


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:
//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) );
$imgpreviewsize=1/2; //Thumbnail ratio
?>
head>
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
if (!is_uploaded_file($_FILES["upfile"]
[tmp_name]))
//Whether the file exists
{
echo "The picture does not exist!";
exit;
}
$file = $_FILES["upfile"];
if($max_file_size <$file["size"])
//Check file size
{
echo "The file is too big!";
exit;
}
if(!in_array($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 "The file with the same name already exists";
exit;
}
if(!move_uploaded_file ($filename,
$destination))
{
echo "Error moving file";
exit;
}
$pinfo=pathinfo($destination);
$fname=$pinfo[basename];
echo " Uploaded successfully
File name:
".$destination_folder.
$fname." font>
";
echo " width:".$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,0,0,0);
$red=imagecolorallocate($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 type");
exit;
}
imagecopy($nimage,$simage,0,0,0,0,
$image_size[0],$image_size[1 ]);
imagefilledrectangle($nimage,1,
$image_size[1]-15,80,$image_size[1],$white);
switch($watertype)
{
case 1: //Add watermark string
imagestring($nimage,2,3,$image_size[1]-15,
$waterstring,$black);
break;
case 2 : //Watermark image
$simage1 =imagecreatefromgif("xplore.gif");
imagecopy($nimage,$simage1,0,0,0,0,85,15);
imagedestroy( $simage1);
break;
}
switch ($iinfo[2])
{
case 1:
//imagegif($nimage, $destination);
imagejpeg($nimage, $destination);
break;
case 2:
imagejpeg($nimage, $destination);
break;
case 3:
imagepng($ nimage, $destination);
break;
case 6:
imagewbmp($nimage, $destination);
//imagejpeg($nimage, $destination);
break;
}
//Overwrite the original uploaded file
imagedestroy($nimage);
imagedestroy($simage);
}
if($imgpreview==1)
{
echo "
Image preview:
";
echo "
echo " alt="Image preview:rFile name:".
$destination."rUpload time:" />";
}
}
?>
You can also refer to the PHP class for adding watermarks to pictures

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