An enhanced version of php watermark code

/*
* Function: PHP image watermark (watermark supports images or text)
* Parameters:
* $groundImage background image, that is, the image that needs to be watermarked, temporarily Only supports GIF, JPG, PNG formats;
* $waterPos watermark position, there are 10 states, 0 is a random position;
* 1 is top left, 2 is top center, 3 is top right;
* 4 is middle left , 5 means middle center, 6 means middle right;
* 7 means bottom left, 8 means bottom center, 9 means bottom right;
* $waterImage image watermark, that is, the image used as a watermark, currently only supports GIF , JPG, PNG format;
* $waterText text watermark, that is, text is used as a watermark, supports ASCII code, does not support Chinese;
* $textFont text size, the value is 1, 2, 3, 4 or 5, the default is 5 ;
* $textColor text color, the value is a hexadecimal color value, the default is #FF0000 (red);
*
* Note: Support GD 2.0, Support FreeType, GIF Read, GIF Create, JPG, PNG
* $ It is best not to use waterImage and $waterText at the same time. Just choose one of them, and use $waterImage first.
* When $waterImage is valid, the parameters $waterString, $stringFont, and $stringColor are not valid.
* The file name of the watermarked image is the same as $groundImage.
* Author: longware
*/
function imageWaterMark($groundImage,$waterPos=9,$waterImage=”",$waterText=””,$textFont=5,$textColor=”#FF0000″)
{
$isWaterImage = FALSE;
$formatMsg = "This file format is not supported yet. Please use image processing software to convert the image to GIF, JPG, or PNG format.”;
//Read watermark file
if(!empty($waterImage) && file_exists($waterImage))
{
$isWaterImage = TRUE;
$water_info = getimagesize($waterImage);
$water_w = $water_info[ 0];//Get the width of the watermark image
$water_h = $water_info[1];//Get the height of the watermark image
switch($water_info[2])//Get the format of the watermark image
{
case 1:$ water_im = imagecreatefromgif($waterImage);break;
case 2:$water_im = imagecreatefromjpeg($waterImage);break;
case 3:$water_im = imagecreatefrompng($waterImage);break;
default:die($formatMsg);
 }
}
//Read the background image
if(!empty($groundImage) && file_exists($groundImage))
{
$ground_info = getimagesize($groundImage);
$ground_w = $ground_info[0];// Get the width of the background image
$ground_h = $ground_info[1];//Get the height of the background image
switch($ground_info[2])//Get the format of the background image
{
case 1:$ground_im = imagecreatefromgif($ groundImage);break;
case 2:$ground_im = imagecreatefromjpeg($groundImage);break;
case 3:$ground_im = imagecreatefrompng($groundImage);break;
default:die($formatMsg);
}
}
else
{
die("The picture that needs to be watermarked does not exist!");
}
//Watermark location
if($isWaterImage)//Picture watermark
{
$w = $water_w;
$h = $water_h;
$label = "Picture";
}
else//Text watermark
{
$temp = imagettfbbox(ceil($textFont*2.5),0,"simfang.ttf",$waterText);//Get using TrueType Range of font text
$w = $temp[2] – $temp[6];
$h = $temp[3] – $temp[7];
unset($temp);
$label = “Text Area";
}
if( ($ground_w<$w) || ($ground_h<$h) )
{
echo "The length or width of the image that needs to be watermarked is smaller than the watermark ".$label.", Unable to generate watermark! ”;
return;
}
switch($waterPos)
{
case 0://random
$posX = rand(0,($ground_w – $w));
$posY = rand(0,($ground_h – $h));
break;
case 1://1 means top left
$posX = 0;
$posY = 0;
break;
case 2://2 means top center
$posX = ($ ground_w – $w) / 2;
$posY = 0;
break;
case 3://3 is top right
$posX = $ground_w – $w;
$posY = 0;
break;
case 4 ://4 means center left
$posX = 0;
$posY = ($ground_h – $h) / 2;
break;
case 5://5 means center center
$posX = ($ground_w – $w ) / 2;
$posY = ($ground_h – $h) / 2;
break;
case 6://6 is the middle right
$posX = $ground_w – $w;
$posY = ($ground_h – $h) / 2;
break;
case 7://7 means the bottom is on the left
$posX = 0;
$posY = $ground_h – $h;
break;
case 8://8 means the bottom is in the center
$posX = ($ground_w – $w) / 2;
$posY = $ground_h – $h;
break;
case 9://9 is bottom right
$posX = $ground_w – $w;
 $posY = $ground_h – $h;
break;
default://random
$posX = rand(0,($ground_w – $w));
$posY = rand(0,($ground_h – $h) );
break;
}
//Set the image blending mode
imagealphablending($ground_im, true);
if($isWaterImage)//Image watermark
{
imagecopy($ground_im, $water_im, $posX, $ posY, 0, 0, $water_w,$water_h);//Copy watermark to target file
}
else//Text watermark
{
if( !empty($textColor) && (strlen($textColor)==7) )
{
$R = hexdec(substr($textColor,1,2));
$G = hexdec(substr($textColor,3,2));
$B = hexdec(substr($textColor,5) );
}
else
{
die("The watermark text color format is incorrect! ”);
}
//$waterText=iconv('utf-8′,'gbk',$waterText);
imagestring ( $ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
}
//Generate the watermarked image
@unlink($groundImage);
switch($ground_info[2])//Get the format of the background image
{
case 1 :imagegif($ground_im,$groundImage);break;
case 2:imagejpeg($ground_im,$groundImage);break;
case 3:imagepng($ground_im,$groundImage);break;
default:die($errorMsg) ;
}
//Release memory
if(isset($water_info)) unset($water_info);
if(isset($water_im)) imagedestroy($water_im);
unset($ground_info);
imagedestroy($ground_im );
}
//------------------
if(isset($_FILES) && !empty($_FILES[' userfile']) && $_FILES['userfile']['size']>0)
{
$uploadfile = “./”.time().”_”.$_FILES['userfile']['name '];
if (copy($_FILES['userfile']['tmp_name'], $uploadfile))
{
echo "OK
";
//Text watermark
imageWaterMark($uploadfile,9,"Noname. gif”,”www.nj-kingsway.com “,5,”#FF0000″);
//Image watermark
//$waterImage=”./Hanweb_shuiyin.gif”;//Watermark image path
//imageWaterMark( $uploadfile,0,$waterImage);
echo ““;
}
else
{
echo “Fail
“;
}
}
?>