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mishterk /
Last active Dec 30, 2020
Dynamically set the ACF JSON directory so that each sub-site in a WordPress multisite network has a separate acf-json dir. This maximises compatibility with ACF Custom Database Tables.

Using ACF JSON on WordPress multisite installations

ACF JSON can get a little messy where you need different field groups across your sub-sites. If you are using separate themes or separate child themes for each sub-site, you'll be fine as long as each theme/child-theme has its own /acf-json directory.

If, however, you want to enforce unique acf-json directories for each sub-site, you can do so using one of the following snippets.

  1. Dynamic ACF JSON directory
mishterk / PostTypeTaxonomyMirror.php
Created Dec 17, 2020
Post type/taxonomy mirror.
View PostTypeTaxonomyMirror.php
class PostTypeTaxonomyMirror {
private $post_type;
private $taxonomy;
mishterk / wplk-get-current-domain-id.php
Last active Dec 12, 2020
An example of getting the current domain post ID in WP Landing Kit. Might be of use if you are loading up ACF fields on a domain post or something similar.
View wplk-get-current-domain-id.php
// e.g; ''
$current_host = $_SERVER['HTTP_HOST'];
// This will return a WPLK_Domain object, if the domain can be found. Otherwise, NULL.
$domain = wplk_get_domain( );
$domain_id = $domain->post_id();
mishterk / sql-in-wordpress-example-01.sql
Last active Dec 7, 2020
In A beginner's guide to using SQL to query the WordPress database — — we take a look at the basics of SQL and how to use it within WordPress safely.
View sql-in-wordpress-example-01.sql
SELECT * FROM some_table_name;
mishterk / acfcdt-prefix-post-title-with-meta-id.php
Created Nov 26, 2020
Prefixing a WordPress post title with the ID of an ACF Custom Database Tables meta data row.
View acfcdt-prefix-post-title-with-meta-id.php
add_action( 'acf/save_post', function ( $post_id ) {
global $wpdb;
// Get the meta ID from the custom DB table.
$table_name = 'my_custom_db_table';
$meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT `id` FROM {$wpdb->prefix}{$table_name} WHERE `post_id` = %d", $post_id ) );
// Choose a prefix format.
mishterk / advanced-forms-pro-prefill-fields-using-custom-data.php
Created Oct 21, 2020
How to use ACF Forms to manage non ACF controlled meta fields with Advanced Forms Pro.
View advanced-forms-pro-prefill-fields-using-custom-data.php
add_filter( 'af/field/prefill_value', 'prefill_form_field', 10, 4 );
* @param mixed $value
* @param array $field
* @param array $form
* @param array $args
mishterk / advanced-forms-pro-dynamic-user-editing.php
Last active Oct 21, 2020
Using a custom query parameter to dynamically specify a user ID for editing with Advanced Forms Pro.
View advanced-forms-pro-dynamic-user-editing.php
add_filter( 'af/form/args', 'afp_demo_support_dynamic_user_editing', 10, 2 );
* @param array $args
* @param array $form
* @return array
mishterk / register-wordpress-admin-columns.php
Created Oct 14, 2020
A quick snippet for registering custom admin columns for a post type in WordPress.
View register-wordpress-admin-columns.php
$post_type = 'my-post-type';
add_filter( 'manage_' . $post_type . '_posts_columns', function ( $defaults ) {
$defaults['custom-one'] = 'One';
$defaults['custom-two'] = 'Two';
return $defaults;
} );
mishterk / filter-repeater-sub-fields-before-insert-into-custom-database-tables.php
Last active Aug 4, 2020
How to filter repeater sub field values before they are stored in a custom table in ACF Custom Database Tables version 1.1
View filter-repeater-sub-fields-before-insert-into-custom-database-tables.php
add_filter( 'acfcdt/filter_value_before_update', 'xyz_filter_repeater_value_before_insert', 10, 3 );
* @param mixed $value The field value being stored.
* @param string $selector Either the post ID or a compound ACF selector depending on the object type. e.g; user_1.
* @param array $field_array The ACF field array.
* @return mixed
mishterk / _markup.html
Created May 20, 2020
Delegate jQuery event handlers when working with dynamic content. For more info see
View _markup.html
<div class="PostsGrid">
<!-- This is our div containing our post items -->
<div class="PostsGrid__posts">
<a href="#" class="PostsGrid__post"><!-- …Post grid item here… --></a>
<a href="#" class="PostsGrid__post"><!-- …Post grid item here… --></a>
<a href="#" class="PostsGrid__post"><!-- …Post grid item here… --></a>
<!-- A button to load more posts -->