PHP pictures automatically add watermark code, PHP picture watermark function code

/*
* Function: php image watermark (watermark supports images or text)
* Parameters:
*$groundimage background image, that is, the image that needs to be watermarked, currently only supports gif, jpg , png format;
*$waterpos watermark position, there are 10 states, 0 is a random position;
*1 is the top left, 2 is the top center, 3 is the top right;
*4 is the middle left, 5 is the middle center , 6 means the middle is on the right;
*7 means the bottom is on the left, 8 is the bottom is in the center, 9 is the bottom is on the right;
*$waterimage image watermark, that is, the image used as the watermark, currently only supports gif, jpg, and png formats ;
*$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
*$waterimage and $watertext are the most It is best not to use them 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 $groundimage.
* Author: longware @ 2004-11-3 14:15:13
*/
function imagewatermark($groundimage,$waterpos=0,$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($formatmsg);
}
}
else
{
die("The picture that needs to be watermarked does not exist!");
}
//Watermark position
if($iswaterimage)//Picture watermark
{
$w = $water_w;
$h = $water_h;
$label = "Picture";
}
else//Text watermark
{
$temp = imagettfbbox(ceil($textfont*2.5),0,"./cour.ttf",$watertext);//Get Range of text using truetype font
$w = $temp[2] - $temp[6];
$h = $temp[3] - $temp[7];
unset($temp);
$label = "Text area";
}
if( ($ground_w<$w) || ($ground_h<$h) )
{
echo "The length or width of the image that needs to be watermarked is longer than the watermark ".$label." Small, 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 the 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 is bottom left
$posx = 0;
$posy = $ground_h - $h;
break;
case 8://8 is bottom 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) ; 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!");
}
imagestring ( $ground_im, $textfont, $posx, $posy, $watertext, imagecolorallocate($ground_im, $r, $g, $b));
}
//The image after generating the watermark
 @unlink($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,0,"","http://blog.csdn.net/longware/",5,"#ff0000");
//Image watermark
//$waterimage="./hanweb_shuiyin. gif";//Watermark image path
//imagewatermark($uploadfile,0,$waterimage);
echo "" ;
}
else
{
echo "fail";
}
}
?>

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