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I got it… Turns out I was thinking too hard…
I re-read the documentation for get_fields().
Answer was that I don’t need to provide the full array as I was doing. Instead, the answer was to return ‘cb_roster’ like so:
$roster = get_fields('cb_roster', false, false); print_r($roster);
Which returns the array without formatting. The array without formatting looks like this:
Therefore, I only need to pass this script:
$value = '21'; array_push($roster, $value); update_field('cb_roster', $roster);
Sorry for the confusion…
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