How to sort array keys by other array keys?

Question

For example i have two arrays like:

$first_array = array(
    1 => 'a',
    2 => 'b',
    3 => 'c',
    4 => 'd',
    5 => 'e'
);

$second_array = array(
    1 => 'not important',
    4 => 'not important',
    3 => 'not important',
    5 => 'not important',
    2 => 'not important',
);

Is there any function that could arrange first array keys (with values) in sequence of second array keys? Or i just need to loop second array and recreate first by keys?

Update: Result values should be arranged by seconds arrays keys sequence

$result = array(
    1 => 'a',
    2 => 'd',
    3 => 'c',
    4 => 'e',
    5 => 'b'
);

contrary to popular belief php doesn't have a function/method for everything. — gwillie, Dec 04 '13 at 11:51
@RishabhRaj Result values should be arranged by seconds arrays keys sequence — Kin, Dec 04 '13 at 11:59
@Kirix, Do you wan't to preserve the keys in the second array ? — Shankar Narayana Damodaran, Dec 04 '13 at 12:09
[array_keys](http://php.net/manual/de/function.array-keys.php), [array_multisort](http://php.net/manual/de/function.array-multisort.php) — Michael Kunst, Dec 04 '13 at 12:11
@Kirix, Which is source array and destination? We dont have such function upto my PHP knowledge. But we can build a new function for this.... — Kumar V, Dec 04 '13 at 12:19

score 0 · Answer 1 · edited May 23 '17 at 10:25

0

same question is already posted

Sort array by keys of another array

Sort an Array by keys based on another Array?

Hope will help!

edited May 23 '17 at 10:25

Community

1
1

answered Dec 04 '13 at 12:19

Rajiv Ranjan

1,869
1
11
20

score 0 · Answer 2 · answered Dec 04 '13 at 12:46

You can do something like this...

<?php
$first_array = array(
    1 => 'a',
    2 => 'b',
    3 => 'c',
    4 => 'd',
    5 => 'e'
);

$second_array = array(
    1 => 'not important',
    4 => 'not important',
    3 => 'not important',
    5 => 'not important',
    2 => 'not important',
);


foreach($first_array as $k=>$v)
{
$second_array[$k]=$v;
}

$result = array_values($second_array);
array_unshift($result, "dummy");
unset($result[0]);
print_r($result);

OUTPUT:

Array
(
    [1] => a
    [2] => d
    [3] => c
    [4] => e
    [5] => b
)

Nambi · Answer 3 · 2013-12-05T01:20:22.813

0

you can do it by using single foreach() loop and array_flip(); and array_combine();

     $f = array(
    1 => 'a',
    2 => 'b',
    3 => 'c',
    4 => 'd',
    5 => 'e'
);
$s = array(
    1 => 'dummy',
    4 => 'dummy',
    3 => 'dummy',
    5 => 'dummy',
    2 => 'dummy',
);
$c=array();
$j=1;
foreach($s as $k=>$v){

$c[]=$f[$k];

}
$f=array_flip($f);
$c=array_combine($f,$c);

print_r($c);

edited Dec 05 '13 at 01:20

answered Dec 05 '13 at 01:13

Nambi

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3
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How to sort array keys by other array keys?

3 Answers3