数组合并递归php

Question

Can anyone tell me how i can convert the first array to second array using php array operations.

First array :-

Array
(
    [0] => Array
        (
            [actual_release_date] => 2013-06-07 00:00:00
            [distributors] => 20th Century Fox / 20th Century Fox Animation / Fox 2000 Pictures / Fox Searchlight
        )

    [1] => Array
        (
            [actual_release_date] => 2013-06-28 11:11:00
            [distributors] => 20th Century Fox / 20th Century Fox Animation / Fox 2000 Pictures / Fox Searchlight
        )
)

Second array:-

Array
(
    [0] => Array
        (
            [actual_release_date] => array( 0=>2013-06-07 00:00:00 , 1=> 2013-06-28 11:11:00 )
            [distributors] => 20th Century Fox / 20th Century Fox Animation / Fox 2000 Pictures / Fox Searchlight
        )
)

If the second element is common, and first element is different, then we have to group it in one array.

Thanks in advance.

Answer 1

You can use array_reduce

$data = array_reduce($data, function ($a, $b) {
    if (isset($a[$b['distributors']])) {
        $a[$b['distributors']]['actual_release_date'][] = $b['actual_release_date'];
    } else {
        $a[$b['distributors']]['actual_release_date'] = array($b['actual_release_date']);
        $a[$b['distributors']]['distributors'] = $b['distributors'];
    }
    return $a;
}, array());

print_r(array_values($data));

Output

Array
(
    [0] => Array
        (
            [actual_release_date] => Array
                (
                    [0] => 2013-06-07 00:00:00
                    [1] => 2013-06-28 11:11:00
                )

            [distributors] => 20th Century Fox / 20th Century Fox Animation / Fox 2000 Pictures / Fox Searchlight
        )

)

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