PHP to add a watermark to the image of the specific implementation

To add a watermark to the image implementation method is as follows:

1 classMark2 {3      Public function__construct ()4     {5  6     }7  8 /**9 * Add WatermarkTen * @param file $srcImg image to be watermarked One * @param file $waterImg watermark image A * @param integer $position watermark picture placement 1: Top left, 2: Top right, 3: center, 4: Lower left, 5: lower right - * @param integer $alpha watermark picture Transparency 0-100 - * @return Resource Returns the image resource after Watermark the  */ -      Public functionWaterMark ($srcImg,$waterImg,$position=5,$alpha) -     { -         /** + * Obtain the width and height of the original image and Watermark (px) - * @var [type] +          */ A         $srcImgInfo= @getimagesize($srcImg); at         if(!$srcImgInfo)return FALSE; -         $srcW=$srcImgInfo[0]; -         $srcH=$srcImgInfo[1]; -   -         $waterInfo= @getimagesize($waterImg); -         if(!$waterInfo)return FALSE;//watermark picture does not exist or path error in         $waterW=$waterInfo[0];//width -         $waterH=$waterInfo[1];//Height to   +   -         /** the * Generate Image Resources * * @var [type] $          */Panax Notoginseng         $SRCIMGOBJ=$this->imagecreatefromext ($srcImg); -         if(!$SRCIMGOBJ)return FALSE; the   +         $WATERIMGOBJ=$this->imagecreatefromext ($waterImg); A         if(!$WATERIMGOBJ)return FALSE; the         //calculate the location of the watermark +         Switch($position) -         { $         //1 Top left $          Case1: -             $srcX=$srcY= 0; -              Break; the         //2 top Right -          Case2:Wuyi             $srcX=$srcW-$waterW; the             $srcY= 0; -              Break; Wu         //3 Centering -          Case3: About             $srcX= ($srcW-$waterW)/2; $             $srcY= ($srcH-$waterH)/2; -              Break; -         //4 Bottom Left -          Case4: A             $srcX= 0; +             $srcY=$srcH-$waterH; the              Break; -         //5 Bottom Right $          Case5: the             $srcX=$srcW-$waterW; the             $srcY=$srcH-$waterH; the              Break; the         default: -             $srcX=$srcY= 0; in         } the         //merging original and watermark images theImagecopymerge ($SRCIMGOBJ,$WATERIMGOBJ,$srcX,$srcY, 0, 0,$waterW,$waterH,$alpha); AboutImagedestroy ($WATERIMGOBJ);//Close the Watermark image resource the //Returns the merged image resource, which can be exported directly to the browser or saved as a picture file after the external image resource is obtained . the         return $SRCIMGOBJ; the         } +   -     /** the * Create new image resources based on the original format providedBayi * @param file $imgfile the * @return ambigous <null, resource> the     */ -     Private functionImagecreatefromext ($imgfile) -     { the         //get the format of the picture; Format: 1, gif,2, jpg,3, PNG the         $imageType=getimagesize($imgfile) [2]; the         $im=NULL; the         Switch($imageType) { -          Case1: the             $im= Imagecreatefromgif ($imgfile); the              Break; the          Case2:94             $im= Imagecreatefromjpeg ($imgfile); the              Break; the          Case3: the             $im= Imagecreatefrompng ($imgfile);98              Break; About         default: -             $im= Imagecreatefrompng ($imgfile);101         }102         return $im;103     }104}