PHP combine two multidimensional arrays and use one array as key

Question

I would like to combine two multidimensional arrays in a way that in the resulting array, array1 values serve as keys for array2.

These are two example arrays:

$array1 = array(
   array('data1'),
   array('data2'),
   array('data3')
);

$array2 = array(
   array('5','12','4'),
   array('8','2','17'),
   array('20','15','3')
);

The resulting array should look like this:

$array = array(
   'data1' => array('5','12','4'),
   'data2' => array('8','2','17'),
   'data3' => array('20','15','3')
);

How could I achieve this? Thanks!

zenwraight · Accepted Answer · 2017-05-14 01:18:49Z

2

You can do something like this

$array = [];
$count = count($array1);
for($index = 0; $index < $count; $index++)
{
   $array[$array1[$index][0]] = $array2[$index];
}

This should do what you are trying to achieve

answered May 14, 2017 at 1:18

zenwraight

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Comments

LF-DevJourney · Accepted Answer · 2017-05-14 01:45:53Z

1

You can use array_combine to combine keys and values to an new array. You can check the live demo here.

array_combine(array_map(function($v){return $v[0];},$array1), $array2);

answered May 14, 2017 at 1:45

LF-DevJourney

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Comments

Junius L · Accepted Answer · 2017-05-14 01:55:34Z

1

Use array_map(), which lets you use user defined function.

<?php

$array1 = array(
    array('data1'),
    array('data2'),
    array('data3')
);

$array2 = array(
    array('5', '12', '4'),
    array('8', '2', '17'),
    array('20', '15', '3')
);

function mapArray($array1, $array2) {
    return [$array1[0] => $array2];
}

$new_arr = array_map("mapArray", $array1, $array2);

Output

answered May 14, 2017 at 1:55

Junius L

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Comments

mickmackusa · Accepted Answer · 2021-02-22 07:39:27Z

0

This can be succinctly accomplished using just two native php functions. The only step before calling array_combine() is to reduce the depth of your first array. To extract the first value from each subarray, just call array_column() and specify that you want all of the 0-keyed values.

Code: (Demo)

$array1 = [['data1'], ['data2'], ['data3']];
$array2 = [['5', '12', '4'], ['8', '2', '17'], ['20', '15', '3']];

var_export(
    array_combine(array_column($array1, 0), $array2)
);

Output:

array (
  'data1' => 
  array (
    0 => '5',
    1 => '12',
    2 => '4',
  ),
  'data2' => 
  array (
    0 => '8',
    1 => '2',
    2 => '17',
  ),
  'data3' => 
  array (
    0 => '20',
    1 => '15',
    2 => '3',
  ),
)

answered Feb 22, 2021 at 7:39

mickmackusa♦

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Comments

Osama · Accepted Answer · 2017-05-14 01:33:30Z

-1

$array1 = array(
array('data1'),
array('data2'),
array('data3')
);
$array2 = array(
array('5','12','4'),
array('8','2','17'),
array('20','15','3')
);
$main_array=array(count($array1));
foreach($array as $array_item){
$array_item=array(count($array2));
for($i=1;$i<count($array2);$i++){
array.push($array_item,$array2[$i]);
}
array.push($main_array,$array_item);
}
echo "<br>";
print_r($main_array);
echo "</br>";

answered May 14, 2017 at 1:33

Osama

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