93 lines
2.2 KiB
PHP
93 lines
2.2 KiB
PHP
<?php
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defined('is_running') or die('Not an entry point...');
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class AntiSpamMath{
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var array $operators = array(1=>'plus',2=>'minus',3=>'divided by',4=>'times');
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/**
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* @throws Exception
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*/
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function Form($html){
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$operator_key = array_rand($this->operators);
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$operator = $this->operators[$operator_key];
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$asm_1 = random_int(1,10);
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$asm_3 = random_int(1,10);
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if ($operator_key == 3) {
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$asm_1 = $asm_1 * $asm_3;
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}
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$inputs = array();
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$inputs[] = ' <input type="hidden" name="asm_1" value="'.$asm_1.'" /> ';
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$inputs[] = ' <input type="hidden" name="asm_2" value="'.$operator_key.'" /> ';
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$inputs[] = ' <input type="hidden" name="asm_3" value="'.$asm_3.'" /> ';
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shuffle($inputs);
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if ( !ob_start('ob_gzhandler') ) {
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ob_start();
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}
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echo implode('',$inputs);
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echo '<span class="anti_spam_math">';
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echo $asm_1;
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echo ' ';
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echo gpOutput::GetAddonText($operator);
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echo ' ';
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echo $asm_3;
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echo ' ';
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echo gpOutput::GetAddonText('equals');
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echo '<input type="text" name="asm_4" value="" size="4" maxlength="6" /> ';
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echo '</span>';
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$html .= ob_get_clean();
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return $html;
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}
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function message_alert($msg) {
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echo "<script type='text/javascript'>alert('$msg');</script>";
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}
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function Check($passed){
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$message = gpOutput::SelectText('Sorry, your answer to the verification challenge was incorrect. Please try again.');
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if( empty($_POST['asm_1']) || empty($_POST['asm_2']) || empty($_POST['asm_3']) ){
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$this->message_alert($message . ' (1)');
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return false;
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}
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$operator_key = $_POST['asm_2'];
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if( !isset($this->operators[$operator_key]) ){
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$this->message_alert($message . ' (2)');
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return false;
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}
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switch($operator_key){
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case 1:
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$result = $_POST['asm_1'] + $_POST['asm_3'];
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break;
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case 2:
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$result = $_POST['asm_1'] - $_POST['asm_3'];
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break;
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case 3:
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$result = $_POST['asm_1'] / $_POST['asm_3'];
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break;
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case 4:
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$result = $_POST['asm_1'] * $_POST['asm_3'];
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break;
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}
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$compare = $_POST['asm_4'];
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//message('result: '.$result.' vs submitted: '.$compare);
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if( $compare != $result ){
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$this->message_alert($message . ' (3)');
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return false;
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}
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//message('passed');
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return $passed;
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}
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}
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