How to associate values from one array to another array as keys?

Question

So, to simply put it, it looks like this:

Array1:

Array
(
    [0] => id
    [1] => name
    [2] => email
)

Array2:

Array
(
    [0] => 1
    [1] => paula
    [2] => [email protected]

    [3] => 2
    [4] => martin
    [5] => [email protected]

    [6] => 3
    [7] => kasandra
    [8] => [email protected]

    [9] => 4
    [10] => helena
    [11] => [email protected]

    [12] => 5
    [13] => sophia
    [14] => [email protected]

    [15] => 6
    [16] => denis
    [17] => [email protected]
)

How to make those values from Array1 as keys in Array2 accordingly so that the end result looks like this:

Array
(
    [id] => 1
    [name] => paula
    [email] => [email protected]

    [id] => 2
    [name] => martin
    [email] => [email protected]

    [id] => 3
    [name] => kasandra
    [email] => [email protected]

    [id] => 4
    [name] => helena
    [email] => [email protected]

    [id] => 5
    [name] => sophia
    [email] => [email protected]

    [id] => 6
    [name] => denis
    [email] => [email protected]
)

In your sample you are overwriting on name and email index .. — ScaisEdge
– ScaisEdge, Commented Apr 1, 2018 at 16:35
I am not overwriting anything, I just have those two arrays....and i need to assoiciate the keys — lewis4u
– lewis4u, Commented Apr 1, 2018 at 16:36
Assume I have that third array. Now I'm writing $array['email']. Which one will it print? — Gynteniuxas
– Gynteniuxas, Commented Apr 1, 2018 at 16:37
Actually I need to have this as JSON objects {"id": 1, "name: "paula", "email": "[email protected]" } — lewis4u
– lewis4u, Commented Apr 1, 2018 at 16:38

lewis4u · Accepted Answer · 2018-04-01 16:47:20Z

2

you can use a for loop with step 3

  $numCoords  = count($array2)/3
  for ($i = 0; $i < $numCoords; $i++ ){
    $array[$i]['id'] = $array2[$i*3]; 
    $array[$i]['name'] = $array2[($i*3)+1]; 
    $array[$i]['email'] = $array2[($i*3)+2]; 
  }

edited Apr 1, 2018 at 16:47

lewis4u

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answered Apr 1, 2018 at 16:38

ScaisEdge

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14 Comments

lewis4u Over a year ago

I will try that now

lewis4u Over a year ago

Is it true or false that I can't have same keys in PHP array?

Gynteniuxas Over a year ago

@lewis4u True, you can't have the same key. The newer will overwrite the old one.

ScaisEdge Over a year ago

@lewis4u . i don't uderstand you comment

lewis4u Over a year ago

@scaisEdge which comment

|

ptica · Accepted Answer · 2018-04-01 17:36:21Z

1

I would go with array_chunk and get used to numeric indexes, but if you really want to have them as words you may map them:

$keys = [
    0 => 'id',
    1 => 'name',
    2 => 'email'
];

$chunked = array_chunk($array2, $length=3);
$result = array_map(function ($chunk) {
    global $keys;
    return array_combine($keys, $chunk);
}, $chunked);

edited Apr 1, 2018 at 17:36

answered Apr 1, 2018 at 17:30

ptica

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2 Comments

lewis4u Over a year ago

where do you come from ptica?

lewis4u Over a year ago

How to make this more dynamic? For example what if I have different number of attributes every time? instead of id, name and email there could be also additional properties

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