PHP Image Watermark-Add one image as a watermark to another picture

The code is as follows:

/** * image watermark (for png/jpg/gif format) * * @param $srcImg Original image * @param $waterImg watermark image * @param $savepath Save Road Diameter * @param $savename Save name * @param $positon watermark Location: 1: Top left, 2: Top right, 3: center, 4: Bottom station left, 5: Bottom Right * @param $alpha transparency: 0 : Fully transparent, 100: completely opaque * * @return Success-Watermark New image address * failed---1: Original file does not exist,-2: Watermark image does not exist,-3: Original file image object failed to build,-4: Watermark file Image object failed to build -5: New image save failed after watermark*/    functionWater_mark ($srcImg,$waterImg,$savepath=NULL,$savename=NULL,$positon=1,$alpha=50){        //determine if a file exists        $srcImgInfo= @getimagesize($srcImg); if(!$srcImgInfo){            return-1; }        $waterImgInfo= @getimagesize($waterImg); if(!$waterImgInfo){            return-1; }        //Creating an Image object        $SRCIMGOBJ= Image_create_from_ext ($srcImg,$srcImgInfo[2]); if(!$SRCIMGOBJ){            return-3;//The original file image object failed to build        }        $WATERIMGOBJ= Image_create_from_ext ($waterImg,$waterImgInfo[2]); if(!$WATERIMGOBJ){            return-4;//The original file image object failed to build        }        //Preparation Information: Save path, save file name        $temp=PathInfo($srcImg); $name=$temp[' basename ']; $path=$temp[' DirName ']; $ext=$temp[' extension ']; $savename=$savename?$savename:$name; $savepath=$savepath?$savepath:$path; $savefile=$savepath.‘ /‘.$savename; //determine where the watermark is generated        Switch($positon){            //1 Top left             Case1:$x=$y=0;  Break; //2 top Right             Case2:$x=$srcImgInfo[0]-$waterImgInfo[0];$y= 0;  Break; //3 Centering             Case3:$x= ($srcImgInfo[0]-$waterImgInfo[0]) /2;$y= ($srcImgInfo[1]-$waterImgInfo[1]) /2;  Break; //4 Bottom Left             Case4:$x= 0;$y=$srcImgInfo[1]-$waterImgInfo[1];  Break; //5 Bottom Right             Case5:$x=$srcImgInfo[0]-$waterImgInfo[0];$y=$srcImgInfo[1]-$waterImgInfo[1];  Break; default:$x=$y=0; }        //Add a watermark pictureImagecopymerge ($SRCIMGOBJ,$WATERIMGOBJ,$x,$y, 0, 0,$srcImgInfo[0]/2,$srcImgInfo[1]/2,$alpha); //Output Picture        Switch($srcImgInfo[2]) {             Case1:Imagegif ($SRCIMGOBJ,$savefile);  Break;  Case2:imagejpeg ($SRCIMGOBJ,$savefile);  Break;  Case3:Imagepng ($SRCIMGOBJ,$savefile);  Break; default:return-5;//Save failed        }        //Destroying image ResourcesImagedestroy ($SRCIMGOBJ); Imagedestroy ($WATERIMGOBJ); return $savefile; }    /** Create Image Object * @param $imgFile picture path * @param $imgExt picture extension * @return $im Image Object **/    functionImage_create_from_ext ($imgFile,$imgExt){        $im=NULL; Switch($imgExt) {             Case1:$im=imagecreatefromgif ($imgFile);  Break;  Case2:$im=imagecreatefromjpeg ($imgFile);  Break;  Case3:$im=imagecreatefrompng ($imgFile);  Break; }        return $im; }

Call Method:

// Call Test    $res null, ' res.jpg ');     Var_dump ($res);

PHP Image Watermark-Add one image as a watermark to another picture