PHP generates English word verification code program code

If you want to generate a word verification code, we must have a prepared word library. Below I have prepared a txt file for everyone. There are a lot of words in it. We just need to read it casually when generating it and it will be KO. .

Specific

The code is as follows

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$width=145;
$height = 45;

$authcode = vcaptcha_read_code('words.txt') ;

$bg = 'bg/captcha_bg3.jpg';

$img_type = 'png';

/* Verification code length */
$letters = strlen($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);

/* Copy the background image from the original image and resize it */
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);

/* Draw border */
imagerectangle($img_org, 0, 0, $width - 1, $height - 1, $clr);

/* Get the height and width of the verification code */
$x = ($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 < 32) return false; // too small of a list to be effective

If ($fsize < 128) {
$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); $end = strpos($data, "n", $start); // find end of word

Return strtolower(substr($data, $start, $end - $start)); // return substring in 128 bytes
}

Usage:

PHP script generates word verification code

Copy this code into HTML and you’re done. There is also this getCode function to prevent users from seeing the verification code clearly. Click to switch. The JavaScript script is as follows:

http://file.bKjia.c0m/upload/mbdown/pic/2013/06/26/13659538282901.txt This is a vocabulary library that everyone can download.

http://www.bkjia.com/PHPjc/629617.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/629617.htmlTechArticleIf you want to generate a word verification code, we must have a prepared word library. I will prepare it for you below. I have a txt file with a lot of words in it. We just need to generate it anytime...

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