Array Sorting PHP by timestamp

use usort that accepts custom function to sort arrays:

usort

your function may look something like:

function cmp($a, $b)
{
    if ($a[2] == $b[2]) {
        return 0;
    }
    return ($a[2] < $b[2]) ? -1 : 1;
}

here an array_multisort example:

foreach ($array as $key => $node) {
   $timestamps[$key]    = $node[2];
}
array_multisort($timestamps, SORT_ASC, $array);

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