PHP adds watermarks to png/jpg/gif pictures

 php for the image add watermark, suitable for png/jpg/gif format pictures, you can specify the location of the watermark and the transparency of the watermark, very practical, complete code as follows: <?php/**  * image watermark (for png/jpg/gif format)  *   * @author flynetcn  *  * @param $srcImg original picture  * @param $waterImg watermark picture  * @param $savepat H Save path  * @param $savename save name  * @param $positon Watermark Location   * 1: Top left, 2: Top right, 3: center, 4: Bottom left, 5: bottom right   * param $alpha Transparency--0: Completely transparent, 100: completely opaque  *   * @return Success--Watermark New image address  *         failed-- -1: The original file does not exist,-2: Watermark picture does not exist,-3: The original file image object build failed-4: Watermark file Image Object build failed,-5: New picture after watermark Save failed  */function Img_water_mark ($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;   &NBSP $srcinfo = @getimagesize ($SRCIMG);     if (! $srcinfo) {        return-1;//original file does not exist    }     $waterinfo = @getimagesize ($WATERIMG);     if (! $waterinfo) {        return-2;//watermark image does not exist    }     $SRCIMGOBJ = Image_create_from_ext ($SRCIMG);     if (! $srcImgObj) {        return-3;//original file image Object Setup failed    }     $water Imgobj = Image_create_from_ext ($WATERIMG);     if (! $waterImgObj) {        RETURN-4//Watermark file Image Object Setup failed    }     SWI TCH ($positon) {   //1 top left     Case 1: $x = $y =0, break;    //2 top right of     Case 2: $ x = $srcinfo [0]-$waterinfo [0]; $y = 0; Break    //3 Center     Case 3: $x = ($srcinfo [0]-$waterinfo [0])/2; $y = ($srcinfo [1]-$waterinfo [1])/2; Break    //4 Bottom left     Case 4: $x = 0; $y = $srcinfo [1]-$waterinfo [1]; Break    //5 bottom right     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, $savefile); break;     Case 2:I Magejpeg ($SRCIMGOBJ, $savefile); Break     Case 3:imagepng ($SRCIMGOBJ, $savefile); Break     default:return-5; Save failed    }     Imagedestroy ($SRCIMGOBJ);     Imagedestroy ($WATERIMGOBJ);     return $savefile; function Image_create_from_ext ($imgfile) {    $info = getimagesize ($imgfile);     $im = null; &nbsp ;   Switch ($info [2]) {    Case 1: $im =imagecreatefromgif ($imgfile), break,     Case 2: $im =IMAGEC Reatefromjpeg ($imgfile); Break     Case 3: $im =imagecreatefrompng ($Imgfile); Break    }     return $im; }?>