Convert multidimensional array into single array

Question

I have an array which is multidimensional for no reason     This is how my array is currently    Array    0    gt  Array                0    gt  Array                                plan    gt  basic                         1    gt  Array                                plan    gt  small                         2    gt  Array                                plan    gt  novice                         3    gt  Array                                plan    gt  professional                         4    gt  Array                                plan    gt  master                         5    gt  Array                                plan    gt  promo                         6    gt  Array                                plan    gt  newplan                            I want to convert this array into this form    Now  I want to simply it down to this   Array    0    gt  basic  1    gt  small  2    gt  novice  3    gt  professional  4    gt  master  5    gt  promo  6    gt  newplan     Any idea how to do this

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Problem array  array 2      0   gt  array 3        0   gt  array 4           quot id quot    gt  8        quot name quot    gt   quot Veggie Burger quot         quot image quot    gt   quot  quot         quot Category type quot    gt   quot product quot            1   gt  array 4           quot id quot    gt  9        quot name quot    gt   quot Veggie Pitta quot         quot image quot    gt   quot  quot         quot Category type quot    gt   quot product quot            2   gt  array 4           quot id quot    gt  10        quot name quot    gt   quot Veggie Wrap quot         quot image quot    gt   quot  quot         quot Category type quot    gt   quot product quot              1   gt  array 2        0   gt  array 4           quot id quot    gt  18        quot name quot    gt   quot Cans 330ml quot         quot image quot    gt   quot  quot         quot Category type quot    gt   quot product quot            1   gt  array 4           quot id quot    gt  19        quot name quot    gt   quot Bottles 1 5 Ltr quot         quot image quot    gt   quot  quot         quot Category type quot    gt   quot product quot               Solution array  array 5      0   gt  array 4         quot id quot    gt  8      quot name quot    gt   quot Veggie Burger quot       quot image quot    gt   quot  quot       quot Category type quot    gt   quot product quot        1   gt  array 4         quot id quot    gt  9      quot name quot    gt   quot Veggie Pitta quot       quot image quot    gt   quot  quot       quot Category type quot    gt   quot product quot        2   gt  array 4         quot id quot    gt  10      quot name quot    gt   quot Veggie Wrap quot       quot image quot    gt   quot  quot       quot Category type quot    gt   quot product quot        3   gt  array 4         quot id quot    gt  18      quot name quot    gt   quot Cans 330ml quot       quot image quot    gt   quot  quot       quot Category type quot    gt   quot product quot        4   gt  array 4         quot id quot    gt  19      quot name quot    gt   quot Bottles 1 5 Ltr quot       quot image quot    gt   quot  quot       quot Category type quot    gt   quot product quot         Write this code and get your solution    subcate is your multi dimensional array   singleArrayForCategory   array reduce  subcate   array merge   array

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none of answers helped me  in case when I had several levels of nested arrays  the solution is almost same as  AlienWebguy already did  but with tiny difference   function nestedToSingle array  array         singleDimArray            foreach   array as  item             if  is array  item                  singleDimArray   array merge  singleDimArray  nestedToSingle  item               else                singleDimArray      item                       return  singleDimArray      test example   array              first            second                          third                fourth                       fifth                          sixth                                  seventh                    eighth                                          ninth                                                                                tenth                                                                                      eleventh                                    twelfth               array   nestedToSingle  array       print r  array          output     array 12           0   gt   first          1   gt   second          2   gt   third          3   gt   fourth          4   gt   fifth          5   gt   sixth          6   gt   seventh          7   gt   eighth          8   gt   ninth          9   gt   tenth          10   gt   eleventh          11   gt   twelfth

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This single line would do that    array   array column  array   plan      The first argument is an array   The second argument is an array key   For details  go to official documentation  https   www php net manual en function array-column php

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Assuming this array may or may not be redundantly nested and you re unsure of how deep it goes  this should flatten it for you   function array flatten  array       if   is array  array          return FALSE           result   array       foreach   array as  key   gt   value         if  is array  value             result   array merge  result  array flatten  value                else           result  key     value                 return  result

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Following this pattern   input   array 10  20  array 30  40   array  key1    gt   50    key2   gt array 60   70      Call the function    echo   lt pre gt   print r flatten array  input   output null      Function Declaration     function flatten array  input   output null    if  input    null  return null  if  output    null   output   array    foreach  input as  value        if is array  value              output   flatten array  value   output         else           array push  output   value           return  output

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Despite that array column will work nice here  in case you need to flatten any array no matter of it s internal structure you can use this array library to achieve it without ease    flattened   Arr  flatten  array     which will produce exactly the array you want

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Recently I ve been using AlienWebguy s array flatten function but it gave me a problem that was very hard to find the cause of  array merge causes problems  and this isn t the first time that I ve made problems with it either  If you have the same array keys in one inner array that you do in another  then the later values will overwrite the previous ones in the merged array    Here s a different version of array flatten without using array merge   function array flatten  array       if   is array  array          return FALSE           result   array       foreach   array as  key   gt   value         if  is array  value             arrayList array flatten  value         foreach   arrayList as  listItem             result      listItem                     else         result  key     value                return  result

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Just assign it to it s own first element    array    array 0

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singleArray   array         foreach   multiDimensionalArray as  key   gt   value            singleArray  key     value  plan            this is best way to create a array from multiDimensionalArray  array   thanks

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This simple code you can use  array   array column  array   value    key

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Try this it works for me        newArray   array                foreach  operator call logs as  array                    foreach  array as  k  gt  v                         newArray  k     v

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For this particular case  this ll do    array   array map  current    array 0      It s basically the exact same question is this one  look at some answers there  PHP array merge from unknown number of parameters

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I ve written a complement to the accepted answer  In case someone  like myself need a prefixed version of the keys  this can be helpful   Array        root    gt  Array                        url    gt  http   localhost misc markia                Array        root url    gt  http   localhost misc markia      lt  php function flattenOptions  array   old           if   is array  array         return FALSE         result   array      foreach   array as  key   gt   value        if  is array  value            result   array merge  result  flattenOptions  value   key              else          result  old          key     value              return  result

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You can do it just using a loop        singleArray   array         foreach   multiDimensionalArray as  key   gt   value            singleArray  key     value  plan

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Save this as a php file  simply import and use single array   function   lt  php  GLOBALS  single array       function array conveter  array list       if is array  array list            foreach  array list as  array ele               if is array  array ele                    array conveter  array ele                else                  array push  GLOBALS  single array    array ele                                else          array push  GLOBALS  single array    array list           function single array  mix       foreach  mix as  single           array conveter  single        return  GLOBALS  single array         GLOBALS  single array            Example convert your multi array to single      mix array  3 4 5  4 6 6 7   abc    print r single array  mix array       gt

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If you come across a multidimensional array that is pure data  like this one below  then you can use a single call to array merge   to do the job via reflection     arrayMult       a   b       c    d       arraySingle   call user func array  array merge    arrayMult       arraySingle is now     a   b    c    d

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I have done this with OOP style   res  1  gt  2 3 7 8 19  3  gt  4 12  2  gt  5 9  5  gt 6 7  gt  10 13  10  gt  11 18  8  gt  14 20  12  gt 15 6  gt  16 17    class MultiToSingle  public  result     public function   construct  array       if  is array  array            echo  Give a array             foreach  array as  key   gt   value           if is array  value                for  i 0  i lt count  value   i                      this- gt result    value  i                            else               this- gt result    value                        obj  new MultiToSingle  res    array  obj- gt result  print r  array

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Your sample array has 3 levels  Because the first level has only  0   you can hardcode your access into it and avoid an extra function construct call    Code Demos    array walk recursive   is handy and versatile  but for this task may be overkill and certainly a bit more convoluted in terms of readability   array walk recursive  array  function  leafvalue use  amp  flat   flat      leafvalue     var export  flat    If this was my code  I d be using array column   because it is direct and speaks literally about the action being performed   var export array column  array 0    plan      Of course a couple of  foreach   loops will perform very efficiently because language constructs generally perform more efficiently than function calls   foreach   array 0  as  plans        foreach   plans as  value             flat      value          var export  flat    Finally  as a funky alternative  which I can t imagine actually putting to use unless I was writing code for someone whom I didn t care for  I ll offer an array merge recursive   call with a splat operator         var export array merge recursive     array 0    plan

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Multi dimensional array to single array with one line code     Enjoy the code      array  1  gt  2 5  gt  4 2   7 8  gt  3 6   5  4    arr     array walk recursive  array  function  k  global  arr   arr    k     print r  arr        Enjoy the code

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I had come across the same requirement to flatter multidimensional array into single dimensional array than search value using text in key  here is my code   data           json data                   downtime   true               pfix                      max   100                   threshold   880                             ints                      int                           rle    pri                        device    laptop                        int    Ether3                        ip    127 0 0 3                                       eth                          lan   57                                                                   downtime   false               lsi    987654                pfix                      min   10000                   threshold   890                             mana                      mode    NONE                              ints                      int                           rle    sre                        device    desk                        int    Ten                        ip    1 1 1 1                        UF   true                                      ethernet                          lan   2                                                        data   json decode  data true      stack    amp  data   separator         toc   array     while   stack        list  key   value    each  stack       unset  stack  key        if  is array  value              build   array  key   gt         numbering without a title          foreach   value as  subKey   gt   node               build  key    separator    subKey     node           stack    build    stack          continue            if  is numeric  key             toc  key     value            echo   lt pre  gt    print r  toc       My output   Array        json data    gt        json data 0    gt        json data 0 downtime    gt  1      json data 0 pfix    gt        json data 0 pfix max    gt  100      json data 0 pfix threshold    gt  880      json data 0 ints    gt        json data 0 ints int    gt        json data 0 ints int 0    gt        json data 0 ints int 0 rle    gt  pri      json data 0 ints int 0 device    gt  laptop      json data 0 ints int 0 int    gt  Ether3      json data 0 ints int 0 ip    gt  127 0 0 3      json data 0 ints eth    gt        json data 0 ints eth lan    gt  57      json data 1    gt        json data 1 downtime    gt        json data 1 lsi    gt  987654      json data 1 pfix    gt        json data 1 pfix min    gt  10000      json data 1 pfix threshold    gt  890      json data 1 mana    gt        json data 1 mana mode    gt  NONE      json data 1 ints    gt        json data 1 ints int    gt        json data 1 ints int 0    gt        json data 1 ints int 0 rle    gt  sre      json data 1 ints int 0 device    gt  desk      json data 1 ints int 0 int    gt  Ten      json data 1 ints int 0 ip    gt  1 1 1 1      json data 1 ints int 0 UF    gt  1      json data 1 ints ethernet    gt        json data 1 ints ethernet lan    gt  2

[php] Convert multidimensional array into single array

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