Debug LearnDash Quiz Certificates

debug_learndash_quiz_certificates.php

<?php
/**
 * Debug LearnDash Quiz Certificates.
 *
 * Enter the Quiz ID and User ID into the [debug_learndash_quiz_certificate] shortcode.
 * If the user has earned the certificate for the quiz, the shortcode will return
 * the Certificate Download link.
 *
 * Clicking the link should open the generated certificate PDF according to the
 * certificate settings in the quiz.
 *
 * Example of usage:
 *
 * [debug_learndash_quiz_certificate quiz_id="123" user_id="321"]
 *
 * Replace quiz_id="123" and user_id="321" with the correct IDs.
 */

/**
 * Debug a LearnDash quiz certificate for any user.
 *
 * @param array $atts Shortcode attributes.
 * @return string Certificate link HTML.
 */
add_shortcode( 'debug_any_user_quiz_certificate', function ( $atts ) {
    $atts = shortcode_atts(
        array(
            'quiz_id' => 0,
            'user_id' => 0,
        ),
        $atts
    );

    $quiz_id = intval( $atts['quiz_id'] );
    $user_id = intval( $atts['user_id'] );

    return debug_learndash_certificate( $quiz_id, $user_id );
} );

/**
 * Debug a LearnDash quiz certificate for any user.
 *
 * @param int $quiz_post_id The LearnDash Quiz post ID.
 * @param int $user_id The user ID to check certificate for.
 *
 * @return string The certificate link HTML if available.
 */
function debug_learndash_quiz_certificate( $quiz_post_id, $user_id ) {
    // Ensure quiz post ID and user ID are integers to prevent errors.
    $quiz_post_id = intval( $quiz_post_id );
    $user_id = intval( $user_id );

    // Check if the quiz post exists and is of the correct type.
    $quiz_post = get_post( $quiz_post_id );
    if ( ! ( $quiz_post instanceof WP_Post ) || 'sfwd-quiz' !== $quiz_post->post_type ) {
        return 'Invalid quiz post ID.';
    }

    // Fetch the certificate details for the specified user.
    $certificate_details = learndash_certificate_details( $quiz_post_id, $user_id );

    // Check if certificate details are available.
    if ( empty( $certificate_details ) || empty( $certificate_details['certificateLink'] ) ) {
        return 'No certificate available for this user and quiz.';
    }

    // Return the certificate link.
    return "<a href='{$certificate_details['certificateLink']}'>Print Certificate</a>";
}