<?php

$file = "./01.jpg";

$imageResource = imagecreatefromjpeg($file);

 

$imgWidth = imagesx($imageResource);

$imgHeight = imagesy($imageResource);

$white = imagecolorallocate($imageResource,255,255,255);

$text = "吴华博客";

$fontfile = "STXINWEI.TTF";

$x = $imgWidth - 180;

$y = $imgHeight - 30;

imagettftext ($imageResource,30,0,$x,$y,$white,$fontfile,$text);
imagejpeg($imageResource,"watermark_01.jpg");

imagedestroy($imageResource);

?>

 
唉，这是怎么了，难道代码有错误吗？检查一遍后，没有错误呀！啊，原来是字符编码的问题！

$file = "./01.jpg";

$imageResource = imagecreatefromjpeg($file);

$imgWidth = imagesx($imageResource);

$imgHeight = imagesy($imageResource);

$white = imagecolorallocate($imageResource,255,255,255);

$text = "吴华博客";

$fontfile = "STXINWEI.TTF";

$text = iconv("gb2312","utf-8",$text);

$x = $imgWidth - 180;

$y = $imgHeight - 30;

imagettftext ($imageResource,30,0,$x,$y,$white,$fontfile,$text);
imagejpeg($imageResource,"watermark_01.jpg");

imagedestroy($imageResource);

?>

 
二、 添加Logo

我们就拿新浪的Logo为例吧！此时我们需要到imagecopymerge函数

源代码如下:

$file = "./01.jpg";

$logoFile = "./logo.gif";

$spacer = 15;

$imageResource = imagecreatefromjpeg($file);

$imgWidth = imagesx($imageResource);

$imgHeight = imagesy($imageResource);

$logoResource = imagecreatefromgif($logoFile);

$logoWidth = imagesx($logoResource);

$logoHeight = imagesy($logoResource);

imagecopymerge($imageResource,$logoResource,($imgWidth-$logoWidth-$spacer),($imgHeight-$logoHeight-$spacer),0,0,$logoWidth,$logoHeight,100);

imagejpeg($imageResource,"watermark_01.jpg");

imagedestroy($imageResource);

?>

 
三、 文件上传+生成缩略图+水印效果

操作步骤如下:

1. 创建图形化的用户界面(如下图)

 

 
2. 上传文件并添加水印

<?php

$filename = $_FILES["file"]["name"];

$tmpName = $_FILES["file"]["tmp_name"];

$errCode = $_FILES["file"]["error"];

$scalePercent = 0.5;

if($errCode == 0)

{

 list($imgWidth,$imgHeight,$imgType) = getimagesize($tmpName);

 $destWidth = ceil($imgWidth * $scalePercent);

 $destHeight = ceil($imgHeight * $scalePercent);

 $destImage = imagecreatetruecolor($destWidth,$destHeight);

 if($imgType == 1)

 {

  $createImage = "imagecreatefromgif";

  $outImage = "imagegif";

 }

 elseif ($imgType == 2)

 {

  $createImage = "imagecreatefromjpeg";

  $outImage = "imagejpeg";

 }

 elseif ($imgType == 3)

 {

  $createImage = "imagecreatefrompng";

  $outImage = "imagepng";

 }

 else

 {

  echo("文件类型错误！");

  exit;

 }

 $imageResource = $createImage($tmpName);

 imagecopyresampled($destImage,$imageResource,0,0,0,0,$destWidth,$destHeight,$imgWidth,$imgHeight);

 $text = "Wuhua Blog";

 $fontfile = "verdana.ttf";

 $x = ($destWidth - 200);

 $y = ($destHeight - 35);

 $white = imagecolorallocate($destImage,255,255,255);

 imagettftext ($destImage,20,0,$x,$y ,$white,$fontfile,$text);

 $outImage($destImage,"watermark_{$filename}");

 imagedestroy($imageResource);

 imagedestroy($destImage);

}

?>

 

具体的例子在附件中！