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@ 2024-10-02T00:26:17Z

<?php

function partial(callable $callable, ...$initialargs): callable {
    return fn (...$args) => $callable(...$initialargs, ...$args);
}

$data = [
    [
        'quiz' => 2,
        'question' => 7,
        'notif' => 'sup'
    ],
    [
        'quiz' => 3,
        'question' => 7,
        'notif' => 'pus'
    ],
    [
        'quiz' => 2,
        'question' => 3,
        'notif' => 'yoyoyo'
    ]
];

$keys = fn(array $data, string $key): callable => partial(array_keys(...), array_column($data, $key));
$indices = fn(array $data, string $key): array => array_map($keys($data, $key), array_column($data, $key, $key));
$map = fn(array $data): callable => partial(array_map(...), fn(int $i): array => $data[$i]);
$byx = fn(array $data, string $x): array => array_map($map, $indices($data, $x));

$byquiz = $byx($data, 'quiz');
$byquizandquestion = array_map(fn($d) => $byx($d, 'question'), $byquiz);
print_r($byquizandquestion);

Output for git.master_jit, git.master: Fatal error: Uncaught TypeError: {closure:/in/McAek:28}(): Argument #1 ($data) must be of type array, Closure given, called in /in/McAek on line 31 and defined in /in/McAek:28 Stack trace: #0 /in/McAek(31): {closure:/in/McAek:28}(Object(Closure), 'question') #1 [internal function]: {closure:/in/McAek:31}(Object(Closure)) #2 /in/McAek(31): array_map(Object(Closure), Array) #3 {main} thrown in /in/McAek on line 28
Process exited with code 255.

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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