ACF field filter query

March 25, 2024

$the_query = new WP_Query(array(
    'post_type'         => 'event',
    'posts_per_page'    => -1,
    'meta_key'          => 'featured',
    'orderby'           => 'meta_value',
    'order'             => 'DESC'
));

Filter by ACF field

$posts = get_posts(array(
    'posts_per_page'    => -1,
    'post_type'     => 'post',
    'meta_query'    => array(
        'relation'      => 'AND',
        array(
            'key'       => 'color',
            'value'     => array('red', 'orange'),
            'compare'   => 'IN',
        ),
        array(
            'key'       => 'featured',
            'value'     => '1',
            'compare'   => '=',
        ),
    ),
));

Sources:

https://www.advancedcustomfields.com/resources/query-posts-custom-fields/
https://www.advancedcustomfields.com/resources/order-posts-by-custom-fields/

get_posts() vs WP_Query

# loop, post, query
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$args are the same tho.

get_posts is a function that will return an array, when WP_Query is a class which will be used with the loop related functions.

Source:
- https://wordpress.stackexchange.com/questions/1753/when-should-you-use-wp-query-vs-query-posts-vs-get-posts#answer-1755
- https://developer.wordpress.org/reference/classes/wp_query/#parameters
$_GET / query variables

# functions.php, query, URL

March 26, 2024
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To retrieve $_GET parameters in a secure way, one can use get_query_var
```
get_query_var( string $query_var, mixed $default_value = '' ): mixed
```
The parameters would have first to be added to the public query variables available to WP_Query.
```
add_filter( 'query_vars', 'dev__pommes' );

function dev__pomme( $qvars ) {
	$qvars[] = 'pommes';
	return $qvars;
}
```
Source : https://developer.wordpress.org/reference/functions/get_query_var/

ACF field filter query

Order by ACF field

Filter by ACF field

get_posts() vs WP_Query

$_GET / query variables