Merging arrays with the same keys

Question

In a piece of software  I merge two arrays with array merge function  But I need to add the same array  with the same keys  of course  to an existing array   The problem     A   array  a    gt  1   b    gt  2   c    gt  3     B   array  c    gt  4   d   gt  5     array merge  A   B        result   a    gt  1  b    gt  2  c    gt  4  d    gt  5   As you see   c    gt  3 is missed    So how can I merge all of them with the same keys

User · Accepted Answer

You need to use array merge recursive instead of array merge  Of course there can only be one key equal to  c  in the array  but the associated value will be an array containing both 3 and 4

User · Answer

Two entries in an array can t share a key  you ll need to change the key for the duplicate

User · Answer

I just wrote this function  it should do the trick for you  but it does left join   public function mergePerKey  array1  array2                 mergedArray                foreach   array1 as  key   gt   value                         if isset  array2  key                                   mergedArray  value    null                  continue                              mergedArray  value     array2  key                      return  mergedArray

User · Answer

arr1   array      0    gt  array  fid    gt  1   tid    gt  1   name    gt   Melon        1    gt  array  fid    gt  1   tid    gt  4   name    gt   Tansuozhe        2    gt  array  fid    gt  1   tid    gt  6   name    gt   Chao        3    gt  array  fid    gt  1   tid    gt  7   name    gt   Xi        4    gt  array  fid    gt  2   tid    gt  9   name    gt   Xigua        if you want to convert this array as following    arr2   array      0    gt  array             0    gt  array  fid    gt  1   tid    gt  1   name    gt   Melon               1    gt  array  fid    gt  1   tid    gt  4   name    gt   Tansuozhe               2    gt  array  fid    gt  1   tid    gt  6   name    gt   Chao               3    gt  array  fid    gt  1   tid    gt  7   name    gt   Xi                1    gt  array             0    gt array  fid    gt  2   tid    gt  9   name    gt   Xigua               so  my answer will be like this    outer array   array     unique array   array    foreach  arr1 as  key   gt   value         inner array   array          fid value    value  fid        if  in array  value  fid     unique array                     array push  unique array   fid value               unset  value  fid                 array push  inner array   value                outer array  fid value     inner array         else              unset  value  fid                 array push  outer array  fid value    value            var dump array values  outer array      hope this answer will help somebody sometime

User · Answer

A   array  a    gt  1   b    gt  2   c    gt  3     B   array  c    gt  4   d   gt  5     C   array merge recursive  A   B     aWhere   array     foreach   C as  k  gt  v         if  is array  v              aWhere      k     in    implode       v                 else            aWhere      k            v             where   implode   AND     aWhere    echo  where

User · Answer

Try with array merge recursive   A   array  a    gt  1   b    gt  2   c    gt  3    B   array  c    gt  4   d   gt  5    c   array merge recursive  A  B    echo   lt pre gt    print r  c   echo   lt  pre gt      will return  Array        a    gt  1      b    gt  2      c    gt  Array                        0    gt  3              1    gt  4                 d    gt  5

User · Answer

Try this   array one     ratio type     array two     ratio type    ratio type     array three     ratio type     array four     ratio type     array five     ratio type    ratio type    ratio type     array six     ratio type     array seven     ratio type     array eight     ratio type      all array elements   array merge recursive       array one       array two       array three       array four       array five       array six       array seven       array eight     foreach   all array elements as  key   gt   value        echo  quot   key  quot      -      value   PHP EOL        OR var dump  all array elements

[php] Merging arrays with the same keys

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