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I understand WP well enough to create a custom theme at a basic level, but have no experience with the core code. I've also just finished a book on basic php and mysql coding.
I'd like to look 'under the hood' of WP to try and put those together. Can someone tell me:
mysqli_connect ...)get_header() function? (which I assume will have something like include(header.php) )Thanks!
First off, the usual caveat -- Don't modify core code. (Certainly not on a production site.)
If you read the documentation on the Codex, you'll notice that most if not all of the pages in, say, the Function Reference have a section called Source File. Clicking the link located there will take you to the file in trac where the particular function lives.
For instance, the Codex page for the_ID() points you to wp-includes/post-template.php.
Your specific questions:
$wpdb() class is in wp-includes/wp-db.php.get_header() is in wp-includes/general-template.php.Sometimes, though, you'll have to hunt all over the WordPress codebase to follow the track of how does this work? You'll find that functions call other functions, which call other functions, which apply filters, and so forth. There's a lot of digging, sometimes, to understand how something in WordPress actually works. Do it. It's worth it.
get_header() is still located in the same place, so your answer is still correct. But if I would add the function get_nav() in the same way as that get_header() and get_footer() are written, create such a nav file in the correct folder, and call the function on the pages, do you think that would suffice for it to work? Quite often I need to have the nav outside of the header in the source code.
Apr 22 at 10:18
wordpressfolder in your favorite code editor and do a global search. And follow @Patj suggestions bellow.