PHP - Multiple uasort functions breaks sorting

Question

I have a multidimensional array that stores people.

Array (
   id93294 => (array (
             Name => \"Tom Anderson\",
             Birthday => \         


        

Answer 1

Many years later, there is a cleaner, more succinct technique provided from PHP7+ ...the spaceship operator and balanced arrays of "criteria".

Code: (Demo)

uasort($array, function($a, $b) {
    return [strtotime($a['Birthday']), $a['Hometown'] !== $a['CurrentLocation'], $a['Name']]
           <=>
           [strtotime($b['Birthday']), $b['Hometown'] !== $b['CurrentLocation'], $b['Name']];
});
var_export($array);

See the demo link for sample input and the output.

This snippet will sort by:

1. Birthday ASC then
2. Hometown === CurrentLocation before not === then
3. Name ASC

Note: #2 has !== syntax only because false evaluation are treated as 0 and true evaluations are treated as 1.

If you need to change any of the sorting orders for any of the criteria, just swap the $a and $b at the corresponding elements.