Create an array from 2 other arrays

Question

$arrayA = Array ( 
                 [0] => 1, 
                 [1] => 2, 
                 [2] => 4 
                )

$arrayB = Array ( 
                 [1] => Dog, 
                 [2] => Cat, 
                 [3] => Cow, 
                 [4] => Duck 
                )

How do I create an $arrayC that takes the value from the above 2 arrays:

$arrayC = Array ( 
                 [1] => Dog, 
                 [2] => Cat, 
                 [4] => Duck 
                )

Theoretically, it's something like this:

$arrayC = Array ( 
                 [$arrayA[0]] => $arrayB[$arrayA[0]],
                 [$arrayA[1]] => $arrayB[$arrayA[1]],
                 [$arrayA[2]] => $arrayB[$arrayA[2]]
                )

Thanks.

hakre · Accepted Answer · 2011-07-28 10:03:58Z

7

You can do this in elegant way without foreach (Demo):

$arrayC = array_intersect_key($arrayB, array_flip($arrayA));

See array_intersect_key^[Docs] and array_flip^[Docs]

edited Jul 28, 2011 at 10:03

hakre

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answered Jul 28, 2011 at 9:44

Stanislav Shabalin

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2 Comments

Ariel Over a year ago

Very nice! Even better than mine.

hakre Over a year ago

+1: Would suggest this solution as well, added a demo and some links.

Yoshi · Accepted Answer · 2011-07-28 09:33:16Z

2

$arrayC = array();
foreach ($arrayA as $key) {
  if (isset($arrayB[$key])) {
     $arrayC[$key] = $arrayB[$key];
  }
}

answered Jul 28, 2011 at 9:33

Yoshi

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Comments

Ariel · Accepted Answer · 2011-07-28 09:44:53Z

1

No need to write the foreach loop yourself:

//get only the keys that are in both
$arrayA = array_intersect_key(array_fill_keys($arrayA , true), $arrayB);
$arrayB = array_intersect_key($arrayB, $arrayA);

//combine the arrays
$arrayC = array_combine(array_keys($arrayA), $arrayB);

edited Jul 28, 2011 at 9:44

answered Jul 28, 2011 at 9:39

Ariel

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Comments

Caner · Accepted Answer · 2011-07-28 09:52:22Z

1

foreach($arrayA as $i => $key) {
    $arrayC[$key] = $arrayB[$arrayA[$i]];
}

$arrayC will be:

Array ( [1] => Dog [2] => Cat [4] => Duck )

edited Jul 28, 2011 at 9:52

answered Jul 28, 2011 at 9:42

Caner

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Comments

Nanthini Muniapan · Accepted Answer · 2011-07-28 09:34:55Z

0

You can try to do something like this :-

foreach ($arrayA as $number)
{
  if(isset($arrayB[$number])
  {
    $arrayC[$number] = $arrayB[$number];
  }
}

answered Jul 28, 2011 at 9:34

Nanthini Muniapan

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