开源 PHP 验证码 Securimage 带语音识别 - 陈达辉

开源 PHP 验证码 Securimage 带语音识别 2cb6b96a412e17b0

官方网站：http://www.phpcaptcha.org/
下载地址：http://www.phpcaptcha.org/download/
原文地址：http://www.21andy.com/blog/20100417/1886.html

Securimage 使用方法：

验证码图片：

验证码文本框：

看不清验证码：

<a href="#" rel="nofollow" target="_blank">Reload Image</a>

原文地址：http://www.21andy.com/blog/20100417/1886.html

后端PHP验证：

<?php
session_start();

include_once $_SERVER[\'DOCUMENT_ROOT\'] . \'/securimage/securimage.php\';
$securimage = new Securimage();

if ($securimage->check($_POST[\'captcha_code\']) == false) {
// the code was incorrect
// handle the error accordingly with your other error checking

// or you can do something really basic like this
die(\'The code you entered was incorrect. Go back and try again.\');
}

Securimage 类属性：

$img->image_width = 275;
$securimage->image_height = 90;
$securimage->perturbation = 0.9; // 1.0 = high distortion, higher numbers = more distortion
$securimage->image_bg_color = new Securimage_Color("#0099CC");
$securimage->text_color = new Securimage_Color("#EAEAEA");
$securimage->text_transparency_percentage = 65; // 100 = completely transparent
$securimage->num_lines = 8;
$securimage->line_color = new Securimage_Color("#0000CC");
$securimage->signature_color = new Securimage_Color(rand(0, 64), rand(64, 128), rand(128, 255));
$securimage->image_type = SI_IMAGE_PNG;
$securimage->show(\'backgrounds/bg5.jpg\')

Securimage AJAX 完整示例

AJAX 前端HTML：

<html>
<head>
<title>PHP Captcha with Ajax</title>
<script type="text/javascript" src="prototype.js"></script>

<script type="text/javascript">

</script>
</head>

<body>

<form id="contact_form" action="process.php" method="post" onsubmit="return processForm()">
<div style="float: left; width: 100px">Your name:</div>
<div style="float: left"><input type="text" name="sender_name" size="20" /></div>
<div style="clear: both"></div>

<div style="float: left; width: 100px">Email:</div>
<div style="float: left"><input type="text" name="sender_email" size="30" /></div>
<div style="clear: both"></div>

<div style="float: left; width: 100px">Message:</div>
<div style="float: left"><textarea name="message" rows="4" cols="30"></textarea></div>
<div style="clear: both"></div>

<div style="float: left; width: 100px">Security Image:</div>
<div style="float: left"><img src="securimage/securimage_show.php" alt="CAPTCHA Image" /></div>
<div style="clear: both"></div>

<div style="float: left; width: 100px">Security Code:</div>
<div style="float: left"><input type="text" name="code" size="8" /></div>
<div style="clear: both"></div>

<div style="float: left; width: 100px"> </div>
<div style="float: left"><input id="submit" type="submit" value="Send Message" /></div>
<div style="clear: both"></div>
</form>

</body>
</html>

AJAX 后端PHP：

下载: process.php

<?php

/**
* Securimage with AJAX
*
* Author: Drew Phillips (www.phpcaptcha.org)
*
* This code is released to the public domain.
*
*/

$your_email = \'you@example.com\'; // Email to send message to

if ($_SERVER[\'REQUEST_METHOD\'] != \'POST\') exit; // Quit if it is not a form post

// quick way clean up incoming fields
foreach($_POST as $key => $value) $_POST[$key] = urldecode(trim($value));

// get form data into shorter variables
// each $_POST variable is named based on the form field\'s id value
$name = $_POST[\'sender_name\'];
$email = $_POST[\'sender_email\'];
$message = $_POST[\'message\'];
$code = $_POST[\'code\'];

$errors = array(); // array of errors

// basic validation
if ($name == \'\') {
$errors[] = "Please enter your name";
}

if ($email == \'\') {
$errors[] = "Please enter your email address";
} else if (strpos($email, \'@\') === false) {
$errors[] = "Please enter a valid email address";
}

if ($message == \'\') {
$errors[] = "Please enter a message to send";
}

if (sizeof($errors) == 0) {
// only check the code if there are no other errors
require_once \'securimage/securimage.php\';
$img = new Securimage;
if ($img->check($code) == false) {
$errors[] = "Incorrect security code entered";
} // if the code checked is correct, it is destroyed to prevent re-use
}

if (sizeof($errors) > 0) {
// if errors, send the error message
$str = implode("\n", $errors);
die("There was an error with your submission! Please correct the following:\n\n" . $str);
}

$time = date(\'r\');
$body = <<<EOD
Hi!

A message was sent to you from $name on $time.

Here is their message:

$message
EOD;

// send email
mail($your_email, "Contact Form Sent", $body, "From: $your_email\r\nReply-To: $email\r\nContent-Type: text/plain; charset=ISO-8859-1\r\nMIME-Version: 1.0");

die(\'OK\'); // send success indicator

?>

更详细的文档请看官方网站