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@ 2020-12-20T22:14:46Z

<?php

$firstarray = array (
    0 => 
    array (
        0 => '2020-12-01',
        1 => 24.00
    ),
    1 => 
    array (
        0 => '2020-12-05',
        1 => 16.00
    ),
    2 => 
    array (
        0 => '2020-12-07',
        1 => 12.00
    ),
    3 => 
    array (
        0 => '2020-12-15',
        1 => 0.00
    ),
    4 => 
    array (
        0 => '2020-12-16',
        1 => 0.00
    ),
    5 => 
    array (
        0 => '2020-12-16',
        1 => 100.00
    )
);
$secondarray = array (
    0 => 
    array (
        0 => 
        array (
            0 => '2020-12-01',
            1 => '2020-12-05',
            2 => 42.00
        ),
        1 => 
        array (
            0 => '2020-12-06',
            1 => '2020-12-08',
            2 => 35.00
        ),
        2 => 
        array (
            0 => '2020-12-09',
            1 => '2020-12-12',
            2 => 76.00
        ),
    ),
        1 => 
        array (
            0 => 
            array (
                0 => '2020-12-01',
                1 => '2020-12-05',
                2 => 42.00
            ),
            1 => 
            array (
                0 => '2020-12-06',
                1 => '2020-12-08',
                2 => 35.00
            ),
            2 => 
            array (
                0 => '2020-12-09',
                1 => '2020-12-12',
                2 => 76.00
            ),
        ),
        2 => 
            array (
                0 => 
                array (
                    0 => '2020-12-04',
                    1 => '2020-12-09',
                    2 => 10.00
                ),
                1 => 
                array (
                    0 => '2020-12-10',
                    1 => '2020-12-13',
                    2 => 45.00
                ),
            ),
                3 => 
                array (
                    0 => 
                    array (
                        0 => '2020-12-04',
                        1 => '2020-12-09',
                        2 => 10.00
                    ),
                    1 => 
                    array (
                        0 => '2020-12-10',
                        1 => '2020-12-13',
                        2 => 45.00
                    ),
                    ),
                4 =>    array (
                        0 => 
                        array (
                            0 => '2020-12-04',
                            1 => '2020-12-09',
                            2 => 10.00
                        ),
                        1 => 
                        array (
                            0 => '2020-12-10',
                            1 => '2020-12-13',
                            2 => 45.00
                        ),
                        ),
                        5 =>
                        array (
                            0 => 
                            array (
                                0 => '2020-12-01',
                                1 => '2020-12-05',
                                2 => 42.00
                            ),
                            1 => 
                            array (
                                0 => '2020-12-06',
                                1 => '2020-12-08',
                                2 => 35.00
                            ),
                            2 => 
                            array (
                                0 => '2020-12-09',
                                1 => '2020-12-12',
                                2 => 76.00
            )
        )
    
);

$prices = array();
foreach ($firstarray as $key => $value) {
    $price = $value[1];
    foreach ($secondarray[$key] as $range) {
        if ($value[0] >= $range[0] && $value[0] <= $range[1]) {
            $price = $range[2];
        }
    }
    $prices[] = $price;
}

print_r($prices);

Output for 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] => 42 [1] => 42 [2] => 10 [3] => 0 [4] => 0 [5] => 100 )

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94.03 ms | 1372 KiB | 4 Q