PHP class to add watermark to images

Supports text watermarks and picture watermarks. Supports random or fixed position of watermark (nine-square grid). Watermark transparency setting (both picture and text watermarks are supported). Set the font, color, and size of text watermark. The background of picture watermark is transparent.

/**
 * Add watermark class, support transparency setting of text and picture watermarks, and transparent background of watermark pictures.
 * Date: 2011-09-27
 * Author: www.itwhy.org
 * Usage:
 * $obj = new WaterMask($imgFileName); //Instantiate the object
 * $obj->$waterType = 1 ; //Type: 0 is text watermark, 1 is picture watermark
 * $obj->$transparent = 45; //Watermark transparency
 * $obj->$waterStr = 'www.itwhy.org'; // Watermark text
 * $obj->$fontSize = 16; //Text font size
 * $obj->$fontColor = array(255,0255); //Watermark text color (RGB)
 * $obj-> ;$fontFile = = 'AHGBold.ttf'; //Font file
 * $obj->output(); //The output watermark image file overwrites the input image file
*/
class WaterMask{
 public $waterType = 1; //Watermark type: 0 is text watermark, 1 is picture watermark
 public $pos = 0; //Watermark position
 public $transparent = 45; //Watermark transparency

 public $waterStr = 'www.itwhy.org'; //Watermark text
 public $fontSize = 16; //Text font size
 public $fontColor = array(255,0,255); // Watermark text color (RGB)
 public $fontFile = 'AHGBold.ttf'; //Font file

 public $waterImg = 'logo.png'; //Watermark image

 private $srcImg = ''; //Need to add Watermarked picture
 private $im = ''; //Picture handle
 private $water_im = ''; //Watermarked picture handle
 private $srcImg_info = ''; //Picture information
 private $waterImg_info = ''; // Watermark image information
 private $str_w = ''; //Watermark text width
 private $str_h = ''; //Watermark text height
 private $x = ''; //Watermark X coordinate
 private $y = ''; //Watermark y coordinate

 function __construct($img) { //Destructor
 $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" The source file is not exist! ');
 }
 private function imginfo() { //Get information about the image that needs to be watermarked and load the image.
 $this->srcImg_info = getimagesize($this->srcImg);
 switch ($this->srcImg_info[2]) {
 case 3:
 $this->im = imagecreatefrompng($this-> ;srcImg);
 break 1;
 case 2:
 $this->im = imagecreatefromjpeg($this->srcImg);
 break 1;
 case 1:
 $this->im = imagecreatefromgif($this ->srcImg);
 break 1;
 default:
 die('The original image ('.$this->srcImg.') is in the wrong format, only supports PNG, JPEG, and GIF.');
 }
 }
 private function waterimginfo() { //Get the information of the watermark image and load the image.
 $this->waterImg_info = getimagesize($this->waterImg);
 switch ($this->waterImg_info[2]) {
 case 3:
 $this->water_im = imagecreatefrompng($this-> ;waterImg);
 break 1;
 case 2:
 $this->water_im = imagecreatefromjpeg($this->waterImg);
 break 1;
 case 1:
 $this->water_im = imagecreatefromgif($this ->waterImg);
 break 1;
 default:
 die('The watermark image ('.$this->srcImg.') is in the wrong format and only supports PNG, JPEG, and GIF.');
        }
    }
    private function waterpos() {               //水印位置算法
        switch ($this->pos) {
            case 0:     //随机位置
                $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
                $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
                break 1;
            case 1:     //上左
                $this->x = 0;
                $this->y = 0;
                break 1;
            case 2:     //上中
                $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
                $this->y = 0;
                break 1;
            case 3:     //上右
                $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
                $this->y = 0;
                break 1;
            case 4:     //中左
                $this->x = 0;
                $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
                break 1;
            case 5:     //中中
                $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
                $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
                break 1;
            case 6:     //中右
                $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
                $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
                break 1;
            case 7:     //下左
                $this->x = 0;
                $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
                break 1;
            case 8:     //下中
                $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
                $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
                break 1;
            default:    //下右
                $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
                $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
                break 1;
        }
    }
    private function waterimg() {
        if ($this->srcImg_info[0] waterImg_info[0] || $this->srcImg_info[1] waterImg_info[1]){
            die('水印比原图大！');
        }
        $this->waterpos();
        $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
        imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
        $pct = $this->transparent;
        imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
        imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
    }
    private function waterstr() {
        $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
        $w = abs($rect[2]-$rect[6]);
        $h = abs($rect[3]-$rect[7]);
        $fontHeight = $this->fontSize;
        $this->water_im = imagecreatetruecolor($w, $h);
        imagealphablending($this->water_im,false);
        imagesavealpha($this->water_im,true);
        $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
        imagefill($this->water_im,0,0,$white_alpha);
        $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
        imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
        $this->waterImg_info = array(0=>$w,1=>$h);
        $this->waterimg();
    }
    function output() {
        $this->imginfo();
        if ($this->waterType == 0) {
            $this->waterstr();
        }else {
            $this->waterimginfo();
            $this->waterimg();
        }
        switch ($this->srcImg_info[2]) {
            case 3:
                imagepng($this->im,$this->srcImg);
                break 1;
            case 2:
                imagejpeg($this->im,$this->srcImg);
                break 1;
            case 1:
                imagegif($this->im,$this->srcImg);
                break 1;
            default:
                die('添加水印失败！');
                break;
        }
        imagedestroy($this->im);
        imagedestroy($this->water_im);
    }
}
?>

PHP