Must-use (mu) plugins are loaded during the version update process, unlike ordinary plugins. Explanation here. So it’s possible to hook dbdelta_queries and the related filters from within a mu plugin. (Thanks to Sergey Biryukov for the answer.) But, some plugins use the same dbDelta() function as core update, so it’s possible to get queries for … Read more
I believe Rarst is right. It sounds like you need to configure the wp-config.php file for the new database. Just go to the cpanel or other control panel of your hosting service, and use the address they use for the host address. If the database is on the same server as the web site, localhost … Read more
There is a DO_NOT_UPGRADE_GLOBAL_TABLES constant that going by documentation protects tables that are global in multisites (since they can grow large because of that), but I don’t see a clean way to prevent upgrade altogether. I’d work on getting that core clean of hacks instead.
It would be a challenge to hunt down a specific moment in time when that particular decision had been made. My educated guess would be that storing CPT definitions persistently would complicate how they interact with rest of APIs (especially Rewrite and localization). WP is also relatively conservative with database structure. CPT are relatively young … Read more
There are probably a few ways to do this. The easiest way I can think of is to install Pods Framework. You can install it through the WordPress repository like you’d normally install a plugin, or through GitHub. Using Pods, you can extend the WordPress user database to add a birthday field. You can also … Read more
You’re inserting raw POST data straight into an SQL query – sanitize, sanitize, sanitize! The code below should get you started, but I would advise you add some additional checks (is the email valid? are the strings too long? etc.): <?php $errors = $values = array(); if ( isset( $_POST[‘Submit’] ) ) { $fields = … Read more
Guess what! I just found what I was looking for and I’d like to share it with you. There is this newly-developed plugin that meets my needs (as described in my first post) and is fully customizable for other purposes as well. So, if you were also looking for such a solution, look no more! … Read more
In the plugin_options_validate() function the return value of get_option( ‘plugin_options’ ) is never used. Let’s step through the function by adding some comments: // Retrieve the options. $options = get_option(‘plugin_options’); // Replace the options without checking if // trim( $input[‘text_string’] ) and trim( $input[‘text_string_name’] ) // actually return strings and if $input[‘text_string’] and // $input[‘text_string_name’] … Read more
To upload a local WP installation to a server: Step 1 If you are on a host where you can expand an archived file (ie. Cpanel / File Manager) then easiest way is to ZIP or GZIP your entire WP install and upload it to the server, and use File Manager to expand the files … Read more
get_categories function will return an array of objects, each object a category. You can read more about it here: https://developer.wordpress.org/reference/functions/get_categories/ Edit And example, as Tim Malone mentioned in the comment there are examples on that page. But here is a simple one for you, that will display your categories in a list. $categories = get_categories(); … Read more