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php图片自动添加水印代码,php图片水印函数代码

程序员文章站 2022-06-11 21:29:54
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  1. /*
  2. * 功能:php图片水印 (水印支持图片或文字)
  3. * 参数:
  4. *$groundimage 背景图片,即需要加水印的图片,暂只支持gif,jpg,png格式;
  5. *$waterpos 水印位置,有10种状态,0为随机位置;
  6. *1为顶端居左,2为顶端居中,3为顶端居右;
  7. *4为中部居左,5为中部居中,6为中部居右;
  8. *7为底端居左,8为底端居中,9为底端居右;
  9. *$waterimage 图片水印,即作为水印的图片,暂只支持gif,jpg,png格式;
  10. *$watertext 文字水印,即把文字作为为水印,支持ascii码,不支持中文;
  11. *$textfont 文字大小,值为1、2、3、4或5,默认为5;
  12. *$textcolor 文字颜色,值为十六进制颜色值,默认为#ff0000(红色);
  13. *
  14. * 注意:support gd 2.0,support freetype、gif read、gif create、jpg 、png
  15. *$waterimage 和 $watertext 最好不要同时使用,选其中之一即可,优先使用 $waterimage。
  16. *当$waterimage有效时,参数$waterstring、$stringfont、$stringcolor均不生效。
  17. *加水印后的图片的文件名和 $groundimage 一样。
  18. * 作者:longware @ 2004-11-3 14:15:13
  19. */
  20. function imagewatermark($groundimage,$waterpos=0,$waterimage="",$watertext="",$textfont=5,$textcolor="#ff0000")
  21. {
  22. $iswaterimage = false;
  23. $formatmsg = "暂不支持该文件格式,请用图片处理软件将图片转换为gif、jpg、png格式。";
  24. //读取水印文件
  25. if(!empty($waterimage) && file_exists($waterimage))
  26. {
  27. $iswaterimage = true;
  28. $water_info = getimagesize($waterimage);
  29. $water_w = $water_info[0];//取得水印图片的宽
  30. $water_h = $water_info[1];//取得水印图片的高
  31. switch($water_info[2])//取得水印图片的格式
  32. {
  33. case 1:$water_im = imagecreatefromgif($waterimage);break;
  34. case 2:$water_im = imagecreatefromjpeg($waterimage);break;
  35. case 3:$water_im = imagecreatefrompng($waterimage);break;
  36. default:die($formatmsg);
  37. }
  38. }
  39. //读取背景图片
  40. if(!empty($groundimage) && file_exists($groundimage))
  41. {
  42. $ground_info = getimagesize($groundimage);
  43. $ground_w = $ground_info[0];//取得背景图片的宽
  44. $ground_h = $ground_info[1];//取得背景图片的高
  45. switch($ground_info[2])//取得背景图片的格式
  46. {
  47. case 1:$ground_im = imagecreatefromgif($groundimage);break;
  48. case 2:$ground_im = imagecreatefromjpeg($groundimage);break;
  49. case 3:$ground_im = imagecreatefrompng($groundimage);break;
  50. default:die($formatmsg);
  51. }
  52. }
  53. else
  54. {
  55. die("需要加水印的图片不存在!");
  56. }
  57. //水印位置
  58. if($iswaterimage)//图片水印
  59. {
  60. $w = $water_w;
  61. $h = $water_h;
  62. $label = "图片的";
  63. }
  64. else//文字水印
  65. {
  66. $temp = imagettfbbox(ceil($textfont*2.5),0,"./cour.ttf",$watertext);//取得使用 truetype 字体的文本的范围
  67. $w = $temp[2] - $temp[6];
  68. $h = $temp[3] - $temp[7];
  69. unset($temp);
  70. $label = "文字区域";
  71. }
  72. if( ($ground_w{
  73. echo "需要加水印的图片的长度或宽度比水印".$label."还小,无法生成水印!";
  74. return;
  75. }
  76. switch($waterpos)
  77. {
  78. case 0://随机
  79. $posx = rand(0,($ground_w - $w));
  80. $posy = rand(0,($ground_h - $h));
  81. break;
  82. case 1://1为顶端居左
  83. $posx = 0;
  84. $posy = 0;
  85. break;
  86. case 2://2为顶端居中
  87. $posx = ($ground_w - $w) / 2;
  88. $posy = 0;
  89. break;
  90. case 3://3为顶端居右
  91. $posx = $ground_w - $w;
  92. $posy = 0;
  93. break;
  94. case 4://4为中部居左
  95. $posx = 0;
  96. $posy = ($ground_h - $h) / 2;
  97. break;
  98. case 5://5为中部居中
  99. $posx = ($ground_w - $w) / 2;
  100. $posy = ($ground_h - $h) / 2;
  101. break;
  102. case 6://6为中部居右
  103. $posx = $ground_w - $w;
  104. $posy = ($ground_h - $h) / 2;
  105. break;
  106. case 7://7为底端居左
  107. $posx = 0;
  108. $posy = $ground_h - $h;
  109. break;
  110. case 8://8为底端居中
  111. $posx = ($ground_w - $w) / 2;
  112. $posy = $ground_h - $h;
  113. break;
  114. case 9://9为底端居右
  115. $posx = $ground_w - $w;
  116. $posy = $ground_h - $h;
  117. break;
  118. default://随机
  119. $posx = rand(0,($ground_w - $w));
  120. $posy = rand(0,($ground_h - $h));
  121. break;
  122. }
  123. //设定图像的混色模式
  124. imagealphablending($ground_im, true);
  125. if($iswaterimage)//图片水印
  126. {
  127. imagecopy($ground_im, $water_im, $posx, $posy, 0, 0, $water_w,$water_h);//拷贝水印到目标文件
  128. }
  129. else//文字水印
  130. {
  131. if( !empty($textcolor) && (strlen($textcolor)==7) )
  132. {
  133. $r = hexdec(substr($textcolor,1,2));
  134. $g = hexdec(substr($textcolor,3,2));
  135. $b = hexdec(substr($textcolor,5));
  136. }
  137. else
  138. {
  139. die("水印文字颜色格式不正确!");
  140. }
  141. imagestring ( $ground_im, $textfont, $posx, $posy, $watertext, imagecolorallocate($ground_im, $r, $g, $b));
  142. }
  143. //生成水印后的图片
  144. @unlink($groundimage);
  145. switch($ground_info[2])//取得背景图片的格式
  146. {
  147. case 1:imagegif($ground_im,$groundimage);break;
  148. case 2:imagejpeg($ground_im,$groundimage);break;
  149. case 3:imagepng($ground_im,$groundimage);break;
  150. default:die($errormsg);
  151. }
  152. //释放内存
  153. if(isset($water_info)) unset($water_info);
  154. if(isset($water_im)) imagedestroy($water_im);
  155. unset($ground_info);
  156. imagedestroy($ground_im);
  157. }
  158. //--------
  159. if(isset($_files) && !empty($_files['userfile']) && $_files['userfile']['size']>0)
  160. {
  161. $uploadfile = "./".time()."_".$_files['userfile']['name'];
  162. if (copy($_files['userfile']['tmp_name'], $uploadfile))
  163. {
  164. echo "ok
    ";
  165. //文字水印
  166. imagewatermark($uploadfile,0,"","http://blog.csdn.net/longware/",5,"#ff0000");
  167. //图片水印
  168. //$waterimage="./hanweb_shuiyin.gif";//水印图片路径
  169. //imagewatermark($uploadfile,0,$waterimage);
  170. echo "php图片自动添加水印代码,php图片水印函数代码";
  171. }
  172. else
  173. {
  174. echo "fail
    ";
  175. }
  176. }
  177. ?>
  178. 文件:
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