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@ 2019-05-14T11:58:02Z

<?php

$a = [
  1 => [
    "opens_at" => "10:00",
    "closes_at" => "18:00"
  ],
  2 => [
    "opens_at" => "10:00",
    "closes_at" => "18:00"
  ],
  3 => [
    "opens_at" => "10:00",
    "closes_at" => "18:00"
  ],
  4 => [
    "opens_at" => "14:00",
    "closes_at" => "17:00"
  ],
  5 => [
    "opens_at" => "14:00",
    "closes_at" => "17:00"
  ],
  6 => [
    "opens_at" => "18:00",
    "closes_at" => "19:00"
  ]
];

$groups = [];

foreach($a as $dayNumber => $w){
    if(!array_key_exists($w['opens_at'] . '-' . $w['closes_at'], $groups)){
        $groups[$w['opens_at'] . '-' . $w['closes_at']] = [];
    }
    
    $groups[$w['opens_at'] . '-' . $w['closes_at']][] = $dayNumber;
}

$res = array_map(function($v){
    return implode(', ', $v);
}, $groups);

var_dump(array_flip($res));

Output for git.master, git.master_jit, rfc.property-hooks: array(3) { ["1, 2, 3"]=> string(11) "10:00-18:00" ["4, 5"]=> string(11) "14:00-17:00" [6]=> string(11) "18:00-19:00" }

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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