Question About Multiple Sorting in Word Press - php

Question

I have a page that shows standings for an online Fifa league, the standings should be sorted by Points and then Goal Differential. I collect the data for Wins, Draws, Losses, Goals For and Goals against. Here is my code -
<?php
$args = array(
'post_type' => 'post',
'cat' => '5',
'numberposts' => 12,
'meta_query' => array(
'relation' => 'AND',
'_fifa_w' => array(
'key' => '_fifa_w',
),
'_fifa_d' => array(
'key' => '_fifa_d',
),
'_fifa_gf' => array(
'key' => '_fifa_gf',
),
'_fifa_ga' => array(
'key' => '_fifa_ga',
),
),
'orderby' => array(
'_fifa_w' => 'DESC',
'_fifa_d' => 'DESC',
'_fifa_gf' => 'ASC',
'_fifa_ga' => 'DESC'
)
);
$product_posts = get_posts( $args );
?>
This sorts by total points but does nothing for the goal differential. If I exclude _fifa_w (wins) and _fifa_d (draws) from the code like this -
'orderby' => array(
'_fifa_gf' => 'ASC',
'_fifa_ga' => 'DESC'
)
);
Then it sorts by goal differential properly.
How can I get it to all work togetheR?

Answer 1

Try:
'orderby' => '_fifa_w _fifa_d _fifa_gf-_fifa_ga',
'order' => 'DESC'
I don't use Wordpress, but the idea is to sort by the first two columns normally, then sort on the calculated difference between the goalsfor and goals against.
Probably a good idea not to blindly trust me, but to eyeball the rendered query to be sure that Wordpress isn't backtick-wrapping the mathematical expression. Maybe $wp_query->request will show you what is being rendered.
Otherwise, there is always the php option of usort() on your result set.