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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);

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