php 使用GD库为页面增加水印示例代码

代码如下：

<?php 
header ("Content-type: image/png"); 
$conn = MYSQL_connect("localhost", "root", ""); //连接数据库 
$colname_rs_article = $_GET['id']; //获取参数id 

mysql_select_db("cms", $conn); //执行SQL 
$query_rs_article = sprintf("SELECT * FROM articles WHERE article_id = %s", $colname_rs_article); 
$rs_article = mysql_query($query_rs_article, $conn) or die(mysql_error()); 
$row_rs_article = mysql_fetch_assoc($rs_article); 
$totalRows_rs_article = mysql_num_rows($rs_article); 

$image = ImageCreateTrueColor(700, 1000); //创建画布 
$bg = ImageColorAllocate($image, 255, 255, 255); //设置背景为白色 
ImageFill($image, 0, 0, $bg); 
$text_color = ImageColorAllocate($image, 0, 0, 0); //设置文字颜色为黑色 
imagestring($image, 5, 0, 0, $row_rs_article['title'], $text_color); //输出文章标题 
imagestring($image, 3, 0, 20, $row_rs_article['author'], $text_color); //输出文章作者 
imagestring($image, 4, 0, 60, $row_rs_article['content'], $text_color); //输出文章内容 
$logo = ImageCreateFromPNG('logo.png'); //获得水印图片 
$logoW = ImageSX($logo); 
$logoH = ImageSY($logo); 
ImageCopy($image, $logo, 0, 0, 0, 0, $logoW, $logoH); //合并文字图片与水印图片 
ImageJPEG($image); // output to browser 
ImageDestroy($logo); 
ImageDestroy($image); 
?>