Location: PHPKode > projects > Monolith Personal CMS > include/watermark.php
<?php 
/* 
* 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); 
* 
* 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<$w) || ($ground_h<$h) ) 
    { 
        echo "需要加水印的图片的长度或宽度比水印".$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); 
}
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