php 使用GD库为页面增加水印示例代码

<?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);
?>