Online PHP editor | output for gHDC0

<?php $arr = ["01/06/18", "02/06/18", "03/06/18", "11/06/18","12/06/18", "13/06/18", "14/06/18", "15/06/18","16/06/18", "20/06/18"]; $i =-1; $prev =0; $format = "d/m/y"; Foreach($arr as $val){ $dt = date_create_from_format ($format , $val); $unix = date_timestamp_get($dt); If($unix -$prev > 86400){ $i++; } $res[$i][] = $unix; $prev = $unix; } Foreach($res as $period){ If(count($period) >1){ $periods[] = date($format, min($period)) . " - " . date($format, max($period)); }Else{ $periods[] = date($format, min($period)); } } Var_dump($periods);