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@ 2019-08-22T10:15:46Z

<?php

$arr = array (
  0 => 
  array (
    0 => 'Consultant',
    1 => 'Inv. num.',
    2 => 'Order',
    3 => 'Due',
    12 => 'Currency',
    13 => 'File',
    21 => 'First name',
    22 => 'Last name',
    27 => 'ID',
    28 => 'Birthdate',
    29 => 'Postcode',
    30 => 'City',
    31 => 'Address',
    36 => 'Mobile',
    37 => 'Email',
  ),
  1 => 
  array (
    0 => '18642',
    1 => '9376533321',
    2 => '27.05.2019.',
    3 => '28.06.2019.',
    12 => 'Currency1',
    13 => '109,43',
    21 => 'Name1',
    22 => 'Lastname1',
    27 => '18977',
    28 => 'Birhtdate1',
    29 => 'Postcode1',
    30 => 'City1',
    31 => 'Address1',
    36 => 'Mobile1',
    37 => 'mail@mail.com',
  ),
  2 => 
  array (
    0 => '186625',
    1 => '5638871123',
    2 => '17.06.2019.',
    3 => '03.07.2019.',
    12 => 'Currency2',
    13 => '235,33',
    21 => 'Name2',
    22 => 'Lastname2',
    27 => '18954',
    28 => 'Birthdate2',
    29 => 'Postcode2',
    30 => 'City2',
    31 => 'Address2',
    36 => 'Mobile2',
    37 => 'mail@mail2',
  ),
);

$order = [21, 22, 27, 28, 29, 30, 31, 36, 37, 0, 1, 2, 3, 13, 12];
foreach($order as $index => $key){
        $keys[$index] = $arr[0][$key]; 
}
$values = array_slice($arr,1,2);

// associate
foreach($values as &$items){
    foreach($order as $index => $key){
        $new[$index] = $items[$key]; 
    }
    $items = array_combine($keys, $new);
    
}


var_dump($values);

Output for 7.1.25 - 7.1.31, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: array(2) { [0]=> array(15) { ["First name"]=> string(5) "Name1" ["Last name"]=> string(9) "Lastname1" ["ID"]=> string(5) "18977" ["Birthdate"]=> string(10) "Birhtdate1" ["Postcode"]=> string(9) "Postcode1" ["City"]=> string(5) "City1" ["Address"]=> string(8) "Address1" ["Mobile"]=> string(7) "Mobile1" ["Email"]=> string(13) "mail@mail.com" ["Consultant"]=> string(5) "18642" ["Inv. num."]=> string(10) "9376533321" ["Order"]=> string(11) "27.05.2019." ["Due"]=> string(11) "28.06.2019." ["File"]=> string(6) "109,43" ["Currency"]=> string(9) "Currency1" } [1]=> &array(15) { ["First name"]=> string(5) "Name2" ["Last name"]=> string(9) "Lastname2" ["ID"]=> string(5) "18954" ["Birthdate"]=> string(10) "Birthdate2" ["Postcode"]=> string(9) "Postcode2" ["City"]=> string(5) "City2" ["Address"]=> string(8) "Address2" ["Mobile"]=> string(7) "Mobile2" ["Email"]=> string(10) "mail@mail2" ["Consultant"]=> string(6) "186625" ["Inv. num."]=> string(10) "5638871123" ["Order"]=> string(11) "17.06.2019." ["Due"]=> string(11) "03.07.2019." ["File"]=> string(6) "235,33" ["Currency"]=> string(9) "Currency2" } }

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