在国外网站上看到的一个很好用的验证码封装类，跟大家分享一下。
还有部分文件没有放上去。
1 <?php
2 /**
3 * Script para la generaci CAPTCHAS
4 *
5 * @author Jose Rodriguez <jose.rodriguez@exec.cl>
6 * @license GPLv3
7 * @link http://code.google.com/p/cool-php-captcha
8 * @package captcha
9 * @version 0.3
10 *
11 */
12
13 session_start();
14
15 $captcha = new SimpleCaptcha();
16
17 // OPTIONAL Change configuration...
18 //$captcha->wordsFile = 'words/es.php';
19 //$captcha->session_var = 'secretword';
20 //$captcha->imageFormat = 'png';
21 //$captcha->lineWidth = 3;
22 //$captcha->scale = 3; $captcha->blur = true;
23 //$captcha->resourcesPath = "/var/cool-php-captcha/resources";
24
25 // OPTIONAL Simple autodetect language example
26 /*
27 if (!empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
28 $langs = array('en', 'es');
29 $lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
30 if (in_array($lang, $langs)) {
31 $captcha->wordsFile = "words/$lang.php";
32 }
33 }
34 */
35
36 // Image generation
37 $captcha->CreateImage();
38
39
40 /**
41 * SimpleCaptcha class
42 *
43 */
44 class SimpleCaptcha {
45
46 /** Width of the image */
47 public $width = 200;
48
49 /** Height of the image */
50 public $height = 70;
51
52 /** Dictionary word file (empty for random text) */
53 public $wordsFile = 'words/en.php';
54
55 /**
56 * Path for resource files (fonts, words, etc.)
57 *
58 * "resources" by default. For security reasons, is better move this
59 * directory to another location outise the web server
60 *
61 */
62 public $resourcesPath = 'resources';
63
64 /** Min word length (for non-dictionary random text generation) */
65 public $minWordLength = 5;
66
67 /**
68 * Max word length (for non-dictionary random text generation)
69 *
70 * Used for dictionary words indicating the word-length
71 * for font-size modification purposes
72 */
73 public $maxWordLength = 8;
74
75 /** Sessionname to store the original text */
76 public $session_var = 'captcha';
77
78 /** Background color in RGB-array */
79 public $backgroundColor = array(255, 255, 255);
80
81 /** Foreground colors in RGB-array */
82 public $colors = array(
83 array(27,78,181), // blue
84 array(22,163,35), // green
85 array(214,36,7), // red
86 );
87
88 /** Shadow color in RGB-array or null */
89 public $shadowColor = null; //array(0, 0, 0);
90
91 /** Horizontal line through the text */
92 public $lineWidth = 0;
93
94 /**
95 * Font configuration
96 *
97 * - font: TTF file
98 * - spacing: relative pixel space between character
99 * - minSize: min font size
100 * - maxSize: max font size
101 */
102 public $fonts = array(
103 'Antykwa' => array('spacing' => -3, 'minSize' => 27, 'maxSize' => 30, 'font' => 'AntykwaBold.ttf'),
104 'Candice' => array('spacing' =>-1.5,'minSize' => 28, 'maxSize' => 31, 'font' => 'Candice.ttf'),
105 'DingDong' => array('spacing' => -2, 'minSize' => 24, 'maxSize' => 30, 'font' => 'Ding-DongDaddyO.ttf'),
106 'Duality' => array('spacing' => -2, 'minSize' => 30, 'maxSize' => 38, 'font' => 'Duality.ttf'),
107 'Heineken' => array('spacing' => -2, 'minSize' => 24, 'maxSize' => 34, 'font' => 'Heineken.ttf'),
108 'Jura' => array('spacing' => -2, 'minSize' => 28, 'maxSize' => 32, 'font' => 'Jura.ttf'),
109 'StayPuft' => array('spacing' =>-1.5,'minSize' => 28, 'maxSize' => 32, 'font' => 'StayPuft.ttf'),
110 'Times' => array('spacing' => -2, 'minSize' => 28, 'maxSize' => 34, 'font' => 'TimesNewRomanBold.ttf'),
111 'VeraSans' => array('spacing' => -1, 'minSize' => 20, 'maxSize' => 28, 'font' => 'VeraSansBold.ttf'),
112 );
113
114 /** Wave configuracion in X and Y axes */
115 public $Yperiod = 12;
116 public $Yamplitude = 14;
117 public $Xperiod = 11;
118 public $Xamplitude = 5;
119
120 /** letter rotation clockwise */
121 public $maxRotation = 8;
122
123 /**
124 * Internal image size factor (for better image quality)
125 * 1: low, 2: medium, 3: high
126 */
127 public $scale = 2;
128
129 /**
130 * Blur effect for better image quality (but slower image processing).
131 * Better image results with scale=3
132 */
133 public $blur = false;
134
135 /** Debug? */
136 public $debug = false;
137
138 /** Image format: jpeg or png */
139 public $imageFormat = 'jpeg';
140
141
142 /** GD image */
143 public $im;
144
145 public function __construct($config = array()) {
146 }
147
148 public function CreateImage() {
149 $ini = microtime(true);
150
151 /** Initialization */
152 $this->ImageAllocate();
153
154 /** Text insertion */
155 $text = $this->GetCaptchaText();
156 $fontcfg = $this->fonts[array_rand($this->fonts)];
157 $this->WriteText($text, $fontcfg);
158
159 $_SESSION[$this->session_var] = $text;
160
161 /** Transformations */
162 if (!empty($this->lineWidth)) {
163 $this->WriteLine();
164 }
165 $this->WaveImage();
166 if ($this->blur && function_exists('imagefilter')) {
167 imagefilter($this->im, IMG_FILTER_GAUSSIAN_BLUR);
168 }
169 $this->ReduceImage();
170
171
172 if ($this->debug) {
173 imagestring($this->im, 1, 1, $this->height-8,
174 "$text {$fontcfg['font']} ".round((microtime(true)-$ini)*1000)."ms",
175 $this->GdFgColor
176 );
177 }
178
179
180 /** Output */
181 $this->WriteImage();
182 $this->Cleanup();
183 }
184
185
186 /**
187 * Creates the image resources
188 */
189 protected function ImageAllocate() {
190 // Cleanup
191 if (!empty($this->im)) {
192 imagedestroy($this->im);
193 }
194
195 $this->im = imagecreatetruecolor($this->width*$this->scale, $this->height*$this->scale);
196
197 // Background color
198 $this->GdBgColor = imagecolorallocate($this->im,
199 $this->backgroundColor[0],
200 $this->backgroundColor[1],
201 $this->backgroundColor[2]
202 );
203 imagefilledrectangle($this->im, 0, 0, $this->width*$this->scale, $this->height*$this->scale, $this->GdBgColor);
204
205 // Foreground color
206 $color = $this->colors[mt_rand(0, sizeof($this->colors)-1)];
207 $this->GdFgColor = imagecolorallocate($this->im, $color[0], $color[1], $color[2]);
208
209 // Shadow color
210 if (!empty($this->shadowColor) && is_array($this->shadowColor) && sizeof($this->shadowColor) >= 3) {
211 $this->GdShadowColor = imagecolorallocate($this->im,
212 $this->shadowColor[0],
213 $this->shadowColor[1],
214 $this->shadowColor[2]
215 );
216 }
217 }
218
219
220 /**
221 * Text generation
222 *
223 * @return string Text
224 */
225 protected function GetCaptchaText() {
226 $text = $this->GetDictionaryCaptchaText();
227 if (!$text) {
228 $text = $this->GetRandomCaptchaText();
229 }
230 return $text;
231 }
232
233
234 /**
235 * Random text generation
236 *
237 * @return string Text
238 */
239 protected function GetRandomCaptchaText($length = null) {
240 if (empty($length)) {
241 $length = rand($this->minWordLength, $this->maxWordLength);
242 }
243
244 $words = "abcdefghijlmnopqrstvwyz";
245 $vocals = "aeiou";
246
247 $text = "";
248 $vocal = rand(0, 1);
249 for ($i=0; $i<$length; $i++) {
250 if ($vocal) {
251 $text .= substr($vocals, mt_rand(0, 4), 1);
252 } else {
253 $text .= substr($words, mt_rand(0, 22), 1);
254 }
255 $vocal = !$vocal;
256 }
257 return $text;
258 }
259
260
261 /**
262 * Random dictionary word generation
263 *
264 * @param boolean $extended Add extended "fake" words
265 * @return string Word
266 */
267 function GetDictionaryCaptchaText($extended = false) {
268 if (empty($this->wordsFile)) {
269 return false;
270 }
271
272 // Full path of words file
273 if (substr($this->wordsFile, 0, 1) == '/') {
274 $wordsfile = $this->wordsFile;
275 } else {
276 $wordsfile = $this->resourcesPath.'/'.$this->wordsFile;
277 }
278
279 if (!file_exists($wordsfile)) {
280 return false;
281 }
282
283 $fp = fopen($wordsfile, "r");
284 $length = strlen(fgets($fp));
285 if (!$length) {
286 return false;
287 }
288 $line = rand(1, (filesize($wordsfile)/$length)-2);
289 if (fseek($fp, $length*$line) == -1) {
290 return false;
291 }
292 $text = trim(fgets($fp));
293 fclose($fp);
294
295
296 /** Change ramdom volcals */
297 if ($extended) {
298 $text = preg_split('//', $text, -1, PREG_SPLIT_NO_EMPTY);
299 $vocals = array('a', 'e', 'i', 'o', 'u');
300 foreach ($text as $i => $char) {
301 if (mt_rand(0, 1) && in_array($char, $vocals)) {
302 $text[$i] = $vocals[mt_rand(0, 4)];
303 }
304 }
305 $text = implode('', $text);
306 }
307
308 return $text;
309 }
310
311
312 /**
313 * Horizontal line insertion
314 */
315 protected function WriteLine() {
316
317 $x1 = $this->width*$this->scale*.15;
318 $x2 = $this->textFinalX;
319 $y1 = rand($this->height*$this->scale*.40, $this->height*$this->scale*.65);
320 $y2 = rand($this->height*$this->scale*.40, $this->height*$this->scale*.65);
321 $width = $this->lineWidth/2*$this->scale;
322
323 for ($i = $width*-1; $i <= $width; $i++) {
324 imageline($this->im, $x1, $y1+$i, $x2, $y2+$i, $this->GdFgColor);
325 }
326 }
327
328 /**
329 * Text insertion
330 */
331 protected function WriteText($text, $fontcfg = array()) {
332 if (empty($fontcfg)) {
333 // Select the font configuration
334 $fontcfg = $this->fonts[array_rand($this->fonts)];
335 }
336
337 // Full path of font file
338 $fontfile = $this->resourcesPath.'/fonts/'.$fontcfg['font'];
339
340
341 /** Increase font-size for shortest words: 9% for each glyp missing */
342 $lettersMissing = $this->maxWordLength-strlen($text);
343 $fontSizefactor = 1+($lettersMissing*0.09);
344
345 // Text generation (char by char)
346 $x = 20*$this->scale;
347 $y = round(($this->height*27/40)*$this->scale);
348 $length = strlen($text);
349 for ($i=0; $i<$length; $i++) {
350 $degree = rand($this->maxRotation*-1, $this->maxRotation);
351 $fontsize = rand($fontcfg['minSize'], $fontcfg['maxSize'])*$this->scale*$fontSizefactor;
352 $letter = substr($text, $i, 1);
353
354 if ($this->shadowColor) {
355 $coords = imagettftext($this->im, $fontsize, $degree,
356 $x+$this->scale, $y+$this->scale,
357 $this->GdShadowColor, $fontfile, $letter);
358 }
359 $coords = imagettftext($this->im, $fontsize, $degree,
360 $x, $y,
361 $this->GdFgColor, $fontfile, $letter);
362 $x += ($coords[2]-$x) + ($fontcfg['spacing']*$this->scale);
363 }
364
365 $this->textFinalX = $x;
366 }
367
368 /**
369 * Wave filter
370 */
371 protected function WaveImage() {
372 // X-axis wave generation
373 $xp = $this->scale*$this->Xperiod*rand(1,3);
374 $k = rand(0, 100);
375 for ($i = 0; $i < ($this->width*$this->scale); $i++) {
376 imagecopy($this->im, $this->im,
377 $i-1, sin($k+$i/$xp) * ($this->scale*$this->Xamplitude),
378 $i, 0, 1, $this->height*$this->scale);
379 }
380
381 // Y-axis wave generation
382 $k = rand(0, 100);
383 $yp = $this->scale*$this->Yperiod*rand(1,2);
384 for ($i = 0; $i < ($this->height*$this->scale); $i++) {
385 imagecopy($this->im, $this->im,
386 sin($k+$i/$yp) * ($this->scale*$this->Yamplitude), $i-1,
387 0, $i, $this->width*$this->scale, 1);
388 }
389 }
390
391 /**
392 * Reduce the image to the final size
393 */
394 protected function ReduceImage() {
395
396 $imResampled = imagecreatetruecolor($this->width, $this->height);
397 imagecopyresampled($imResampled, $this->im,
398 0, 0, 0, 0,
399 $this->width, $this->height,
400 $this->width*$this->scale, $this->height*$this->scale
401 );
402 imagedestroy($this->im);
403 $this->im = $imResampled;
404 }
405
406
407 /**
408 * File generation
409 */
410 protected function WriteImage() {
411 if ($this->imageFormat == 'png' && function_exists('imagepng')) {
412 header("Content-type: image/png");
413 imagepng($this->im);
414 } else {
415 header("Content-type: image/jpeg");
416 imagejpeg($this->im, null, 80);
417 }
418 }
419
420 /**
421 * Cleanup
422 */
423 protected function Cleanup() {
424 imagedestroy($this->im);
425 }
426 }
427
428 ?>