Online PHP editor | rfc for dR6L3

@ 2019-11-01T20:12:22Z

<?php

$startingArray = [
    [   "subject" => "Physics",
        "student" => [
            ["id" => "00003", "Name" => "Peter", "email" => "peter@schooool.com",],
            ["id" => "00004", "Name" => "Mary", "email" => "mary@schooool.com",],
            ["id" => "00005", "Name" => "Jane", "email" => "jane@schooool.com",],
        ]
    ],
    [   "subject" => "Chemistry",
        "student" => [
            ["id" => "00003", "Name" => "Peter", "email" => "peter@schooool.com",],
            ["id" => "00004", "Name" => "Mary", "email" => "mary@schooool.com",],
            ["id" => "00005", "Name" => "Jane", "email" => "jane@schooool.com",],
        ]
    ],
    [   "subject" => "Mathematics",
        "student" => [
            ["id" => "00003", "Name" => "Peter", "email" => "peter@schooool.com",],
            ["id" => "00006", "Name" => "Fred", "email" => "fred@schooool.com",],
            ["id" => "00007", "Name" => "Wilma", "email" => "wilma@schooool.com",],
        ]
    ],
    [   "subject" => "Biology",
        "student" => [
            ["id" => "00004", "Name" => "Mary", "email" => "mary@schooool.com",],
            ["id" => "00006", "Name" => "Fred", "email" => "fred@schooool.com",],
            ["id" => "00008", "Name" => "Alison", "email" => "alison@schooool.com",],
        ]
    ]
];

$newArray = [];
foreach ($startingArray as $item) {
    foreach ($item['student'] as $student) {
        if (empty($newArray[$student['id']])) {
            $student['subjects'] = [];
            $newArray[$student['id']] = $student;
        }
        
        $newArray[$student['id']]['subjects'][] = $item['subject'];
    }
}

print_r($newArray);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [00003] => Array ( [id] => 00003 [Name] => Peter [email] => peter@schooool.com [subjects] => Array ( [0] => Physics [1] => Chemistry [2] => Mathematics ) ) [00004] => Array ( [id] => 00004 [Name] => Mary [email] => mary@schooool.com [subjects] => Array ( [0] => Physics [1] => Chemistry [2] => Biology ) ) [00005] => Array ( [id] => 00005 [Name] => Jane [email] => jane@schooool.com [subjects] => Array ( [0] => Physics [1] => Chemistry ) ) [00006] => Array ( [id] => 00006 [Name] => Fred [email] => fred@schooool.com [subjects] => Array ( [0] => Mathematics [1] => Biology ) ) [00007] => Array ( [id] => 00007 [Name] => Wilma [email] => wilma@schooool.com [subjects] => Array ( [0] => Mathematics ) ) [00008] => Array ( [id] => 00008 [Name] => Alison [email] => alison@schooool.com [subjects] => Array ( [0] => Biology ) ) )

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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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