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‎README.md‎

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# Ultimate Member - Math Captcha in Register forms
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Displays Math Captcha field in the registration form. Math Captcha allows you to use simple math problems to test site users to prove their human identity.
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## Installation
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Follow instructions in this [guide](https://docs.ultimatemember.com/article/1663-download-installation-of-the-basic-extensions) to download and install the extension.
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## How to use
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Once the plugin is activated, it is automatically enabled. Go to your site's registration page to check and test the Math Captcha.
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### Screenshots
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Image - Math Captcha field in the registration form
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![WP, Ultimate Member, Math Captcha](https://d33v4339jhl8k0.cloudfront.net/docs/assets/561c96629033600a7a36d662/images/61e5444e8200bc052eb7f510/file-NoJi5tjkVR.png)
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## License
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GNU Version 2 or Any Later Version

‎includes/class-math-captcha.php‎

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<?php
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/**
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* PHP-based Simple Math Captcha
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*
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* @version 1.0
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* @author Nettraction <dev@nettraction.in>
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*
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*/
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Class MathCaptcha {
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private $min;
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private $max;
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private $session_var;
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private $result;
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private $operand1;
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private $operand2;
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private $operator;
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private $op_symbols = array('+', '-', '*');
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/**
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*
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* @param string $sess_var
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* @param int $min_val
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* @param int $max_val
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*/
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function __construct($sess_var = 'math_captcha_result', $min_val = 0, $max_val = 10) {
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$this->min = ($min_val <= 0) ? 0 : $min_val;
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$this->max = ($max_val <= $this->min) ? 10 : $max_val;
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if (!empty($sess_var)) {
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$this->session_var = $sess_var;
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} else {
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$this->session_var = 'math_captcha_result';
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}
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}
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/**
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* Generate a new captcha and save the result into a session variable.
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*
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*/
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public function reset_captcha() {
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if (!session_id())
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session_start();
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$this->operand1 = rand($this->min, $this->max);
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$this->operand2 = rand($this->min, $this->max);
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$this->operator = $this->op_symbols[rand(0, (count($this->op_symbols) - 1))];
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$this->compute_result();
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// Save to $_SESSION
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$_SESSION[$this->session_var] = $this->result;
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}
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private function compute_result() {
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switch ($this->operator) {
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case '+':
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$this->result = ($this->operand1 + $this->operand2);
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break;
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case '-':
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$this->result = ($this->operand1 - $this->operand2);
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break;
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case '*':
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$this->result = ($this->operand1 * $this->operand2);
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break;
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}
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}
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/**
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*
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* @param int $val Value to be compared to the result in session
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* @return boolean TRUE if the value matches; FALSE otherwise
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*/
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public function validate($val) {
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if (!session_id())
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session_start();
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if ($val == $_SESSION[$this->session_var]) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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/**
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*
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* @param string $format sprintf compatible format with text/html e.g "Compute Sum of {operand1} and {operand2}"
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* @return type
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*/
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public function get_captcha_text($format = '{operand1} {operator} {operand2}') {
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if (!empty($format)) {
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return str_replace(
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array('{operand1}', '{operand2}', '{operator}')
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, array($this->operand1, $this->operand2, $this->operator)
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, $format);
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} else {
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return sprintf("%d %s %d", $this->operand1, $this->operator, $this->operand2);
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}
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}
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/**
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* Makes it sums only!
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*/
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public function sums_only_please(){
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$this->op_symbols = array('+');
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}
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}

‎includes/class-um-math-captcha.php‎

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<?php
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/**
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* Init the extension.
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*
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* @package um_ext\um_math_captcha
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*/
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if ( ! defined( 'ABSPATH' ) ) {
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exit;
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}
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/**
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* Class UM_Math_Captcha
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*/
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class UM_Math_Captcha {
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/**
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* PHP-based Simple Math Captcha
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*
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* @var \MathCaptcha
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*/
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public $cpa;
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/**
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* Math Captcha field's name
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*
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* @var string
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*/
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public $key = 'um_math_challenge';
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/**
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* An instance of the class.
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*
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* @var UM_Math_Captcha
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*/
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private static $instance;
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/**
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* Creates an instance of the class.
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*
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* @return UM_Math_Captcha
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*/
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public static function instance() {
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if ( is_null( self::$instance ) ) {
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self::$instance = new self();
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}
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return self::$instance;
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}
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/**
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* UM_Math_Captch constructor.
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*/
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public function __construct() {
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if ( ! class_exists( 'MathCaptcha' ) ) {
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require_once 'class-math-captcha.php';
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}
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$this->cpa = new MathCaptcha();
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add_action( 'um_after_register_fields', array( $this, 'add_field' ), 10, 1 );
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add_action( 'um_submit_form_errors_hook__registration', array( $this, 'validate' ), 10, 2 );
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}
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/**
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* Add Math Captcha field to the registration form.
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*
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* @param array $args UM form data.
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*/
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public function add_field( $args ) {
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$this->cpa->reset_captcha();
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$field_data = array(
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'type' => 'text',
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'label' => __( 'Solve this simple Math: ', 'um-math-captcha' ) . $this->cpa->get_captcha_text() . ' = ?',
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'name' => $this->key,
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'help' => '',
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'placeholder' => __( 'Your answer...', 'um-math-captcha' ),
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'icon' => '',
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'default' => null,
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'required' => true,
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'editable' => true,
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);
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$data = apply_filters( "um_get_field__{$this->key}", $field_data );
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?>
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<div class="um-field um-field-text">
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<?php echo UM()->fields()->field_label( $data['label'], $this->key, $data ); ?>
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<div class="um-field-area">
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<input type="text" name="<?php echo esc_attr( $data['name'] ); ?>" value="" placeholder="<?php echo esc_attr( $data['placeholder'] ); ?>" />
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</div>
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</div>
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<?php
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if ( UM()->fields()->is_error( $this->key ) ) {
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$text = UM()->fields()->show_error( $this->key );
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echo UM()->fields()->field_error( $text, $this->key );
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}
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}
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/**
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* Validate Math Captcha field when the registration form has been submitted.
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*
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* @param array $post_form Submission array.
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* @param array $form_data UM form data.
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*/
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public function validate( $post_form, $form_data ) {
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if ( empty( $post_form[ $this->key ] ) ) {
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UM()->form()->add_error( $this->key, __( 'Math Captcha is required.', 'um-math-captcha' ) );
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} elseif ( ! $this->cpa->validate( $post_form[ $this->key ] ) ) {
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UM()->form()->add_error( $this->key, __( 'Incorrect answer. Please try again.', 'um-math-captcha' ) );
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}
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}
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}

‎languages/um-math-captcha-de_DE.mo‎

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‎languages/um-math-captcha-de_DE.po‎

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msgid ""
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msgstr ""
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"Project-Id-Version: Ultimate Member - Math Captcha in Register form\n"
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"Report-Msgid-Bugs-To: \n"
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"POT-Creation-Date: 2023-10-28 21:51+0000\n"
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"PO-Revision-Date: 2023-10-29 10:20+0000\n"
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"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
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"Language-Team: Unknown\n"
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"Language: zxx\n"
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"Plural-Forms: nplurals=2; plural=n!=1;\n"
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"MIME-Version: 1.0\n"
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"Content-Type: text/plain; charset=UTF-8\n"
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"Content-Transfer-Encoding: 8bit\n"
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"X-Loco-Source-Locale: de_DE\n"
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"X-Generator: Loco https://localise.biz/\n"
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"X-Loco-Version: 2.6.6; wp-6.4-RC2\n"
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"X-Domain: um-math-captcha\n"
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"X-Loco-Parser: loco_parse_po"
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#. Author URI of the plugin
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msgid "http://ultimatemember.com/"
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msgstr ""
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#: includes/class-um-math-captcha.php:107
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msgid "Incorrect answer. Please try again."
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msgstr "Falsche Antwort. Bitte nochmal versuchen!"
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#: includes/class-um-math-captcha.php:105
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msgid "Math Captcha is required."
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msgstr "Mathe-Captcha ist erforderlich."
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#: includes/class-um-math-captcha.php:70
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msgid "Solve this simple Math: "
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msgstr "Lösen Sie diese einfache Rechnung:"
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#. %s - plugin name.
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#: um-math-captcha.php:39
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#, php-format
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msgid ""
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"The <strong>%s</strong> extension requires the Ultimate Member plugin to be "
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"activated to work properly. You can download it <a href=\"https://wordpress."
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"org/plugins/ultimate-member\">here</a>"
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msgstr ""
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"Das Ultimate Member-Plugin muss aktiviert sein, damit die <strong>%s</strong>"
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" Erweiterung richtig funktioniert. Du kannst es <a href=\"https://wordpress."
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"org/plugins/ultimate-member\">hier</a> herunterladen."
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#. Description of the plugin
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msgid "This plugin adds math challenge in the Register forms"
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msgstr "Dieses Plugin fügt Rechenaufgaben in das Registrier-Formular ein."
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#. Author of the plugin
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msgid "Ultimate Member"
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msgstr ""
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#. Name of the plugin
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msgid "Ultimate Member - Math Captcha in Register form"
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msgstr ""
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#: includes/class-um-math-captcha.php:78
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msgid "Your answer..."
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msgstr "Ihre Antwort..."

‎languages/um-math-captcha-en_US.mo‎

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‎languages/um-math-captcha-en_US.po‎

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msgid ""
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msgstr ""
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"Project-Id-Version: Ultimate Member - Math Captcha in Register form\n"
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"Report-Msgid-Bugs-To: \n"
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"POT-Creation-Date: 2023-10-28 21:51+0000\n"
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"PO-Revision-Date: 2023-10-28 21:52+0000\n"
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"Last-Translator: Denis Baran\n"
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"Language-Team: English (United States)\n"
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"Language: en_US\n"
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"Plural-Forms: nplurals=2; plural=n != 1;\n"
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"MIME-Version: 1.0\n"
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"Content-Type: text/plain; charset=UTF-8\n"
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"Content-Transfer-Encoding: 8bit\n"
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"X-Generator: Loco https://localise.biz/\n"
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"X-Loco-Version: 2.6.6; wp-6.4-RC2\n"
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"X-Domain: um-math-captcha"
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#. Author URI of the plugin
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msgid "http://ultimatemember.com/"
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msgstr ""
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#: includes/class-um-math-captcha.php:107
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msgid "Incorrect answer. Please try again."
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msgstr ""
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#: includes/class-um-math-captcha.php:105
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msgid "Math Captcha is required."
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msgstr ""
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#: includes/class-um-math-captcha.php:70
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msgid "Solve this simple Math: "
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msgstr ""
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#. %s - plugin name.
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#: um-math-captcha.php:39
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#, php-format
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msgid ""
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"The <strong>%s</strong> extension requires the Ultimate Member plugin to be "
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"activated to work properly. You can download it <a href=\"https://wordpress."
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"org/plugins/ultimate-member\">here</a>"
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msgstr ""
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#. Description of the plugin
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msgid "This plugin adds math challenge in the Register forms"
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msgstr ""
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#. Author of the plugin
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msgid "Ultimate Member"
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msgstr ""
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#. Name of the plugin
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msgid "Ultimate Member - Math Captcha in Register form"
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msgstr ""
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#: includes/class-um-math-captcha.php:78
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msgid "Your answer..."
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msgstr ""

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