Adding watermark to php pictures and adding watermark to uploaded pictures php class_PHP tutorial

When a regular website needs to upload pictures, it often needs to add its own website's LOGO watermark to the pictures. So how to implement this step? First, let us understand the principle of watermarking PHP images.
Create a graphic by determining the file type, then copy it to the originally created graphic, fill in and create a rectangle, ready to be written to imagestring() or to determine the watermark type in the original image program: First, string , the other is to add a graphics object on top. The following is a reprint of the PHP image with watermark!

Parameter description:

$max_file_size: upload file size limit, unit BYTE
$destination_folder: upload file path
$watermark: whether to attach a watermark (1 means adding watermark, others (To not add watermark);

Instructions for adding watermark to PHP images:
1. Remove the ; sign in front of the "extension=php_gd2.dll" line in the PHP.INI file, because we need to use it GD library;
2. Change extension_dir = to the directory where your php_gd2.dll is located;
3. http://www.jb51.net/list/list_15_1.htm
Code for watermarking PHP images Example:

Copy code The code is as follows:

//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; //Upload File size limit, unit BYTE
$destination_folder="uploadimg/"; //Upload file path
$watermark=1; //Whether to attach a watermark (1 means adding watermark, others means not adding watermark);
$watertype=1; //Watermark type (1 is text, 2 is picture)
$waterposition=1; //Watermark position (1 is the lower left corner, 2 is the lower right corner
, 3 is the upper left corner, 4 is the upper right corner, 5 is in the center);
$waterstring="
http://www.xplore.cn/< ;/A>"; //Watermark string
$waterimg="xplore.gif"; //Watermark image
$imgpreview=1; //Whether to generate a preview image (1 means generated, others will not be generated) );
$imgpreviewsize=1/2; //Thumbnail ratio
?>