Replace an array's values with the values from a lookup array

Question

I have two arrays. The one's array key is another's value. Here is code:

$arr1 = array(
    'a' => 'apple',
    'b' => 'banana',
    'c' => 'pear',
);

$arr2 = array(
    'bird' => 'a',
    'dog' => 'b',
);

And my question, how to combine two arrays in one like:

$arr3 = array(
    'bird' => 'apple',
    'dog' => 'banana',
);

Is there have some array function to do this probably?

just loop the $arr2 values into the keys of $arr1 using foreach, $arr1[$value_from_$arr2] no need for special functions — Kevin
– Kevin, Commented Oct 27, 2015 at 2:48

Chris · Accepted Answer · 2015-10-27 04:03:14Z

1

<?php
$arr3 = array();

foreach ($arr2 as $item => $value) {
  $arr3[$item] = $arr1[$value];
}
print_r($arr3);

something along those lines anyway.

If you literally want to merge the arrays, array_merge will do the job fine.

Chris

4,8304 gold badges48 silver badges82 bronze badges

answered Oct 27, 2015 at 2:49

Mark Eriksson

1,47510 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

AbraCadaver · Accepted Answer · 2015-10-27 20:33:49Z

1

Edit: This is a fun way and matches the keys:

$arr3 = array_combine(array_intersect_key($k = array_flip($arr2), $arr1),
                      array_intersect_key($arr1, $k));

Original with no key matching:

Here's a way. Doesn't matter which array is longer:

$arr3 = array_combine(array_slice(array_keys($arr2), 0, count($arr1)),
                      array_slice($arr1, 0, count($arr2)));

answered Oct 27, 2015 at 2:59

AbraCadaver

79.2k7 gold badges75 silver badges91 bronze badges