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给图片添加水印的PHP类

时间：2021-07-01 10:21:17 帮助过：16人阅读

支持文字水印、图片水印支持水印的位置随机或固定（九宫格）水印透明度设置（图片水印和文字水印都支持）文字 水印的字体、颜色、大小设置图片水印的背景透明
  1. /**
  2. * 加水印类，支持文字图片水印的透明度设置、水印图片背景透明。
  3. * 日期：2011-09-27
  4. * 作者：www.itwhy.org
  5. * 使用：
  6. * $obj = new WaterMask($imgFileName); //实例化对象
  7. * $obj->$waterType = 1; //类型：0为文字水印、1为图片水印
  8. * $obj->$transparent = 45; //水印透明度
  9. * $obj->$waterStr = 'www.itwhy.org'; //水印文字
  10. * $obj->$fontSize = 16; //文字字体大小
  11. * $obj->$fontColor = array(255,0255); //水印文字颜色（RGB）
  12. * $obj->$fontFile = = 'AHGBold.ttf'; //字体文件
  13. * $obj->output(); //输出水印图片文件覆盖到输入的图片文件
  14. */
  15. class WaterMask{
  16. public $waterType = 1; //水印类型：0为文字水印、1为图片水印
  17. public $pos = 0; //水印位置
  18. public $transparent = 45; //水印透明度
  20. public $waterStr = 'www.itwhy.org'; //水印文字
  21. public $fontSize = 16; //文字字体大小
  22. public $fontColor = array(255,0,255); //水印文字颜色（RGB）
  23. public $fontFile = 'AHGBold.ttf'; //字体文件
  25. public $waterImg = 'logo.png'; //水印图片
  27. private $srcImg = ''; //需要添加水印的图片
  28. private $im = ''; //图片句柄
  29. private $water_im = ''; //水印图片句柄
  30. private $srcImg_info = ''; //图片信息
  31. private $waterImg_info = ''; //水印图片信息
  32. private $str_w = ''; //水印文字宽度
  33. private $str_h = ''; //水印文字高度
  34. private $x = ''; //水印X坐标
  35. private $y = ''; //水印y坐标
  37. function __construct($img) { //析构函数
  38. $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');
  39. }
  40. private function imginfo() { //获取需要添加水印的图片的信息，并载入图片。
  41. $this->srcImg_info = getimagesize($this->srcImg);
  42. switch ($this->srcImg_info[2]) {
  43. case 3:
  44. $this->im = imagecreatefrompng($this->srcImg);
  45. break 1;
  46. case 2:
  47. $this->im = imagecreatefromjpeg($this->srcImg);
  48. break 1;
  49. case 1:
  50. $this->im = imagecreatefromgif($this->srcImg);
  51. break 1;
  52. default:
  53. die('原图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
  54. }
  55. }
  56. private function waterimginfo() { //获取水印图片的信息，并载入图片。
  57. $this->waterImg_info = getimagesize($this->waterImg);
  58. switch ($this->waterImg_info[2]) {
  59. case 3:
  60. $this->water_im = imagecreatefrompng($this->waterImg);
  61. break 1;
  62. case 2:
  63. $this->water_im = imagecreatefromjpeg($this->waterImg);
  64. break 1;
  65. case 1:
  66. $this->water_im = imagecreatefromgif($this->waterImg);
  67. break 1;
  68. default:
  69. die('水印图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
  70. }
  71. }
  72. private function waterpos() { //水印位置算法
  73. switch ($this->pos) {
  74. case 0: //随机位置
  75. $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
  76. $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
  77. break 1;
  78. case 1: //上左
  79. $this->x = 0;
  80. $this->y = 0;
  81. break 1;
  82. case 2: //上中
  83. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  84. $this->y = 0;
  85. break 1;
  86. case 3: //上右
  87. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  88. $this->y = 0;
  89. break 1;
  90. case 4: //中左
  91. $this->x = 0;
  92. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  93. break 1;
  94. case 5: //中中
  95. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  96. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  97. break 1;
  98. case 6: //中右
  99. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  100. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  101. break 1;
  102. case 7: //下左
  103. $this->x = 0;
  104. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  105. break 1;
  106. case 8: //下中
  107. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  108. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  109. break 1;
  110. default: //下右
  111. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  112. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  113. break 1;
  114. }
  115. }
  116. private function waterimg() {
  117. if ($this->srcImg_info[0] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){
  118. die('水印比原图大！');
  119. }
  120. $this->waterpos();
  121. $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
  122. imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
  123. $pct = $this->transparent;
  124. imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
  125. imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
  126. }
  127. private function waterstr() {
  128. $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
  129. $w = abs($rect[2]-$rect[6]);
  130. $h = abs($rect[3]-$rect[7]);
  131. $fontHeight = $this->fontSize;
  132. $this->water_im = imagecreatetruecolor($w, $h);
  133. imagealphablending($this->water_im,false);
  134. imagesavealpha($this->water_im,true);
  135. $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
  136. imagefill($this->water_im,0,0,$white_alpha);
  137. $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
  138. imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
  139. $this->waterImg_info = array(0=>$w,1=>$h);
  140. $this->waterimg();
  141. }
  142. function output() {
  143. $this->imginfo();
  144. if ($this->waterType == 0) {
  145. $this->waterstr();
  146. }else {
  147. $this->waterimginfo();
  148. $this->waterimg();
  149. }
  150. switch ($this->srcImg_info[2]) {
  151. case 3:
  152. imagepng($this->im,$this->srcImg);
  153. break 1;
  154. case 2:
  155. imagejpeg($this->im,$this->srcImg);
  156. break 1;
  157. case 1:
  158. imagegif($this->im,$this->srcImg);
  159. break 1;
  160. default:
  161. die('添加水印失败！');
  162. break;
  163. }
  164. imagedestroy($this->im);
  165. imagedestroy($this->water_im);
  166. }
  167. }
  168. ?>

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