Merging two PHP arrays with same numeric key

问题

Having some difficulty trying to merge two arrays with the same numeric key. I have tried array_merge() and array_merge_recursive(), but all that seems to do is append the second array.

The first array has the following form:

Array
(
    [384] => Array
        (
            [name] => SomeMovieName1
            [age] => 12.2 hrs
            [IMDBLink] => 
            [IMDBRating] => 
            [coverArt] => 
        )

    [452] => Array
        (
            [name] => SomeMovieName2
            [age] => 13.1 hrs
            [IMDBLink] => 
            [IMDBRating] => 
            [coverArt] => 
        )

    [945] => Array
        (
            [name] => SomeMovieName3
            [age] => 13.6 hrs
            [IMDBLink] => 
            [IMDBRating] => 
            [coverArt] => 
        )
)

And here is the second array I want to combine/merge with the first:

Array
(
    [384] => Array
        (
            [IMDBRating] => 7.2
            [IMDBLink] => http://www.imdb.com/LinkToMovie1
            [coverArt] => http://www.SomeLinkToCoverArt.com/1
        )

    [452] => Array
        (
            [IMDBRating] => 8.2
            [IMDBLink] => http://www.imdb.com/LinkToMovie2
            [coverArt] => http://www.SomeLinkToCoverArt.com/2
        )

    [945] => Array
        (
            [IMDBRating] => 6.2
            [IMDBLink] => http://www.imdb.com/LinkToMovie3
            [coverArt] => http://www.SomeLinkToCoverArt.com/3
        )
)

And after merging, I would like the result to be:

Array
(
    [0] => Array
        (
            [name] => SomeMovieName1
            [age] => 12.2 hrs
            [IMDBRating] => 7.2
            [IMDBLink] => http://www.imdb.com/LinkToMovie1
            [coverArt] => http://www.SomeLinkToCoverArt.com/1
        )

    [1] => Array
        (
            [name] => SomeMovieName2
            [age] => 13.1 hrs
            [IMDBRating] => 8.2
            [IMDBLink] => http://www.imdb.com/LinkToMovie2
            [coverArt] => http://www.SomeLinkToCoverArt.com/2
        )

    [2] => Array
        (
            [name] => SomeMovieName3
            [age] => 13.6 hrs
            [IMDBRating] => 6.2
            [IMDBLink] => http://www.imdb.com/LinkToMovie3
            [coverArt] => http://www.SomeLinkToCoverArt.com/3
        )
)

Not sure if it's because of the inner arrays causing an issue that it won't work directly with array_merge() or array_merge_recursive(). Any help would be appreciated,

Thanks.

回答1:

You can try below code to merge array. Code generates desired output required to you. I have used sample array as given by you:

<?php
    $arr1=array(
        "384"=>array("name"=>"SomeMovieName1","age"=>"12.2 hrs","IMDBLink"=>"","IMDBRating"=>"", "coverArt"=>""),
        "452"=>array("name"=>"SomeMovieName2","age"=>"15.2 hrs","IMDBLink"=>"","IMDBRating"=>"", "coverArt"=>""),
        "954"=>array("name"=>"SomeMovieName3","age"=>"4.2 hrs","IMDBLink"=>"","IMDBRating"=>"", "coverArt"=>"")
    );
    $arr2=array(
       "384" => array("IMDBLink" => "7.2", "IMDBRating" => "http://www.imdb.com/LinkToMovie1", "coverArt" => "http://www.SomeLinkToCoverArt.com/1"),
       "452" => array("IMDBLink" => "5","IMDBRating" => "http://www.imdb.com/LinkToMovie2", "coverArt" => "http://www.SomeLinkToCoverArt.com/2"),
       "954"=>array("IMDBLink" => "8","IMDBRating" => "http://www.imdb.com/LinkToMovie3", "coverArt" => "http://www.SomeLinkToCoverArt.com/3")
    );
    $arr3 = array();
    foreach($arr1 as $key=>$val)
    {
         $arr3[] = array_merge($val, $arr2[$key]);
    }
    echo "<pre>";
    print_r($arr3);
?>

回答2:

It might be easier to run your arrays in a foreach loop and just insert each value into your initial array. Lets call the first array $myFirstArray and the second array $mySecondArray:

foreach ($myFirstArray as $key => $value)
{
  $myFirstArray[$key][IMDBRating] = $mySecondArray[$key][IMDBRating];
  $myFirstArray[$key][IMDBLink] = $mySecondArray[$key][IMDBLink];
  $myFirstArray[$key][coverArt] = $mySecondArray[$key][coverArt];
}

回答3:

Didn't test this, but it should work:

Call your first array $ar1, and second $ar2

$result=array();
foreach($ar1 as $k=>$v)
{
 //if there is a corresponding array2 element
 if( isset($ar2[$k]) ){ 
       $result[] = array( $v['name], $v['age'], $ar2[$k]['IMDBLink'], $ar2[$k]['IMDBRating'],$ar2['coverArt']);
 }
}

//result
print_r($result);

回答4:

array_merge_recursive doesn't work because your outer array has numeric keys, not string keys. When array_merge or array_merge_recursive are given numeric arrays, they append them rather than merging elements with the same keys.

Instead, you can map through the arrays and merge the corresponding elements.

$result = array_map('array_merge', $array1, $array2);

Note that this code assumes that the two input arrays have all the same keys in the same order. If they're not in the same order, you can use ksort on them first to rearrange them.

If they can have different keys, though, you need a different solution, like the loop in Webang's answer.

来源：https://stackoverflow.com/questions/36807532/merging-two-php-arrays-with-same-numeric-key