php 使用GD库为页面增加水印

 <?phpheader ("Content-type: image/png");$conn = mysql_connect("localhost", "root", "");//连接数据库$colname_rs_article = $_GET['id'];//获取参数idmysql_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 browserImageDestroy($logo);ImageDestroy($image);?>