WordPress plugin to tag category while posting - wordpress

Question

I'm not a big programmer, but this week get in touch with Openai. It's my first experience with AI. I tried to create code that works as a Wordpress plugin to meet a need.
I make a lot of posts and each post I have to mark the same category. Then I thought that there should be a plugin to mark the category so that when I need to post again, the category would already have its checkbox checked, so I wouldn't need to scroll the selection box of the categories and mark the same category.
Openai generated this code, it didn't work, from what I noticed the cookie is not being created.
Plugin Name: Category Marker
Description: Checks the checkbox of the previously marked category when making a post
Version: 0.1
Author:
*/
//This is the first function
function catemarcada_create_cookie() {
global $post;
if ( isset( $post ) && 'post-new.php' == basename( $_SERVER['SCRIPT_FILENAME'] ) ) {
// Create cookie when making a post
if ( isset( $post->ID ) ) {
$categoryID = get_post_meta($post->ID, '_category_id', true);
setcookie( 'catemarcada', $categoryID, time() + (86400 * 30), "/"); // 86400 = 1 day
}
}
}
add_action( 'wp_loaded', 'catemarcada_create_cookie' );
//This is the second function
function catemarcada_get_cookie() {
global $post;
if ( isset( $post ) && 'post-new.php' == basename( $_SERVER['SCRIPT_FILENAME'] ) ) {
// Get cookie when accessing the post-new.php file
if ( isset( $_COOKIE['catemarcada'] ) ) {
$categoryfound = $_COOKIE['catemarcada'];
}
}
}
add_action( 'wp_loaded', 'catemarcada_get_cookie' );
//This is the third function
function catemarcada_check_category() {
global $post;
if ( isset( $post ) && 'post-new.php' == basename( $_SERVER['SCRIPT_FILENAME'] ) ) {
// Compare the value of the cookie with the category IDs in the WordPress database
$categories = get_categories();
foreach ( $categories as $category ) {
if ( $categoryfound == $category->cat_ID ) {
// Check the checkbox field of the category in the WordPress database
echo '<input type="checkbox" name="'.$category->cat_ID.'" checked="checked" />';
}
}
}
}
add_action( 'wp_loaded', 'catemarcada_check_category' );
// Redirect to post-new.php
add_action('post_updated', 'redirect_post_new', 10, 3);
function redirect_post_new( $post_id, $post, $update ){
if( $update ){
wp_redirect( admin_url( 'post-new.php' ) );
exit();
}
}
This is the description of the plugin I asked to be generated:
Write PHP code that works as a Wordpress plugin. The plugin will only work when I access the “post-new.php” file.
First function:
When making a post, the plug-in will create a cookie with the name “catemarcada”.
This cookie will store the selected category ID during text posting. The cookie must expire within 360 days.
Second function:
When accessing the “post-new.php” file, check if the cookie named “catemarcada” already exists. If it exists, do not create it again.
And every time I access the “post-new.php” file, the plug-in will look up the ID that was recorded in the cookie named “catemarcada” and record the ID in a variable called “categoryfound”.
Third function:
The plug-in should compare the ID that is in the variable called “categoryfound” with the IDs of the categories in the Wordpress database.
If the ID that is in the variable called “categoryfound” is the same as the ID of any of the categories in the Wordpress database, check the checkbox field of the category in the Wordpress database in question.
When making a post, redirect to the post-new.php file.