PHP 生成英文单词验证码程序代码_PHP教程

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。

http://www.bkjia.com/PHPjc/629617.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/629617.htmlTechArticle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...