php json解码排序依据

Question

function mySort($a, $b) {
 if (strtolower($a->n) == strtolower($b->n)) return 0;
 return (strtolower($a->n) < strtolower($b->n)) ? -1 : 1;
}

This works well for some json data like this

$txt = '[{"n":"1"},{"n":"2"},{"n":"3"},{"n":"4"},{"n":"5"},{"n":"6"},{"n":"7"},{"n":"8"},{"n":"9"},{"n":"10"},{"n":"11"}]
$j = json_decode($txt);
usort($j, 'mySort');
foreach ($j as $k=>$v) {
    echo $v->n.'<br />';//1 2 3 4 5 6 7 8 9 10 11
}

But when some data like this:

$txt = '[{"n":"a 1"},{"n":"a 2"},{"n":"a 3"},{"n":"a 4"},{"n":"a 5"},{"n":"a 6"},{"n":"a 7"},{"n":"a 8"},{"n":"a 9"},{"n":"a 10"},{"n":"a 11"}]';
$j = json_decode($txt);
usort($j, 'mySort');
foreach ($j as $k=>$v) {
    echo $v->n.'<br />';//a 1  a 10  a 11  a 2  a 3  a 4  a 5  a 6  a 7  a 8  a 9
}

I need a sort as

a 1  a 2  a 3  a 4  a 5  a 6  a 7  a 8  a 9  a 10  a 11

Thanks.

Answer 1

Or even simpler, use strnatcmp. It performs natural ordering and compare the elements in a way that seems natural to humans.

Example:

function mySort($a, $b) {
  return strnatcmp($a->n, $b->n);
}