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@ 2020-03-30T20:15:14Z

<?php
$data = [
    [
        'rates' => [1, 2],
        'origin' => 1,
    ],
    [
        'rates' => [3, 4],
        'origin' => 2,
    ],
    [
        'rates' => [5],
        'origin' => 3,
    ],
];



$result = [];
foreach ($data[0]['rates'] as $rate) {
    $tmp = [
        'rate' => $rate,
        'origin' => $data[0]['origin'],
    ];

    rates($tmp, [$data[1], $data[2]]);
}

function rates(array $baseRate, array $nextData): void
{
    global $result;

    for ($i = 0; $i < count($nextData); ++$i) {
        foreach ($nextData[$i]['rates'] as $rate) {
            $tmp = [];
            $tmp[] = $baseRate;
            $tmp[] = [
                'rate' => $rate,
                'origin' => $nextData[$i]['origin'],
            ];

            for ($j = 0; $j < count($nextData); ++$j) {
                if ($i === $j) {
                    continue;
                }

                foreach ($nextData[$j]['rates'] as $subRate) {
                    $tmp[] = [
                        'rate' => $subRate,
                        'origin' => $nextData[$j]['origin'],
                    ];
                }
            }

            $result[] = $tmp;
        }
    }
}


\print_r($result);




$expected = [
    [
        [
            'rate' => 1,
            'origin' => 1,
        ],
        [
            'rate' => 3,
            'origin' => 2,
        ],
        [
            'rate' => 5,
            'origin' => 3,
        ],
    ],
    [
        [
            'rate' => 1,
            'origin' => 1,
        ],
        [
            'rate' => 4,
            'origin' => 2,
        ],
        [
            'rate' => 5,
            'origin' => 3,
        ],
    ],
    [
        [
            'rate' => 2,
            'origin' => 1,
        ],
        [
            'rate' => 3,
            'origin' => 2,
        ],
        [
            'rate' => 5,
            'origin' => 3,
        ],
    ],
    [
        [
            'rate' => 2,
            'origin' => 1,
        ],
        [
            'rate' => 4,
            'origin' => 2,
        ],
        [
            'rate' => 5,
            'origin' => 3,
        ],
    ],
];

Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: Array ( [0] => Array ( [0] => Array ( [rate] => 1 [origin] => 1 ) [1] => Array ( [rate] => 3 [origin] => 2 ) [2] => Array ( [rate] => 5 [origin] => 3 ) ) [1] => Array ( [0] => Array ( [rate] => 1 [origin] => 1 ) [1] => Array ( [rate] => 4 [origin] => 2 ) [2] => Array ( [rate] => 5 [origin] => 3 ) ) [2] => Array ( [0] => Array ( [rate] => 1 [origin] => 1 ) [1] => Array ( [rate] => 5 [origin] => 3 ) [2] => Array ( [rate] => 3 [origin] => 2 ) [3] => Array ( [rate] => 4 [origin] => 2 ) ) [3] => Array ( [0] => Array ( [rate] => 2 [origin] => 1 ) [1] => Array ( [rate] => 3 [origin] => 2 ) [2] => Array ( [rate] => 5 [origin] => 3 ) ) [4] => Array ( [0] => Array ( [rate] => 2 [origin] => 1 ) [1] => Array ( [rate] => 4 [origin] => 2 ) [2] => Array ( [rate] => 5 [origin] => 3 ) ) [5] => Array ( [0] => Array ( [rate] => 2 [origin] => 1 ) [1] => Array ( [rate] => 5 [origin] => 3 ) [2] => Array ( [rate] => 3 [origin] => 2 ) [3] => Array ( [rate] => 4 [origin] => 2 ) ) )

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