usort issue with decimal numbers

Question

I\'m currently trying to sort a multidimensional array by its subvalues. The structure of the array is:

[0] => Array
    (
        [id] => 87
        [         


        

Answer 1

See usort docs. Float result will be converted to integer. For correct work use this code:

usort(
    $data, 
    function($a, $b) {
        $result = 0;
        if ($a[$_GET['sortby']] > $b[$_GET['sortby']]) {
            $result = 1;
        } else if ($a[$_GET['sortby']] < $b[$_GET['sortby']]) {
            $result = -1;
        }
        return $result; 
    }
);