Рекурсивный акроним словосочетания «PHP: Hypertext Preprocessor»
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Example
Вернуться к: Text_CAPTCHA_Numeral
The following example implements the standard use of a CAPTCHA: Submitted form data is only evaluated when a CAPTCHA has been solved correctly.
Creating a Numeral CAPTCHA
This example is just to show you how to generate a simple mathematic operation with Text_CAPTCHA_Numeral.
<?php
require_once 'Text/CAPTCHA/Numeral.php';
$num = new Text_CAPTCHA_Numeral;
$operation = $num->getOperation();
/**
* This will print the mathematical operation
* that has been generated by the package.
*/
print $operation;
?> Securing a form with a Numeral CAPTCHA
This example will show you how to secure a form using the numeral captcha. It generates an operation and stores its result into a session variable.
<?php
require_once 'Text/CAPTCHA/Numeral.php';
$numcap = new Text_CAPTCHA_Numeral;
if (isset($_POST['captcha']) && isset($_SESSION['answer'])) {
if ($_POST['captcha'] == $_SESSION['answer']) {
$errors[] = 'Ok... You might be human...';
} else {
$errors[] = 'You are dumb or not human';
}
}
if (!empty($errors)) {
foreach ($errors as $error) {
print "<h1><font color='red'>$error</font></h1><br />";
}
}
print '
<form name="capter" action="index.php?page=liveExample" method="post">
<table>
<tr>
<th>What is this result pilgrim?: '.$numcap->getOperation().'</th>
<td><input type="text" value="" name="captcha" /></td>
</tr>
<tr>
<th/>
<td><input type="submit" value="Let me prove you that I am human!" /></td>
</tr>
</form>
';
$_SESSION['answer'] = $numcap->getAnswer();
?> Вернуться к: Text_CAPTCHA_Numeral