php实现图片添加水印功能

复制代码 代码如下:

function img_water_mark($srcImg, $waterImg, $savepath=null, $savename=null, $positon=5, $alpha=30)
{
    $temp = pathinfo($srcImg);
    $name = $temp['basename'];
    $path = $temp['dirname'];
    $exte = $temp['extension'];
    $savename = $savename ? $savename : $name;
    $savepath = $savepath ? $savepath : $path;
    $savefile = $savepath .'/'. $savename;
    $srcinfo = @getimagesize($srcImg);
    if (!$srcinfo) {
        return -1; //原文件不存在
    }
    $waterinfo = @getimagesize($waterImg);
    if (!$waterinfo) {
        return -2; //水印图片不存在
    }
    $srcImgObj = image_create_from_ext($srcImg);
    if (!$srcImgObj) {
        return -3; //原文件图像对象建立失败
    }
    $waterImgObj = image_create_from_ext($waterImg);
    if (!$waterImgObj) {
        return -4; //水印文件图像对象建立失败
    }
    switch ($positon) {
    //1顶部居左
    case 1: $x=$y=0; break;
    //2顶部居右
    case 2: $x = $srcinfo[0]-$waterinfo[0]; $y = 0; break;
    //3居中
    case 3: $x = ($srcinfo[0]-$waterinfo[0])/2; $y = ($srcinfo[1]-$waterinfo[1])/2; break;
    //4底部居左
    case 4: $x = 0; $y = $srcinfo[1]-$waterinfo[1]; break;
    //5底部居右
    case 5: $x = $srcinfo[0]-$waterinfo[0]; $y = $srcinfo[1]-$waterinfo[1]; break;
    default: $x=$y=0;
    }
    imagecopymerge($srcImgObj, $waterImgObj, $x, $y, 0, 0, $waterinfo[0], $waterinfo[1], $alpha);
    switch ($srcinfo[2]) {
    case 1: imagegif($srcImgObj, $savefile); break;
    case 2: imagejpeg($srcImgObj, $savefile); break;
    case 3: imagepng($srcImgObj, $savefile); break;
    default: return -5; //保存失败
    }
    imagedestroy($srcImgObj);
    imagedestroy($waterImgObj);
    return $savefile;
}

function image_create_from_ext($imgfile)
{
    $info = getimagesize($imgfile);
    $im = null;
    switch ($info[2]) {
    case 1: $im=imagecreatefromgif($imgfile); break;
    case 2: $im=imagecreatefromjpeg($imgfile); break;
    case 3: $im=imagecreatefrompng($imgfile); break;
    }
    return $im;
}