PHP - merge two arrays similar to array_combine, but with duplicate keys

Question

I have two arrays:

$arrKeys = array('str', 'str', 'otherStr');
$arrVals = array('1.22', '1.99', '5.17');

I would like to merge them into something like this

$arrResult = array(
    array('str' => 1.22),
    array('str' => 1.99),
    array('otherStr' => 5.17)
);

The keys are non-unique, otherwise I'd use array_combine. That would give a bit different output, but it would suit me as well.

Can this be done in an elegant way using PHP 5.2.x, without foreach/for loops, preferably using PHP's built-in functions?

@chelmertz - yes, that is why I'm not using array_combine and the result I would like to obtain is a bit different, as in my example — bububaba
– bububaba, Commented Jan 31, 2012 at 11:36

dorsh · Accepted Answer · 2012-01-31 11:40:09Z

16

You can use array_map:

$arrKeys = array('str', 'str', 'otherStr');
$arrVals = array('1.22', '1.99', '5.17');
function foo($key, $val) {
   return array($key=>$val);
}

$arrResult = array_map('foo', $arrKeys, $arrVals);

print_r($arrResult);
Array
(
    [0] => Array
        (
            [str] => 1.22
        )

    [1] => Array
        (
            [str] => 1.99
        )

    [2] => Array
        (
            [otherStr] => 5.17
        )

)

BTW, if you upgrade to PHP 5.3 you can do this using an anonymous function, which is a bit more elegant:

array_map(function($key, $val) {return array($key=>$val);}, $arrKeys, $arrVals);

edited Jan 31, 2012 at 11:40

answered Jan 31, 2012 at 11:33

dorsh

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1 Comment

dorsh Over a year ago

I wonder why would someone down-vote this after it was accepted without adding a comment

Your Common Sense · Accepted Answer · 2012-01-31 11:51:42Z

10

There is absolutely nothing "elegant" in using PHP's built-in functions and nothing to pursue for.

This is not a Haute Couture show. This is programming.
As long as you have a solution that is sane, readable and works, you can call it elegant.

Simple foreach will do the job. You'd do yourself huge favor and save a lot of time if start using working solutions instead of looking for "elegant" ones.

$result = array();
foreach ($arrKeys as $i => $key) {
  $result[] = array($key => $arrVals[$i]);
}

edited Jan 31, 2012 at 11:51

answered Jan 31, 2012 at 11:42

Your Common Sense

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6 Comments

dorsh Over a year ago

Isn't array_map simple and elegant?

Your Common Sense Over a year ago

no. obfuscating your own code has nothing in common with elegance

Wrikken Over a year ago

I have no problems reading array_map, but indeed here I think just a simple loop is a helluvalot clearer for the next guy....

bot Over a year ago

like the way you do it dude.. :)

a20 Over a year ago

lol. PHP's built in functions are optimized and compiled in C -- i.e much faster than the hackey crap you will write with your "sane, readable, elegant" PHP code. Use the optimized low level code as much as possible.

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Dave Child · Accepted Answer · 2012-01-31 11:38:16Z

2

Assuming you want item 0 in $arrKeys and item 0 in $arrVals to be added to one array, and that array to be an item in $arrResult, and so on, the easiest way would probably be a simple loop:

$arrResult = array();
for ($i = 0, $max = count($arrKeys); $i < $max; $i++) {
    $arrResult[] = array($arrKeys[$i], $arrValues[$i]);
}

answered Jan 31, 2012 at 11:38

Dave Child

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