$location = wp_sanitize_redirect( $location );
 
        if ( ! $is_IIS && 'cgi-fcgi' !== PHP_SAPI ) {
            status_header( $status ); // This causes problems on IIS and some FastCGI setups.
        }
 
        /**
         * Filters the X-Redirect-By header.
         *
         * Allows applications to identify themselves when they're doing a redirect.
         *
         * @since 5.1.0
         *
         * @param string|false $x_redirect_by The application doing the redirect or false to omit the header.
         * @param int          $status        Status code to use.
         * @param string       $location      The path to redirect to.
         */
        $x_redirect_by = apply_filters( 'x_redirect_by', $x_redirect_by, $status, $location );
        if ( is_string( $x_redirect_by ) ) {
            header( "X-Redirect-By: $x_redirect_by" );
        }
 
        header( "Location: $location", true, $status );
 
        return true;
    }
endif;
 
if ( ! function_exists( 'wp_sanitize_redirect' ) ) :
    /**
     * Sanitizes a URL for use in a redirect.
     *
     * @since 2.3.0
     *
     * @param string $location The path to redirect to.
     * @return string Redirect-sanitized URL.
     */
    function wp_sanitize_redirect( $location ) {
        // Encode spaces.
        $location = str_replace( ' ', '%20', $location );

     * @return bool False if the redirect was canceled, true otherwise.
     */
    function wp_safe_redirect( $location, $status = 302, $x_redirect_by = 'WordPress' ) {
 
        // Need to look at the URL the way it will end up in wp_redirect().
        $location = wp_sanitize_redirect( $location );
 
        /**
         * Filters the redirect fallback URL for when the provided redirect is not safe (local).
         *
         * @since 4.3.0
         *
         * @param string $fallback_url The fallback URL to use by default.
         * @param int    $status       The HTTP response status code to use.
         */
        $fallback_url = apply_filters( 'wp_safe_redirect_fallback', admin_url(), $status );
 
        $location = wp_validate_redirect( $location, $fallback_url );
 
        return wp_redirect( $location, $status, $x_redirect_by );
    }
endif;
 
if ( ! function_exists( 'wp_validate_redirect' ) ) :
    /**
     * Validates a URL for use in a redirect.
     *
     * Checks whether the $location is using an allowed host, if it has an absolute
     * path. A plugin can therefore set or remove allowed host(s) to or from the
     * list.
     *
     * If the host is not allowed, then the redirect is to $fallback_url supplied.
     *
     * @since 2.8.1
     *
     * @param string $location     The redirect to validate.
     * @param string $fallback_url The value to return if $location is not allowed.
     * @return string Redirect-sanitized URL.
     */
    function wp_validate_redirect( $location, $fallback_url = '' ) {

             * @param string $location The URL to redirect the user to.
             * @param int    $status   The HTTP Status to set. Default 302.
             * @param string $context  Unique string provided by the caller to help filter conditions.
             */
            if ( apply_filters( 'learndash_safe_redirect_nocache_header', true, $location, $status, $context ) ) {
                nocache_headers();
            }
 
            /**
             * Filters to override using the WordPress function wp_safe_redirect().
             *
             * @since 3.3.0.2
             *
             * @param bool   true      True to call wp_safe_redirect().
             * @param string $location The URL to redirect the user to.
             * @param int    $status   The HTTP Status to set. Default 302.
             * @param string $context  Unique string provided by the caller to help filter conditions.
             */
            if ( apply_filters( 'learndash_use_wp_safe_redirect', LEARNDASH_USE_WP_SAFE_REDIRECT, $location, $status, $context ) ) {
                $redirect_status = wp_safe_redirect( $location, $status );
            } else {
                $redirect_status = wp_redirect( $location, $status ); //phpcs:ignore WordPress.Security.SafeRedirect.wp_redirect_wp_redirect
            }
 
            if ( $redirect_status ) {
                if ( $exit ) {
                    exit;
                }
            }
 
            // Only here if $exit is not true.
            return $redirect_status;
        }
    }
    return false;
}
 
/**
 * Utility function to determine if we are using the Select2 library on selects.
 *

 * @param int $post_id The ID of the resource that belongs to a course.
 *
 * @return boolean|void Returns true if the user has access to the course.
 */
function sfwd_lms_access_redirect( $post_id ) {
    $access = sfwd_lms_has_access( $post_id );
    if ( true === $access ) {
        return true;
    }
 
    $link = get_permalink( learndash_get_course_id( $post_id ) );
    /**
     * Filters the course redirect URL after checking access.
     *
     * @param string $link    The course URL a user is redirected to it has access.
     * @param int    $post_id Post ID.
     */
    $link = apply_filters( 'learndash_access_redirect', $link, $post_id );
    if ( ! empty( $link ) ) {
        learndash_safe_redirect( $link );
    }
}
 
/**
 * Checks whether the user's access to the course is expired.
 *
 * @since 2.1.0
 *
 * @param int $course_id Course ID.
 * @param int $user_id   User ID.
 *
 * @return bool Returns true if the access is expired otherwise false.
 */
function ld_course_access_expired( $course_id, $user_id ) {
    $course_access_upto = ld_course_access_expires_on( $course_id, $user_id );
 
    if ( empty( $course_access_upto ) ) {
        return false;
    } else {
        if ( time() >= $course_access_upto ) {

                return;
            }
 
            if ( $post_type === $this->post_type ) {
                if ( is_robots() ) {
                    /**
                     * Display the robots.txt file content. (wp core action)
                     *
                     * @since 2.1.0
                     *
                     * @link https://codex.wordpress.org/Function_Reference/do_robots
                     */
                    do_action( 'do_robots' ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- WordPress Core hook
                } elseif ( is_trackback() ) {
                    include ABSPATH . 'wp-trackback.php';
                } elseif ( ! empty( $wp->query_vars['name'] ) ) {
                    // single.
                    if ( in_array( $post_type, learndash_get_post_types( 'course_steps' ), true ) ) {
                        global $post;
                        sfwd_lms_access_redirect( $post->ID );
                        $course_id = learndash_get_course_id( $post->ID );
                        if ( ! empty( $course_id ) ) {
                            learndash_course_exam_challenge_redirect( $course_id );
                        }
                    } elseif ( learndash_get_post_type_slug( 'course' ) === $post_type ) {
                        learndash_course_exam_challenge_redirect( $post->ID );
                    } elseif ( learndash_get_post_type_slug( 'exam' ) === $post_type ) {
                        learndash_exam_challenge_view_permission( $post->ID );
                    }
                }
            }
        } // end template_redirect_access()
 
        /**
         * Amend $wp_query based on what content user is viewing
         *
         * If archive for post type of this instance, set order and posts per page
         * If post archive, don't display certificates
         *
         * @since 2.1.0

 
        $this->iterations[ $nesting_level ] = $this->priorities;
 
        $num_args = count( $args );
 
        do {
            $this->current_priority[ $nesting_level ] = current( $this->iterations[ $nesting_level ] );
 
            $priority = $this->current_priority[ $nesting_level ];
 
            foreach ( $this->callbacks[ $priority ] as $the_ ) {
                if ( ! $this->doing_action ) {
                    $args[0] = $value;
                }
 
                // Avoid the array_slice() if possible.
                if ( 0 === $the_['accepted_args'] ) {
                    $value = call_user_func( $the_['function'] );
                } elseif ( $the_['accepted_args'] >= $num_args ) {
                    $value = call_user_func_array( $the_['function'], $args );
                } else {
                    $value = call_user_func_array( $the_['function'], array_slice( $args, 0, $the_['accepted_args'] ) );
                }
            }
        } while ( false !== next( $this->iterations[ $nesting_level ] ) );
 
        unset( $this->iterations[ $nesting_level ] );
        unset( $this->current_priority[ $nesting_level ] );
 
        --$this->nesting_level;
 
        return $value;
    }
 
    /**
     * Calls the callback functions that have been added to an action hook.
     *
     * @since 4.7.0
     *
     * @param array $args Parameters to pass to the callback functions.

        } while ( false !== next( $this->iterations[ $nesting_level ] ) );
 
        unset( $this->iterations[ $nesting_level ] );
        unset( $this->current_priority[ $nesting_level ] );
 
        --$this->nesting_level;
 
        return $value;
    }
 
    /**
     * Calls the callback functions that have been added to an action hook.
     *
     * @since 4.7.0
     *
     * @param array $args Parameters to pass to the callback functions.
     */
    public function do_action( $args ) {
        $this->doing_action = true;
        $this->apply_filters( '', $args );
 
        // If there are recursive calls to the current action, we haven't finished it until we get to the last one.
        if ( ! $this->nesting_level ) {
            $this->doing_action = false;
        }
    }
 
    /**
     * Processes the functions hooked into the 'all' hook.
     *
     * @since 4.7.0
     *
     * @param array $args Arguments to pass to the hook callbacks. Passed by reference.
     */
    public function do_all_hook( &$args ) {
        $nesting_level                      = $this->nesting_level++;
        $this->iterations[ $nesting_level ] = $this->priorities;
 
        do {
            $priority = current( $this->iterations[ $nesting_level ] );

    if ( ! isset( $wp_filter[ $hook_name ] ) ) {
        if ( isset( $wp_filter['all'] ) ) {
            array_pop( $wp_current_filter );
        }
 
        return;
    }
 
    if ( ! isset( $wp_filter['all'] ) ) {
        $wp_current_filter[] = $hook_name;
    }
 
    if ( empty( $arg ) ) {
        $arg[] = '';
    } elseif ( is_array( $arg[0] ) && 1 === count( $arg[0] ) && isset( $arg[0][0] ) && is_object( $arg[0][0] ) ) {
        // Backward compatibility for PHP4-style passing of `array( &$this )` as action `$arg`.
        $arg[0] = $arg[0][0];
    }
 
    $wp_filter[ $hook_name ]->do_action( $arg );
 
    array_pop( $wp_current_filter );
}
 
/**
 * Calls the callback functions that have been added to an action hook, specifying arguments in an array.
 *
 * @since 2.1.0
 *
 * @see do_action() This function is identical, but the arguments passed to the
 *                  functions hooked to `$hook_name` are supplied using an array.
 *
 * @global WP_Hook[] $wp_filter         Stores all of the filters and actions.
 * @global int[]     $wp_actions        Stores the number of times each action was triggered.
 * @global string[]  $wp_current_filter Stores the list of current filters with the current one last.
 *
 * @param string $hook_name The name of the action to be executed.
 * @param array  $args      The arguments supplied to the functions hooked to `$hook_name`.
 */
function do_action_ref_array( $hook_name, $args ) {

<?php
/**
 * Loads the correct template based on the visitor's url
 *
 * @package WordPress
 */
if ( wp_using_themes() ) {
    /**
     * Fires before determining which template to load.
     *
     * @since 1.5.0
     */
    do_action( 'template_redirect' );
}
 
/**
 * Filters whether to allow 'HEAD' requests to generate content.
 *
 * Provides a significant performance bump by exiting before the page
 * content loads for 'HEAD' requests. See #14348.
 *
 * @since 3.5.0
 *
 * @param bool $exit Whether to exit without generating any content for 'HEAD' requests. Default true.
 */
if ( 'HEAD' === $_SERVER['REQUEST_METHOD'] && apply_filters( 'exit_on_http_head', true ) ) {
    exit;
}
 
// Process feeds and trackbacks even if not using themes.
if ( is_robots() ) {
    /**
     * Fired when the template loader determines a robots.txt request.
     *
     * @since 2.1.0
     */
    do_action( 'do_robots' );
    return;
} elseif ( is_favicon() ) {
    /**

<?php
/**
 * Loads the WordPress environment and template.
 *
 * @package WordPress
 */
 
if ( ! isset( $wp_did_header ) ) {
 
    $wp_did_header = true;
 
    // Load the WordPress library.
    require_once __DIR__ . '/wp-load.php';
 
    // Set up the WordPress query.
    wp();
 
    // Load the theme template.
    require_once ABSPATH . WPINC . '/template-loader.php';
 
}
 

<?php
/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 *
 * @package WordPress
 */
 
/**
 * Tells WordPress to load the WordPress theme and output it.
 *
 * @var bool
 */
define( 'WP_USE_THEMES', true );
 
/** Loads the WordPress Environment and Template */
require __DIR__ . '/wp-blog-header.php';