Global variable in vB5

[combat111]

Hello!
The problem is this: I need to output my variable anywhere in the template. The variable will receive a value from the database via a sql query. The question is: where do I need to declare this variable and how to make it so that I can display it in a template, like this: {vb: raw my_custom_variable}.
I create a product by the instructions in the core / packages folder, created a class there, etc. Tell me how to do it further so that my variable can be displayed later in the template. On the forums I found information that I need to do this, but it does not work, or I do it wrong:
$topheaderbar = 'my_data_from_database';
vB_Template::preRegister('header',array('topheaderbar' => $topheaderbar));
I really need help !!! Thank you!

[glennrocksvb]

I posted this How to create vB5 mod blog from a vB Support staff in the Useful Links module on the homepage here.

https://www.vbulletin.com/forum/blogs/joe-d/3932614-

Basically, you will add the variable to the global $page array.

[combat111]

Thank you so much! Happened! I could not at first understand what kind of variable hwWorld, now I realized that we add it to the array $page! Thanks again!

[combat111]

Tell me one more thing:
In the response form template, I added a hidden field to the form sending a response on the "enemy_field" forum. Screenshot: https://i.imgur.com/X8elj32.jpg
Now I want to send a value or other data associated with this field using the $_POST method. But the problem!
If in the root folder in index.php I include include 'my_custom_file.php'; and it receives $_POST ['enemy_field'] then everything works. But this is inconvenient, because when updating the file index.php will change and will have to re-include the file include 'my_custom_file.php';
And when I try to get $_POST ['enemy_field'] in my plugin /packages/my_plugin/api/page.php, it feels like my plugin does not get it and my idea does not work. I understand that internal vBulletin files and plugins are protected from receiving and passing _POST inside the engine. Is there any way to enable this or can I use some other method of receiving this POST request? Thanks in advance for the answer !!!

[glennrocksvb]

Try extending the add() function in the content API instead of fetchPageById() in the page API. The add() function is called when submitting a post and from there you might be able to get the POST data.