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@ 2024-09-09T04:04:33Z

<?php

$arr = [ 
    'history' => [
        'id' => 23452435,
        'legend' => [
            ['player' => 'me', 'turn' => 1, 'card' => ['name' => 'foo']],
            ['player' => 'me', 'turn' => 1, 'card' => ['name' => 'bar']],
            ['player' => 'opponent', 'turn' => 1, 'card' => ['name' => 'derp']],
            ['player' => 'opponent', 'turn' => 2, 'card' => ['name' => 'hoo']],
        ],
    ]
];

$historyByTurns = array();
foreach ($arr['history'] as $historyItem) {
    foreach ($historyItem['legend'] as $legendItem) {
        $turn = $legendItem['turn'];
        $player = $legendItem['player'];
        if (!array_key_exists($turn, $historyByTurns)) {
            $historyByTurns[$turn] = array();
        }
        if (!array_key_exists($player, $historyByTurns[$turn])) {
            $historyByTurns[$turn][$player] = array();
        }
        foreach ($legendItem as $card) {
            $historyByTurns[$turn][$player][] = $card['name'];
        }
    }
}
var_export($historyByTurns);

Output for git.master_jit, git.master, rfc.property-hooks: Warning: Trying to access array offset on int in /in/kH0BS on line 17 Warning: foreach() argument must be of type array|object, null given in /in/kH0BS on line 17 Warning: Undefined array key "legend" in /in/kH0BS on line 17 Warning: foreach() argument must be of type array|object, null given in /in/kH0BS on line 17 array ( )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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