php图片水印功能代码（支持图片与文字）

/** 功能：php图片水印 (水印支持图片或文字)* 参数：* $groundimage背景图片，即需要加水印的图片，暂只支持gif,jpg,png格式；* $waterpos水印位置，有10种状态，0为随机位置；*1为顶端居左，2为顶端居中，3为顶端居右；*4为中部居左，5为中部居中，6为中部居右；*7为底端居左，8为底端居中，9为底端居右；* $waterimage图片水印，即作为水印的图片，暂只支持gif,jpg,png格式；* $watertext文字水印，即把文字作为为水印，支持ascii码，不支持中文；* $textfont文字大小，值为1、2、3、4或5，默认为5；* $textcolor文字颜色，值为十六进制颜色值，默认为#ff0000(红色)；* http://bbs.it-home.org* 注意：support gd 2.0，support freetype、gif read、gif create、jpg 、png* $waterimage 和 $watertext 最好不要同时使用，选其中之一即可，优先使用 $waterimage。* 当$waterimage有效时，参数$waterstring、$stringfont、$stringcolor均不生效。* 加水印后的图片的文件名和 $groundimage 一样。* 作者：longware @ 2004-11-3 14:15:13*/function imagewatermark($groundimage,$waterpos=0,$waterimage="",$watertext="",$textfont=5,$textcolor="#ff0000"){$iswaterimage = false;$formatmsg = "暂不支持该文件格式，请用图片处理软件将图片转换为gif、jpg、png格式。";//读取水印文件if(!empty($waterimage) && file_exists($waterimage)){$iswaterimage = true;$water_info = getimagesize($waterimage);$water_w= $water_info[0];//取得水印图片的宽$water_h= $water_info[1];//取得水印图片的高switch($water_info[2])//取得水印图片的格式{case 1:$water_im = imagecreatefromgif($waterimage);break;case 2:$water_im = imagecreatefromjpeg($waterimage);break;case 3:$water_im = imagecreatefrompng($waterimage);break;default:die($formatmsg);}}//读取背景图片if(!empty($groundimage) && file_exists($groundimage)){$ground_info = getimagesize($groundimage);$ground_w= $ground_info[0];//取得背景图片的宽$ground_h= $ground_info[1];//取得背景图片的高switch($ground_info[2])//取得背景图片的格式{case 1:$ground_im = imagecreatefromgif($groundimage);break;case 2:$ground_im = imagecreatefromjpeg($groundimage);break;case 3:$ground_im = imagecreatefrompng($groundimage);break;default:die($formatmsg);}}else{die("需要加水印的图片不存在！");}//水印位置if($iswaterimage)//图片水印{$w = $water_w;$h = $water_h;$label = "图片的";}else//文字水印{$temp = imagettfbbox(ceil($textfont*2.5),0,"./cour.ttf",$watertext);//取得使用 truetype 字体的文本的范围$w = $temp[2] - $temp[6];$h = $temp[3] - $temp[7];unset($temp);$label = "文字区域";}if( ($ground_w{echo "需要加水印的图片的长度或宽度比水印".$label."还小，无法生成水印！";return;}switch($waterpos){case 0://随机$posx = rand(0,($ground_w - $w));$posy = rand(0,($ground_h - $h));break;case 1://1为顶端居左$posx = 0;$posy = 0;break;case 2://2为顶端居中$posx = ($ground_w - $w) / 2;$posy = 0;break;case 3://3为顶端居右$posx = $ground_w - $w;$posy = 0;break;case 4://4为中部居左$posx = 0;$posy = ($ground_h - $h) / 2;break;case 5://5为中部居中$posx = ($ground_w - $w) / 2;$posy = ($ground_h - $h) / 2;break;case 6://6为中部居右$posx = $ground_w - $w;$posy = ($ground_h - $h) / 2;break;case 7://7为底端居左$posx = 0;$posy = $ground_h - $h;break;case 8://8为底端居中$posx = ($ground_w - $w) / 2;$posy = $ground_h - $h;break;case 9://9为底端居右$posx = $ground_w - $w;$posy = $ground_h - $h;break;default://随机$posx = rand(0,($ground_w - $w));$posy = rand(0,($ground_h - $h));break;}//设定图像的混色模式imagealphablending($ground_im, true);if($iswaterimage)//图片水印{imagecopy($ground_im, $water_im, $posx, $posy, 0, 0, $water_w,$water_h);//拷贝水印到目标文件}else//文字水印{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("水印文字颜色格式不正确！");}imagestring ( $ground_im, $textfont, $posx, $posy, $watertext, imagecolorallocate($ground_im, $r, $g, $b));}//生成水印后的图片@unlink($groundimage);switch($ground_info[2])//取得背景图片的格式{case 1:imagegif($ground_im,$groundimage);break;case 2:imagejpeg($ground_im,$groundimage);break;case 3:imagepng($ground_im,$groundimage);break;default:die($errormsg);}//释放内存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'], $uploadfile)){echo "OK";//文字水印imageWaterMark($uploadfile,0,"","your water text",9,"#EBEBEB");//图片水印//$waterImage="./images/watermark.gif";//水印图片路径//imageWaterMark($uploadfile,9,$waterImage);echo "";}else{echo "Fail";}}?>文件:复制代码