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@ 2018-10-18T15:51:55Z

<?php

$array = [                                                                       
    '2018-10-03' => 5,                                                           
    '2018-10-06' => 5,                                                           
    '2018-10-09' => 5,                                                           
    '2018-10-03' => 4,                                                           
];                                                                               
                                                                                 
$rotate = [];                                                                    
foreach ($array as $date => $value) {                                            
    $rotate[$value][] = $date;                                                   
}                                                                                
$group = [];                                                                     
foreach ($rotate as $value => $dates) {                                          
    $group[] = [ 'start' => min($dates), 'end' => max($dates), 'value' => $value ];
}                                                                                
                                                                                 
var_dump($rotate);                                                            
var_dump($group);

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { [4]=> array(1) { [0]=> string(10) "2018-10-03" } [5]=> array(2) { [0]=> string(10) "2018-10-06" [1]=> string(10) "2018-10-09" } } array(2) { [0]=> array(3) { ["start"]=> string(10) "2018-10-03" ["end"]=> string(10) "2018-10-03" ["value"]=> int(4) } [1]=> array(3) { ["start"]=> string(10) "2018-10-06" ["end"]=> string(10) "2018-10-09" ["value"]=> int(5) } }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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