PHP 生成英文单词验证码程序代码

如果你要生成单词验证码我们必须一个己经做好的单词库了，下面我给大家准备了一个txt文件，这里面放了大量的单词，我们只要生成时随便读到生成就KO了。

具体

代码如下

复制代码

$width=145; $height = 45;          $authcode = vcaptcha_read_code('words.txt') ;          $bg = 'bg/captcha_bg3.jpg';          $img_type   = 'png';          /* 验证码长度 */ $letters = strlen($authcode);          $img_bg    = (function_exists('imagecreatefromjpeg') && ((imagetypes() & IMG_JPG) > 0)) ?                 imagecreatefromjpeg($bg) : imagecreatefromgif($bg); $bg_width  = imagesx($img_bg); $bg_height = imagesy($img_bg);          $img_org   = ((function_exists('imagecreatetruecolor')) && PHP_VERSION >= '4.3') ?               imagecreatetruecolor($width, $height) : imagecreate($width, $height);          /* 将背景图象复制原始图象并调整大小 */ if (function_exists('imagecopyresampled') && PHP_VERSION >= '4.3') // GD 2.x {     imagecopyresampled($img_org, $img_bg, 0, 0, 0, 0, $width, $height, $bg_width, $bg_height); } else // GD 1.x {     imagecopyresized($img_org, $img_bg, 0, 0, 0, 0, $width, $height, $bg_width, $bg_height); } imagedestroy($img_bg);          $clr = imagecolorallocate($img_org, 255, 255, 255);          /* 绘制边框 */ imagerectangle($img_org, 0, 0, $width - 1, $height - 1, $clr);          /* 获得验证码的高度和宽度 */ $x = ($width - (imagefontwidth(5) * $letters)) / 2; $y = ($height - imagefontheight(5)) / 2; imagestring($img_org, 5, $x, $y, $authcode, $clr);          header('Expires: Thu, 01 Jan 1970 00:00:00 GMT');          // HTTP/1.1 header('Cache-Control: private, no-store, no-cache, must-revalidate'); header('Cache-Control: post-check=0, pre-check=0, max-age=0', false);          // HTTP/1.0 header('Pragma: no-cache'); if ($img_type == 'jpeg' && function_exists('imagecreatefromjpeg')) {     header('Content-type: image/jpeg');     imageinterlace($img_org, 1);     imagejpeg($img_org, false, 95); } else {     header('Content-type: image/png');     imagepng($img_org); }          imagedestroy($img_org);          function vcaptcha_read_code($wordlist_file) {     $fp = @fopen($wordlist_file, 'rb');     if (!$fp) return false;              $fsize = filesize($wordlist_file);     if ($fsize              if ($fsize         $max = $fsize; // still pretty small but changes the range of seeking     } else {         $max = 128;     }              fseek($fp, rand(0, $fsize - $max), SEEK_SET);     $data = fread($fp, 128); // read a random 128 bytes from file     fclose($fp);     $data = preg_replace("/r?n/", "n", $data);              $start = strpos($data, "n", rand(0, 100)) + 1; // random start position     $end   = strpos($data, "n", $start);           // find end of word              return strtolower(substr($data, $start, $end - $start)); // return substring in 128 bytes }

使用方法:

代码如下	复制代码
将这段代码复制到HTML里，就可以了。还有这个的getCode函数是为了让用户看不清验证码，点击可以切换，JavaScript脚本如下:

http://file.bKjia.c0m/upload/mbdown/pic/2013/06/26/13659538282901.txt  这是单词库大家可下载。