php图片添加水印示例

例子，php为图片添加水印的代码。

2. /*
3. //示例
4. $image = new Gimage();
5. $image->limit = 600;//长宽限制
6. $image->wm_text=”www.linuxlaptop.cn”;//水印文字
7. $image->wm_fontfile=”font/xsuni.ttf”;//字体文件
8. $image->wm_color=”#ff0000″;
9. $image->save_file = “ltcn.jpg”;//保存到xx文件
10. $image->create(“linuxlaptop.jpg”);//从xx文件创建
11. */
12. /*
13. +------------------------------
14. | 生成缩略图&加水印的图片类
15. +------------------------------
16. */
17. Class Gimage{
19. var $input_type = ""; //输入图片的格式
20. var $output_type = "jpg"; //输出图片的格式
21. var $limit = 0; //图片大小限制
22. var $filename = ""; //输入图片的文件名(也可以直接是图片数据)
23. var $jpeg_quality = 90; //jpeg图片质量
24. var $save_file = ''; //输出文件名
25. var $wm_text = ""; //水印文字( 不支持中文:'( )
26. var $wm_size = 12; //水印文字大小
27. var $wm_angle = 0; //水印文字角度
28. var $wm_x = 30; //水印x坐标
29. var $wm_y = 30; //水印y坐标
30. var $wm_color = "#cccccc"; //水印颜色
31. var $wm_fontfile = "geodesic.ttf";//水印字体文件
33. function create($filename="")
34. {
35. if ($filename) $this->filename = $filename;
37. if (!$this->input_type) $this->get_type();
38. if (!$this->output_type) $this->output_type = $this->input_type;
40. if ($this->input_type == "jpg") $this->input_type = "jpeg";
41. if ($this->output_type == "jpg") $this->output_type = "jpeg";
43. switch ($this->input_type){
44. case 'gif':
45. $src_img=ImageCreateFromGIF($this->filename);
46. break;
48. case 'jpeg':
49. $src_img=ImageCreateFromJPEG($this->filename);
50. break;
52. case 'png':
53. $src_img=ImageCreateFromPNG($this->filename);
54. break;
56. default:
57. $src_img=ImageCreateFromString($this->filename);
58. break;
59. }
60. $src_w=ImageSX($src_img);
61. $src_h=ImageSY($src_img);
62. if ($src_w>=$src_h){
63. if ($src_w>$this->limit){
64. $new_w=$this->limit;
65. $new_h=($this->limit / $src_w)*$src_h;
66. }
67. }
68. else{
69. if ($src_h>$this->limit){
70. $new_h=$this->limit;
71. $new_w=($this->limit / $src_h)*$src_w;
72. }
73. }
75. if ($new_h){
76. $dst_img=imagecreatetruecolor($new_w,$new_h);
77. imagecopyresampled($dst_img,$src_img,0,0,0,0,$new_w,$new_h,ImageSX($src_img),ImageSY($src_img));
78. }
79. else{
80. $dst_img = $src_img;
81. }
83. if ($this->wm_text)
84. {
85. if(preg_match("/([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])/i", $this->wm_color, $color))
86. {
87. $red = hexdec($color[1]);
88. $green = hexdec($color[2]);
89. $blue = hexdec($color[3]);
90. }
91. $wm_color = imagecolorallocatealpha($dst_img, $red, $green, $blue, 90);
92. imagettftext($dst_img, $this->wm_size, $this->wm_angle, $this->wm_x, $this->wm_y, $wm_color, $this->wm_fontfile, $this->wm_text);
93. }
95. if ($this->save_file)
96. {
97. switch ($this->output_type){
98. case 'gif':
99. $src_img=ImagePNG($dst_img, $this->save_file);
100. break;
102. case 'jpeg':
103. $src_img=ImageJPEG($dst_img, $this->save_file, $this->jpeg_quality);
104. break;
106. case 'png':
107. $src_img=ImagePNG($dst_img, $this->save_file);
108. break;
110. default:
111. $src_img=ImageJPEG($dst_img, $this->save_file, $this->jpeg_quality);
112. break;
113. }
114. }
115. else
116. {
117. header("Content-type: image/{$this->output_type}");
118. switch ($this->output_type){
119. case 'gif':
120. $src_img=ImagePNG($dst_img);
121. break;
123. case 'jpeg':
124. $src_img=ImageJPEG($dst_img, "", $this->jpeg_quality);
125. break;
127. case 'png':
128. $src_img=ImagePNG($dst_img);
129. break;
131. default:
132. $src_img=ImageJPEG($dst_img, "", $this->jpeg_quality);
133. break;
134. }
135. }
136. imagedestroy($dst_img);
138. }
139. function get_type()//获取图像文件类型
140. {
141. $name_array = explode(".",$this->filename);
142. if (preg_match("/\.(jpg|jpeg|gif|png)$/", $this->filename, $matches))
143. {
144. $this->input_type = strtolower($matches[1]);
145. }
146. else
147. {
148. $this->input_type = "string";
149. }
150. }
151. }

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