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@ 2018-06-06T07:09:00Z

<?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){
            $i++;
            If($i>0){
                If(count($res[$i-1]) >1){
                    $periods[] = date($format, min($res[$i-1])) . " - " . date($format, max($res[$i-1]));
                }Else{
                    $periods[] = date($format, min($res[$i-1]));
                }
            }
        }
        $res[$i][] = $unix;
        $prev = $unix;
    }

    If(count(end($res)) >1){
        $periods[] = date($format, min(end($res))) . " - " . date($format, max(end($res)));
    }Else{
        $periods[] = date($format, min(end($res)));
    }
        
    Var_dump($periods);

Output for git.master, git.master_jit, rfc.property-hooks: array(3) { [0]=> string(19) "01/06/18 - 03/06/18" [1]=> string(19) "11/06/18 - 16/06/18" [2]=> string(8) "20/06/18" }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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