# booking/11.2/includes/_capacity/captcha_simple_text.php
Booking Calendar, version 11.2. 291 lines.
- Page: https://pluginprobe.com/plugins/booking/11.2/code/includes/_capacity/captcha_simple_text.php
- Raw: https://pluginprobe.com/plugins/booking/11.2/raw/includes/_capacity/captcha_simple_text.php
- Modified: 2026-01-27T09:13:32+00:00
Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/booking/11.2/code/includes/_capacity/captcha_simple_text.php#L10-L20`.
```php
'...', 'captcha_chalange'=> '...']
* @param $is_from_admin_panel true | false
* @param $original_ajx_search_params usually $_REQUEST[ $request_prefix ]
*
* @return void wp_send_json() TO front-end or skip and continue
*/
function wpbc_captcha__in_ajx__check( $request_params, $is_from_admin_panel , $original_ajx_search_params ) {
if (
( ( 'On' === get_bk_option( 'booking_is_use_captcha' ) ) || ( WPBC_NEW_FORM_BUILDER ) ) &&
( ! $is_from_admin_panel ) &&
( ( isset( $original_ajx_search_params['captcha_user_input'] ) ) && ( isset( $original_ajx_search_params['captcha_chalange'] ) ) )
) {
if ( ! wpbc_captcha__simple__is_ansfer_correct( $request_params['captcha_user_input'], $request_params['captcha_chalange'] ) ) {
$captcha_arr = wpbc_captcha__simple__generate_new();
$ajx_data_arr = array();
$ajx_data_arr['status'] = 'error';
$ajx_data_arr['status_error'] = 'captcha_simple_wrong';
$ajx_data_arr['captcha__simple'] = $captcha_arr;
$ajx_data_arr['ajx_after_action_message'] = __( 'The code you entered is incorrect', 'booking' );
$ajx_data_arr['ajx_after_action_message_status'] = 'warning';
wp_send_json(
array(
'ajx_data' => $ajx_data_arr,
'ajx_search_params' => $original_ajx_search_params,
'ajx_cleaned_params' => $request_params,
'resource_id' => $request_params['resource_id'],
)
);
// After this page will die;.
}
}
}
// ---------------------------------------------------------------------------------------------------------------------
// CAPTCHA Support
// ---------------------------------------------------------------------------------------------------------------------
/**
* Is entered CAPTCHA correct ?
*
* @param string $captcha_user_input user entrance
* @param string $captcha_chalange chalange
*
* @return bool
*/
function wpbc_captcha__simple__is_ansfer_correct( $captcha_user_input, $captcha_chalange ) {
if ( ( empty( $captcha_user_input ) ) || ( empty( $captcha_chalange ) ) ) {
return false;
}
$captcha_instance = new wpdevReallySimpleCaptcha();
$correct = $captcha_instance->check( $captcha_chalange, $captcha_user_input );
return $correct;
}
/**
* Generate new CAPTCHA image and return URL to this image and challenge code
*
* @return array [
'url' => $captcha_url,
'challenge' => $captcha_challenge
]
*/
function wpbc_captcha__simple__generate_new() {
$captcha_instance = new wpdevReallySimpleCaptcha();
// Clean up dead files older than 2 minutes
$captcha_instance->cleanup( 2 ); // FixIn: 7.0.1.67.
//$captcha_instance->img_size = array( 72, 24 );
/* Background color of CAPTCHA image. RGB color 0-255 */
//$captcha_instance->bg = array( 0, 0, 0 );//array( 255, 255, 255 );
/* Foreground (character) color of CAPTCHA image. RGB color 0-255 */
//$captcha_instance->fg = array( 255, 255, 255 );//array( 0, 0, 0 );
/* Coordinates for a text in an image. I don't know the meaning. Just adjust. */
//$captcha_instance->base = array( 6, 18 );
/* Font size */
//$captcha_instance->font_size = 14;
/* Width of a character */
//$captcha_instance->font_char_width = 15;
/* Image type. 'png', 'gif' or 'jpeg' */
//$captcha_instance->img_type = 'png';
$word = $captcha_instance->generate_random_word();
$prefix = wp_rand();
$captcha_instance->generate_image( $prefix, $word );
$filename = $prefix . '.png';
$captcha_url = WPBC_PLUGIN_URL . '/js/captcha/tmp/' . $filename;
$captcha_challenge = substr( $filename, 0, strrpos( $filename, '.' ) );
return array(
'url' => $captcha_url,
'challenge' => $captcha_challenge
);
}
/**
* Generate initial HTML content for CAPTCHA in booking form
*
* @param $resource_id
*
* @return string|true
*/
function wpbc_captcha__simple__generate_html_content( $resource_id ) {
if ( true !== wpbc_captcha__simple__is_installed() ) {
return wpbc_captcha__simple__is_installed();
}
$captcha_arr = wpbc_captcha__simple__generate_new();
$captcha_url = $captcha_arr['url'];
$captcha_challenge = $captcha_arr['challenge'];
$html = '';
$html .= '';
$html .= '';
// phpcs:ignore PluginCheck.CodeAnalysis.ImageFunctions.NonEnqueuedImage
$html .= '
';
$html .= '';
return $html;
}
/**
* Check if captcha can work here
*
* @return string|true if true then can work, Otherwise return error message
*/
function wpbc_captcha__simple__is_installed() {
// FixIn: 8.8.3.5.
if ( function_exists( 'gd_info' ) ) {
return true;
/*
$gd_info = gd_info();
if ( isset( $gd_info['GD Version'] ) ) {
$gd_info = $gd_info['GD Version'];
} else {
$gd_info = wp_json_encode( $gd_info );
}
*/
} else {
return 'Error! CAPTCHA requires the GD library activated in your PHP configuration.'
.'Please check more here.';
}
}
/**
* Decide if CAPTCHA can be shown for current request/context.
*
* Rules:
* - Must be enabled in settings (booking_is_use_captcha = On)
* - Must not be a WP Admin page, except plugin settings form page
*
* @return bool
*/
function wpbc_booking_form_is_captcha_allowed_here() {
if ( ( 'On' !== get_bk_option( 'booking_is_use_captcha' ) ) && ( ! WPBC_NEW_FORM_BUILDER ) ) {
return false;
}
// In admin area we usually do not show CAPTCHA, except settings form page.
// if ( is_admin() && ( ! wpbc_is_settings_form_page() ) ) { return false; } //.
// old URI-based logic for edge cases, keep it as extra guard:.
$server_request_uri = ( isset( $_SERVER['REQUEST_URI'] ) ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Missing
// Optional legacy-style admin URI check.
$admin_uri = ltrim( str_replace( get_site_url( null, '', 'admin' ), '', admin_url( 'admin.php?' ) ), '/' );
if ( ( '' !== $server_request_uri ) && ( false !== strpos( $server_request_uri, $admin_uri ) ) && ( ! wpbc_is_settings_form_page() ) ) {
return false;
}
return true;
}
/**
* Default CAPTCHA placeholder replacement for booking form HTML.
*
* Replaces [captcha] token with generated CAPTCHA markup (if enabled),
* or removes the token when CAPTCHA is disabled/not allowed in current context.
*
* Add-ons can:
* - Replace HTML entirely by filtering 'wpbc_booking_form_captcha_html'
* - Or override this whole replacement by using a lower priority on
* 'wpbc_booking_form_html__create_captha' / '__create_captcha'
*
* @param string $form_html Booking form HTML.
* @param int $resource_id Booking resource ID.
*
* @return string
*/
function wpbc_booking_form_html__create_captcha_default( $form_html, $resource_id ) {
if ( false === strpos( $form_html, '[captcha]' ) ) {
return $form_html;
}
$resource_id = (int) $resource_id;
// If CAPTCHA is not allowed here, remove placeholder.
if ( ! wpbc_booking_form_is_captcha_allowed_here() ) {
return str_replace( '[captcha]', '', $form_html );
}
/**
* Filter: Provide CAPTCHA HTML for booking form.
*
* Return non-empty string to supply your own CAPTCHA markup (addons).
* Return empty string to let WPBC fallback to the built-in simple CAPTCHA.
*
* @param string $captcha_html CAPTCHA HTML (empty by default).
* @param int $resource_id Booking resource ID.
* @param array $args Context args.
*/
$captcha_html = apply_filters( 'wpbc_booking_form_captcha_html', '', $resource_id,
array(
'context' => 'booking_form',
'placeholder' => '[captcha]',
)
);
if ( '' === $captcha_html ) {
// Core fallback (your existing generator).
$captcha_html = wpbc_captcha__simple__generate_html_content( $resource_id );
}
return str_replace( '[captcha]', $captcha_html, $form_html );
}
add_filter( 'wpbc_booking_form_html__create_captcha', 'wpbc_booking_form_html__create_captcha_default', 10, 2 );
/**
* How an add-on supplies a different CAPTCHA (example).
* add_filter( 'wpbc_booking_form_captcha_html', 'my_addon_wpbc_captcha_html', 20, 3 );
*
*
* Provide custom CAPTCHA HTML (e.g., reCAPTCHA/hCaptcha).
*
* @param string $captcha_html Current HTML (empty by default).
* @param int $resource_id Booking resource ID.
* @param array $args Context args.
*
* @return string
*
* function my_addon_wpbc_captcha_html( $captcha_html, $resource_id, $args ) {
*
* // Only replace on booking form rendering context.
* if ( empty( $args['context'] ) || ( 'booking_form' !== $args['context'] ) ) {
* return $captcha_html;
* }
*
* // Return your custom markup here.
* return '...
';
* }
*/
```