PHP combine two associative arrays into one array

Question

array1   array   name1    gt    id1      array2   array   name2    gt    id2     name3    gt    id3      I need a new array combining all together  i e  it would be   array3   array   name1    gt    id1     name2    gt    id2     name3    gt    id3      What is the best way to do this   Sorry  I forgot  the ids will never match each other  but technically the names could  yet would not be likely  and they all need to be listed in one array   I looked at array merge but wasn t sure if that was best way to do this   Also  how would you unit test this

User · Answer

array   array              22   gt  true              25   gt  true              34   gt  true              35   gt  true                      print r              array replace  array                    22   gt  true                  42   gt  true                                     print r              array merge  array                    22   gt  true                  42   gt  true                              If it is numeric but not sequential associative array  you need to use array replace

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There is also array replace  where an original array is modified by other arrays preserving the key    value association without creating duplicate keys    Same keys on other arrays will cause values to overwrite the original array New keys on other arrays will be created on the original array

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I stumbled upon this question trying to identify a clean way to join two assoc arrays    I was trying to join two different tables that didn t have relationships to each other   This is what I came up with for PDO Query joining two Tables  Samuel Cook is what identified a solution for me with the array merge    1 to him            pdo- gt setAttribute PDO  ATTR ERRMODE  PDO  ERRMODE EXCEPTION            sql    SELECT   FROM   databaseTbl Residential Prospects              ResidentialData    pdo- gt prepare  sql            ResidentialData- gt execute array  lapi             ResidentialProspects    ResidentialData- gt fetchAll PDO  FETCH ASSOC             pdo- gt setAttribute PDO  ATTR ERRMODE  PDO  ERRMODE EXCEPTION            sql    SELECT   FROM   databaseTbl Commercial Prospects              CommercialData    pdo- gt prepare  sql            CommercialData- gt execute array  lapi             CommercialProspects    CommercialData- gt fetchAll PDO  FETCH ASSOC             Prospects   array merge  ResidentialProspects  CommercialProspects           echo   lt pre gt            var dump  Prospects           echo   lt  pre gt      Maybe this will help someone else out

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Check out array merge      array3   array merge  array1   array2

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UPDATE Just a quick note  as I can see this looks really stupid  and it has no good use with pure PHP because the array merge just works there  BUT try it with the PHP MongoDB driver before you rush to downvote  That dude WILL add indexes for whatever reason  and WILL ruin the merged object  With my na  ve little function  the merge comes out exactly the way it was supposed to with a traditional array merge      I know it s an old question but I d like to add one more case I had recently with MongoDB driver queries and none of array merge  array replace nor array push worked  I had a bit complex structure of objects wrapped as arrays in array    a        a    gt   1   a2        b    gt    b1   2       t        c    gt    c1    c2        b    gt    b1   2        And I needed to merge them keeping the same structure like this    merged        a    gt   1   a2        b    gt    b1   2       c    gt    c1    c2        b    gt    b1   2        The best solution I came up with was this   public static function glueArrays  arr1   arr2           merges TWO  2  arrays without adding indexing        myArr    arr1      foreach   arr2 as  arrayItem             myArr      arrayItem            return  myArr

User · Answer

array merge   is more efficient but there are a couple of options    array1   array  id1    gt   value1      array2   array  id2    gt   value2    id3    gt   value3    id4    gt   value4      array3   array merge  array1   array2     arrayN   arrayN      array4    array1    array2   echo   lt pre gt    var dump  array3   var dump  array4   echo   lt  pre gt         Results      array 4            id1    gt        string 6   value1          id2    gt        string 6   value2          id3    gt        string 6   value3          id4    gt        string 6   value4            array 4            id1    gt        string 6   value1          id2    gt        string 6   value2          id3    gt        string 6   value3          id4    gt        string 6   value4

User · Answer

I use a wrapper around array merge to deal with SeanWM s comment about null arrays  I also sometimes want to get rid of duplicates  I m also generally wanting to merge one array into another  as opposed to creating a new array  This ends up as          Merge two arrays - but if one is blank or not an array  return the other      param  a array First array  into which the second array will be merged     param  b array Second array  with the data to be merged     param  unique boolean If true  remove duplicate values before returning     function arrayMerge  amp  a   b   unique   false        if  empty  b             return      No changes to be made to  a           if  empty  a              a    b          return             a   array merge  a   b       if   unique             a   array unique  a

[php] PHP combine two associative arrays into one array

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