这是一款老外的经典的php生成缩略图类函数,文件灵活实用,可以生成任何风格的图片,并且可以把文本转换成图形.

php生成缩略图,文本转换成图形实例代码如下:

1. copyright : smart-info limited. all right reserved.
2. author : jacky cheung
3. version : 1.1
4. create date : 24 september 2008
5. last modify : 15 march 2009
6. */
7. class gd
8. {
9. var $font_face = "";
10. var $text = "";
11. var $size = 12;
12. var $color = "#000000";
13. var $angle = 0;
14. var $width = 0;
15. var $height = 0;
16. var $line_height = 0;
17. var $type = "png";
18. var $chmod = 0777;
19. var $bg_color = "#ffffff";
20. var $quality = 95;
21. var $antialias = true;
22. var $x = 0;
23. var $y = 0;
24. /*___| convert text to image |___*/
25. public function text2image ( $font_, $text="", $attributes=false, $width=0, $all=false )
26. {
27. $this->font_face = $font_face;
28. $this->text = $text;
29. $this->width = $width;
30. $this->size = 12;
31. $this->color = "#000000";
32. $this->angle = 0;
33. $this->line_height = 0;
34. $this->setprop ( $attributes );
35. if ( $this->width == 0 )
36. {
37. return $this->convert_text2image ( $this->text, $this->check_text_width( $this->text ) );
38. } else {
39. // word wrap
40. if ( $all === false )
41. {
42. $text = split(" ", $this->text);
43. $text = $this->word_wrap($this->text, $this->width, "<br>");
44. $text = split("<br>", $text );
45. } else if ( $all === true ) {
46. $temp = array();
47. for ( $i=0; $i<strlen($this->text); $i++ )
48. {
49. array_push ( $temp, mb_substr($this->text, $i, 1, "utf-8") );
50. }
51. $text = array();
52. $count_width = 0;
53. $i = 0;
54. foreach ( $temp as $k => $t )
55. {
56. $prop = $this->check_text_width($t);
57. if ( $count_width + floatval($prop["width"]) < $this->width )
58. {
59. $text[$i] = $text[$i] . $t;
60. $count_width += floatval($prop["width"]);
61. } else {
62. $count_width = 0;
63. $i++;
64. $text[$i] = "";
65. }
66. }
67. }
68. $img = array();
69. foreach ( $text as $k => $t )
70. {
71. $img[$k] = $this->convert_text2image ( $t, $this->check_text_width( $t ) );
72. }
73. $w = 0;
74. $h = 0;
75. foreach ( $img as $k => $v )
76. {
77. $w = (imagesx($img[$k]) > $w) ? imagesx($img[$k]) : $w;
78. if ($this->line_height == 0 ) $h += imagesy($img[$k]);
79. else $h += ($k < count($img)-1) ? $this->line_height : imagesy($img[$k]);
80. }
81. $base_img = $this->createtransparent($w, $h);
82. $locy = 0;
83. foreach ( $img as $k => $v )
84. {
85. if ($k > 0)
86. {
87. $locy = ($this->line_height == 0) ? $locy + imagesy($img[$k]) : $locy + $this->line_height;
88. }
89. $base_img = $this->attachgdimage ( $img[$k], $base_img, array ("x"=>0, "y"=>$locy) );
90. }
91. return $base_img;
92. }
93. }
94. private function word_wrap( $str, $width, $break )
95. {
96. $formatted = '';
97. $position = -1;
98. $prev_position = 0;
99. $last_line = -1;
100. /// looping the string stop at each space
101. while( $position = mb_stripos( $str, " ", ++$position, 'utf-8' ) ) {
102. if( $position > $last_line + $width + 1 ) {
103. $formatted.= mb_substr( $str, $last_line + 1, $prev_position - $last_line - 1, 'utf-8' ).$break;
104. $last_line = $prev_position;
105. }
106. $prev_position = $position;
107. }
108. /// adding last line without the break
109. $formatted.= mb_substr( $str, $last_line + 1, mb_strlen( $str ), 'utf-8' );
110. return $formatted;
111. }
112. public function convert_text2image ( $text, $prop )
113. {
114. $im = imagecreatetruecolor ( $prop["width"], $prop["height"] );
115. $rgb = $this->getrgb ( $this->color );
116. $color = imagecolorallocate ( $im, $rgb["red"], $rgb["green"], $rgb["blue"] );
117. $img = $this->createtransparent ( $prop["width"], $prop["height"] );
118. imagettftext ( $img, $this->size, $this->angle, 0, $prop["height"] - abs ( $prop["top"] ), $color, $this->font_face, $text );
119. return $img;
120. }
121. public function check_text_width ( $text )
122. {
123. $prop = array();
124. $bbox = imagettfbbox ( $this->size, $this->angle, $this->font_face, $text );
125. $prop["left"] = $bbox[0];
126. $prop["right"] = $bbox[2];
127. $prop["top"] = $bbox[1];
128. $prop["bottom"] = $bbox[7];
129. $padding = 2;
130. $prop["width"] = abs($prop["left"]) + abs($prop["right"]) + $padding;
131. $prop["height"] = abs($prop["top"]) + abs($prop["bottom"]) + $padding;
132. return $prop;
133. }
134. /*___| save to image file |___*/
135. public function save($gdimage, $filename, $attributes=false)
136. {
137. $this->type = "png";
138. $this->chmod = 0777;
139. $this->bg_color = "#ffffff";
140. $this->quality = 95;
141. $this->antialias = true;
142. $this->setprop ( $attributes );
143. // process
144. switch ( strtolower ( $this->type ) )
145. {
146. case "jpeg":
147. case "jpg":
148. $gdimage = $this->createbackground($gdimage, imagesx($gdimage), imagesy($gdimage));
149. imagejpeg ( $gdimage, $filename, $this->quality );
150. break;
151. case "gif":
152. $gdimage = $this->createbackground($gdimage, imagesx($gdimage), imagesy($gdimage));
153. imagegif ( $gdimage, $filename );
154. break;
155. case "png":
156. default :
157. imagepng ( $gdimage, $filename );
158. break;
159. }
160. chmod ( $filename, $this->chmod );
161. }
162. /*___| create gd background image |___*/
163. public function createbackground($gdimage, $width, $height)
164. {
165. $img = imagecreatetruecolor ( $width, $height );
166. $rgb = $this->getrgb ( $this->bg_color );
167. $color = imagecolorallocate ( $img, $rgb["red"], $rgb["green"], $rgb["blue"] );
168. imagefill ( $img, 0, 0, $color );
169. imagecopyresampled ( $img, $gdimage, 0, 0, 0, 0, $width, $height, $width, $height );
170. return $img;
171. }
172. /*___| create gd transparent image |___*/
173. public function createtransparent($width, $height)
174. {
175. $img = imagecreatetruecolor($width, $height);
176. imagealphablending($img, false);
177. imagesavealpha($img, true);
178. $transparent = imagecolorallocatealpha($img, 0, 0, 0, 127);
179. imagefilledrectangle($img, 0, 0, $width, $height, $transparent);
180. imagecopyresampled($img, $img, 0, 0, 0, 0, $width, $height, $width, $height);
181. return $img;
182. }
183. /*___| load image |___*/
184. public function createimagefrom($filename, $alpha=true)
185. {
186. if ( function_exists ( "exif_imagetype" ) )
187. {
188. if ( exif_imagetype ( $filename ) == imagetype_jpeg ) { return $this->createfromjpeg ( $filename ); }
189. else if ( exif_imagetype ( $filename ) == imagetype_gif ) { return $this->createfromgif ( $filename ); }
190. else if ( exif_imagetype ( $filename ) == imagetype_png ) { return $this->createfrompng ( $filename, $alpha ); }
191. }
192. else
193. {
194. if ( strstr ( strtoupper ( $filename ) , ".jpg" ) || strstr ( strtoupper ( $filename ), ".jpeg" )) { return $this->createfromjpeg ( $filename ); }
195. else if ( strstr ( strtoupper ( $filename ) , ".gif" )) { return $this->createfromgif ( $filename ); }
196. else if ( strstr ( strtoupper ( $filename ) , ".png" )) { return $this->createfrompng ( $filename, $alpha ); }
197. }
198. return false;
199. }
200. private function createfromjpeg ( $filename ) { return imagecreatefromjpeg ( $filename ); }
201. private function createfromgif ( $filename ) { return imagecreatefromgif ( $filename ); }
202. private function createfrompng ( $filename, $alpha=true )
203. {
204. if ( $alpha )
205. {
206. list ( $width, $height ) = getimagesize ( $filename );
207. $png_img = imagecreatefrompng ( $filename );
208. $img = imagecreatetruecolor ( $width, $height );
209. imagealphablending ( $img, false );
210. imagesavealpha ( $img, true );
211. imagecopyresampled ( $img, $png_img, 0, 0, 0, 0, $width, $height, $width, $height );
212. } else {
213. $img = imagecreatefrompng ( $filename );
214. }
215. return $img;
216. }
217. /*___| attach background image |___*/
218. public function attachbackgroundimage ( $gdimage, $filename, $attributes=false )
219. {
220. $this->x = 0;
221. $this->y = 0;
222. $this->setprop ( $attributes );
223. $img = $this->createimagefrom ( $filename );
224. imagecopyresampled ( $img, $gdimage, $this->x, $this->y, 0, 0, imagesx($gdimage), imagesy($gdimage), imagesx($gdimage), imagesy($gdimage) );
225. return $img;
226. }
227. /*___| attach image |___*/
228. public function attachimage ( $source, $target, $filename, $image_attributes=false, $attributes=false )
229. {
230. $source_img = $this->createimagefrom ( $source );
231. $target_img = $this->attachbackgroundimage ( $source_img, $target, $attributes );
232. $this->save ( $target_img, $filename, $image_attributes );
233. }
234. /*___| attach gd image resource |___*/
235. public function attachgdimage ( $gd_source, $gd_target, $attributes=false )
236. {
237. $this->x = 0;
238. $this->y = 0;
239. $this->width = 0;
240. $this->height = 0;
241. $this->setprop ( $attributes );
242. imagealphablending($gd_target, true );
243. imagealphablending($gd_source, true );
244. imagecopy ( $gd_target, $gd_source, $this->x, $this->y, 0, 0, imagesx($gd_source), imagesy($gd_source) );
245. return $gd_target;
246. }
247. /*___| get rgb color |___*/
248. public function getrgb($hex)
249. {
250. $rgb["red"] = hexdec ( substr ( $hex, 1, 2 ) ) ;
251. $rgb["green"] = hexdec ( substr ( $hex, 3, 2 ) ) ;
252. $rgb["blue"] = hexdec ( substr ( $hex, 5, 2 ) ) ;
253. return $rgb;
254. }
255. /*___| set properties |___*/
256. private function setprop ( $attributes=false )
257. {
258. if ( $attributes ) { foreach ( $attributes as $key => $value ) { $k = strtoupper ( $key ); $this->$k = $value; } }
259. }
260. }
261. //开源代码phpfensi.com
262. //调用 方法代码如下:
263. $imgresize = new imagetransform();
264. $imgresize->sourcefile = $source.$file;
265. $imgresize->targetfile = $destination.$file;
266. $imgresize->chmodvalue = 0777;
267. $imgresize->resizetowidth = $tw;
268. $imgresize->resizetoheight = $th;
269. $imgresize->jpegoutputquality = 100;
270. $imgresize->resizeifsmaller = false;
271. $imgresize->resize();