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@ 2018-02-13T02:28:36Z

<?php
$dates=[
  '2017-02-28',  // group1
  '2017-03-01',  // group1
  '2017-04-03',  // group2
  '2017-04-04',  // group2
  '2017-04-06',  // group3
  '2017-04-08',  // group4
  '2017-04-09',  // group4
  '2017-04-10'   // group4
];

foreach($dates as $date){
    if(!isset($grouped)){  // first group
        $i=0;  // first group, index is zero
    }elseif($date!=date("Y-m-d",strtotime("$date_checker +1 day"))){  // if non-consecutive
        ++$i;  // next group, index is incremented
    }
    $grouped[$i][]=$date_checker=$date;  // store date as temporary date checker and into appropriate group
}

foreach($grouped as $group){
    $result[]=current($group)." to ".end($group);
}

/*
foreach($grouped as $group){
    $result[current($group)." to ".end($group)]=$group;
}
*/

var_export($result);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => '2017-02-28 to 2017-03-01', 1 => '2017-04-03 to 2017-04-04', 2 => '2017-04-06 to 2017-04-06', 3 => '2017-04-08 to 2017-04-10', )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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