// Check the file size
{
Echo "the file is too large! ";
Exit;
}
If (! In_array ($ file ["type"], $ uptypes ))
// Check the file type
{
Echo "file type does not match! ". $ File [" type "];
Exit;
}
If (! File_exists ($ destination_folder ))
{
Mkdir ($ destination_folder );
}
$ Filename = $ file ["tmp_name"];
$ Image_size = getimagesize ($ filename );
$ Pinfo = pathinfo ($ file ["name"]);
$ Ftype = $ pinfo [extension];
$ Destination = $ destination_folder.time (). ".". $ ftype;
If (file_exists ($ destination) & $ overwrite! = True)
{
Echo "a file with the same name already exists ";
Exit;
}
If (! Move_uploaded_file ($ filename, $ destination ))
{
Echo "an error occurred while moving the file ";
Exit;
}
$ Pinfo = pathinfo ($ destination );
$ Fname = $ pinfo [basename];
Echo "uploaded successfully
File name: ". $ destination_folder. $ fname ."
";
Echo "width:". $ image_size [0];
Echo "length:". $ image_size [1];
Echo"
Size: ". $ file [" size "]." bytes ";
If ($ watermark = 1)
{
$ Iinfo = getimagesize ($ destination, $ iinfo );
$ Nimage = imagecreatetruecolor ($ image_size [0], $ image_size [1]);
$ White = imagecolorallocate ($ nimage, 255,255,255 );
$ Black = imagecolorallocate ($ nimage, 0, 0 );
$ Red = imagecolorallocate ($ nimage, 255, 0, 0 );
Imagefill ($ nimage, 0, 0, $ white );
Switch ($ iinfo [2])
{
Case 1:
$ Simage = imagecreatefromgif ($ destination );
Break;
Case 2:
$ Simage = imagecreatefromjpeg ($ destination );
Break;
Case 3:
$ Simage = imagecreatefrompng ($ destination );
Break;
Case 6:
$ Simage = imagecreatefromwbmp ($ destination );
Break;
Default:
Die ("unsupported file types ");
Exit;
}
Imagecopy ($ nimage, $ simage, 0, 0, 0, $ image_size [0], $ image_size [1]);
Imagefilledrectangle ($ nimage, 1