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Editorial Team
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Asked: 2026-06-09T06:47:27+00:00

I have an array Array ( [0] => Array ( [id_session] => 174 [id_participant]

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I have an array

Array
(
    [0] => Array
        (
            [id_session] => 174
            [id_participant] => 191
            [participant] => A[mail1@xy.com]
        )

    [1] => Array
        (
            [id_session] => 175
            [id_participant] => 177
            [participant] => B[mail2@xy.com]
        )

    [2] => Array
        (
            [id_session] => 175
            [id_participant] => 189
            [participant] => C[mail3@xy.com]
        )

)

I wan to get the json or an multiple dim array

Array
(
    [174] => Array([191]=>A[mail1@xy.com]),
    [175] => Array
        (            
            [177] => B[mail2@xy.com],
            [189] => C[mail3@xy.com]
        )

)

Anyone could help me how do that?

thanks

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1 Answer

  1. Editorial Team
    // initialize the array which will contain the result
$resultArray = [];
foreach($sourceArray as $item) {
    // if there is no item in the array with the session is init the item
    if (!array_key_exists($item['id_session'], $resultArray)) {
        $resultArray[$item['id_session']] = [];
    }

    // add the item to the result
    $resultArray[$item['id_session']][$item['id_participant']] = $item['participant'];
}

    Note that I have used the new array syntax. If you are using PHP < 5.4 you should replace [] by array().

    Demo

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