Online PHP editor | output for N6E6D

@ 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 5.6.38, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: 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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