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<?php $unresponsives = [ [ "Customer", "172.52.46.75", "2022-04-01 16:20:45", "1817", "nxlog", "2328.02 Hours" ], [ "Customer", "172.25.89.45", "2022-04-01 16:20:45", "1817", "nxlog", "Undefined" ], [ "Customer", "172.19.10.94", "2022-04-01 16:20:45", "1817", "nxlog", "324.02 Hours" ], [ "Customer", "172.19.10.94", "2022-04-01 16:20:45", "1817", "nxlog", "2322.02 Hours" ], [ "Customer", "172.19.10.94", "2022-04-01 16:20:45", "1817", "nxlog", "Undefined" ], ]; $sortingArray = array_map(fn($a) => sscanf($a[5], '%f')[0] ?? PHP_INT_MAX, $unresponsives); array_multisort($sortingArray, SORT_DESC, $unresponsives); var_export($unresponsives);