Traversal-a message board question written in PHP

Traversing the PHP array database

So, I'm writing a message board with PHP, submitting it to PHP with a form and writing it to the database with the account number and title and content.
Then I want to extract it and show it to the page (this is also written in PHP). But I don't know how to mention power and traverse.
I think one way to do this is:
$user =mysql_fetch_array (mysql_query ("Select username from Message"), Mysql_num);
$title =mysql_fetch_array (mysql_query ("Select title from Message"), Mysql_num);
$content =mysql_fetch_array (mysql_query ("Select content from Message"), Mysql_num);
The three arrays are then traversed. This allows you to display the page in the format you like. But I found only one record was extracted when I extracted the database.
What should I write? Ask the Great God!!!

