Write a WordPress code snippet that adds a post Expiration Date for a certain category of post and when the expiration date is passed the post is turned to draft

					<?php

<?php

namespace WPTurbo;

class PostExpiration {

    const EXPIRATION_META_KEY = '_expiration_date';

    // Constructor to initialize actions
    public function __construct() {
        add_action( 'init', [$this, 'check_post_expiration'] ); // Check post expiration on init
        add_action( 'add_meta_boxes', [$this, 'add_expiration_meta_box'] ); // Add a meta box for expiration date
        add_action( 'save_post', [$this, 'save_expiration_date'] ); // Save the expiration date when the post is saved
    }

    // Adds a meta box for the expiration date in the post edit screen
    public function add_expiration_meta_box( $post ) {
        // Check if the post belongs to the specified category
        if ( 'promotions' === get_the_category( $post->ID )[0]->slug ) {
            add_meta_box(
                'expiration_date',
                __('Post Expiration Date', 'wpturbo'), // Title of the meta box
                [$this, 'render_expiration_meta_box'], // Callback function for rendering the box
                null,
                'side',
                'high' // Context and priority for the meta box
            );
        }
    }

    // Renders the meta box for setting the expiration date
    public function render_expiration_meta_box( $post ) {
        $expiration_date = get_post_meta( $post->ID, self::EXPIRATION_META_KEY, true ); // Get the current expiration date
        wp_nonce_field( 'save_expiration_date', 'expiration_date_nonce' ); // Security field for saving data
        echo '<label for="expiration_date">' . __('Expiration Date:', 'wpturbo') . '</label>'; // Label for the input
        echo '<input type="date" id="expiration_date" name="expiration_date" value="' . esc_attr( $expiration_date ) . '" />'; // Date input for setting the expiration date
    }

    // Saves the expiration date when the post is saved
    public function save_expiration_date( $post_id ) {
        // Verify nonce for security
        if ( ! isset( $_POST['expiration_date_nonce'] ) || ! wp_verify_nonce( $_POST['expiration_date_nonce'], 'save_expiration_date' ) ) {
            return; // Exit if verification fails
        }

        // Check if the expiration date is set and save it
        if ( isset( $_POST['expiration_date'] ) ) {
            update_post_meta( $post_id, self::EXPIRATION_META_KEY, sanitize_text_field( $_POST['expiration_date'] ) ); // Save the sanitized expiration date
        }
    }

    // Checks for expired posts and updates their status
    public function check_post_expiration() {
        $args = [
            'category_name' => 'YOUR_CATEGORY_SLUG', // Target category slug
            'post_status' => 'publish', // Only published posts
            'posts_per_page' => -1, // Retrieve all posts
        ];

        $posts = get_posts( $args ); // Get posts based on the query

        // Loop through each post to check for expiration
        foreach ( $posts as $post ) {
            $expiration_date = get_post_meta( $post->ID, self::EXPIRATION_META_KEY, true ); // Get the expiration date

            // Check if the expiration date has passed
            if ( ! empty( $expiration_date ) && strtotime( $expiration_date ) < time() ) {
                // Set the post status to draft if expired
                $post->post_status = 'draft';
                wp_update_post( $post ); // Update the post status in the database
            }
        }
    }
}

new PostExpiration(); // Instantiate the class