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@ 2019-08-15T10:32:53Z

<?php

$array = [
    [
        "id" => "food,Travel",
        "names" => "chimpanzee"
    ],
    [
        "id" => "food",
        "name" => "meeting"
    ],
    [
        "id" => "Z1",
        "name" => "dynasty"
    ],
    [
        "id" => "X",
        "name" => "chocolate"
    ],
    [
        "id" => "Travel",
        "name" => "bananas"
    ],
    [
        "id" => "Travel",
        "name" => "fantasy"
    ],
    [
        "id" => "Travel",
        "name" => "football"
    ]
];

$newarray= [];

foreach($array as $key => $value) {

    if(is_array(explode(",", $value["id"]))) {
        foreach(explode(",", $value["id"]) as $category) {
            $newarray[$category][$key] = $value;
            $newarray[$category][$key]["id"] = $category;
        }
    } else {
        $newarray[$value["id"]][$key] = $value;
    }

}

var_dump($newarray);

Output for git.master, git.master_jit, rfc.property-hooks: array(4) { ["food"]=> array(2) { [0]=> array(2) { ["id"]=> string(4) "food" ["names"]=> string(10) "chimpanzee" } [1]=> array(2) { ["id"]=> string(4) "food" ["name"]=> string(7) "meeting" } } ["Travel"]=> array(4) { [0]=> array(2) { ["id"]=> string(6) "Travel" ["names"]=> string(10) "chimpanzee" } [4]=> array(2) { ["id"]=> string(6) "Travel" ["name"]=> string(7) "bananas" } [5]=> array(2) { ["id"]=> string(6) "Travel" ["name"]=> string(7) "fantasy" } [6]=> array(2) { ["id"]=> string(6) "Travel" ["name"]=> string(8) "football" } } ["Z1"]=> array(1) { [2]=> array(2) { ["id"]=> string(2) "Z1" ["name"]=> string(7) "dynasty" } } ["X"]=> array(1) { [3]=> array(2) { ["id"]=> string(1) "X" ["name"]=> string(9) "chocolate" } } }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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