multi_array_datetime_sort.php

/**
 * Sort a multidimensional array by datetime.
 * usage:
 *   usort($array, 'sortByOrder');
 */
function sortByDate($a, $b) {
	$t1 = strtotime($a['date']);
	$t2 = strtotime($b['date']);
    return $t1 - $t2;
}
 
 
/**
 * Sample
 */
$array = (
    array(
            'member id' => 2544,
            'table id' => 16,
            'date' => '2014-04-04 11:10:36'
        ),
    array(
            'member id' => 2544,
            'table id' => 15,
            'date' => '2014-04-04 11:10:36'
        ),
    array(
            'member id' => 2544,
            'table id' => 17,
            'date' => '2014-04-04 11:21:05'
        )
);
 
usort($array, 'sortByDate');