PHP實現的給圖片添加水印功能，可添加文字水印或圖片水印，使用文字水印時需要提供字體文件，使用圖片水印時需要提供水印圖片，水印圖片不能比要添加水印的圖片大，請使用背景透明的水印圖片。

該水印類支持自定義水印位置、自定義水印大小和水印的透明度，字體水印可自定義顏色等，功能已相應完善。

完整源代碼如下(注解中已給出使用示例)：

/**

* 圖片加水印類，支持文字水印、透明度設置、自定義水印位置等。

* 使用示例：

* $obj = new WaterMask($imgFileName); //實例化對象

* $obj->$waterType = 1; //類型：0為文字水印、1為圖片水印

* $obj->$transparent = 45; //水印透明度

* $obj->$waterStr = 'www.jb51.net'; //水印文字

* $obj->$fontSize = 18; //文字字體大小

* $obj->$fontColor = array(255,255,255); //水印文字顏色(RGB)

* $obj->$fontFile = 'AHGBold.ttf'; //字體文件

* ……

* $obj->output(); //輸出水印圖片文件覆蓋到輸入的圖片文件

*/

class WaterMask{

public $waterType = 0; //水印類型：0為文字水印、1為圖片水印

public $pos = 0; //水印位置

public $transparent = 45; //水印透明度

public $waterStr = 'www.jb51.net'; //水印文字

public $fontSize = 18; //文字字體大小

public $fontColor = array(255,255,255); //水印文字顏色(RGB)

public $fontFile = 'AHGBold.ttf'; //字體文件

public $waterImg = 'logo.png'; //水印圖片

private $srcImg = ''; //需要添加水印的圖片

private $im = ''; //圖片句柄

private $water_im = ''; //水印圖片句柄

private $srcImg_info = ''; //圖片信息

private $waterImg_info = ''; //水印圖片信息

private $str_w = ''; //水印文字寬度

private $str_h = ''; //水印文字高度

private $x = ''; //水印X坐標

private $y = ''; //水印y坐標

function __construct($img) { //析構函數

$this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');

}

private function imginfo() { //獲取需要添加水印的圖片的信息，并載入圖片。

$this->srcImg_info = getimagesize($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('原圖片('.$this->srcImg.')格式不對，只支持PNG、JPEG、GIF。');

}

}

private function waterimginfo() { //獲取水印圖片的信息，并載入圖片。

$this->waterImg_info = getimagesize($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('水印圖片('.$this->srcImg.')格式不對，只支持PNG、JPEG、GIF。');

}

}

private function waterpos() { //水印位置算法

switch ($this->pos) {

case 0: //隨機位置

$this->x = rand(0,$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] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){

die('水印比原圖大！');

}

$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('添加水印失敗！');

break;

}

imagedestroy($this->im);

imagedestroy($this->water_im);

}

}

?>

總結

以上就是這篇文章的全部內容了，希望本文的內容對大家的學習或者工作具有一定的參考學習價值，謝謝大家對腳本之家的支持。如果你想了解更多相關內容請查看下面相關鏈接

總結

以上是生活随笔為你收集整理的php加图片源码_PHP添加文字水印或图片水印的水印类完整源代码与使用示例的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。