in array and multidimensional array

Question

I use in array   to check whether a value exists in an array like below    a   array  Mac    NT    Irix    Linux    if  in array  Irix    a          echo  Got Irix        print r  a     but what about an multidimensional array  below  - how can I check that value whether it exists in the multi-array    b   array array  Mac    NT    array  Irix    Linux      print r  b     or I shouldn t be using in array   when comes to the multidimensional array

User · Answer

you can use like this   result   array intersect  array1   array2   print r  result     http   php net manual tr function array-intersect php

User · Answer

I believe you can just use array key exists nowadays    lt  php  a array  Mac   gt  NT   Irix   gt  Linux    if  array key exists  Mac   a         echo  Key exists        else       echo  Key does not exist          gt

User · Answer

Here is my proposition based on json encode   solution with     case insensitive option returning the count instead of true anywhere in arrays  keys and values    If word not found  it still returns 0 equal to false   function in array count  needle   haystack   caseSensitive   true        if   caseSensitive            return substr count strtoupper json encode  haystack    strtoupper  needle              return substr count json encode  haystack    needle       Hope it helps

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Shorter version  for multidimensional arrays created based on database result sets   function in array r  array   field   find       foreach  array as  item           if  item  field      find  return true            return false      is found   in array r  os list   os version    XP      Will return if the  os list array contains  XP  in the os version field

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userdb   Array        0    gt  Array                         uid     gt   100                 name     gt   Sandra Shush                 url     gt   urlof100                   1    gt  Array                         uid     gt   5465                 name     gt   Stefanie Mcmohn                 url     gt   urlof5465                   2    gt  Array                         uid     gt   40489                 name     gt   Michael                 url     gt   urlof40489                 url in array   in array  urlof5465   array column  userdb   url      if  url in array        echo  value is in multidim array     else       echo  value is not in multidim array

User · Answer

The accepted solution  at the time of writing  by jwueller  function in array r  needle   haystack   strict   false        foreach   haystack as  item            if    strict    item      needle    item     needle      is array  item   amp  amp  in array r  needle   item   strict                  return true                       return false      Is perfectly correct but may have unintended behaviuor when doing weak comparison  the parameter  strict   false    Due to PHP s type juggling when comparing values of different type both   example     0   and  0     example    Evaluates true because  example  is casted to int and turned into 0    See Why does PHP consider 0 to be equal to a string    If this is not the desired behaviuor it can be convenient to cast numeric values to string before doing a non-strict comparison   function in array r  needle   haystack   strict   false        foreach   haystack as  item             if     strict  amp  amp  is string   needle    amp  amp    is float   item      is int   item                      item    string  item                     if    strict    item      needle    item     needle      is array  item   amp  amp  in array r  needle   item   strict                  return true                       return false

User · Answer

Since PHP 5 6 there is a better and cleaner solution for the original answer    With a multidimensional array like this     a   array array  Mac    NT    array  Irix    Linux      We can use the splat operator    return in array  Irix   array merge     a   true      If you have string keys like this     a   array  a    gt  array  Mac    NT     b    gt  array  Irix    Linux      You will have to use array values in order to avoid the error Cannot unpack array with string keys    return in array  Irix   array merge    array values  a    true

User · Answer

I found really small simple solution   If your array is    Array    details    gt  Array                name    gt  Dhruv          salary    gt  5000         score    gt  Array                ssc    gt  70          diploma    gt  90          degree    gt  70            then the code will be like    if in array  5000   array  details                   echo  yes found                    else                echo  no not found

User · Answer

Please try   in array  irix  array keys  b   in array  Linux  array keys  b  irix      Im not sure about the need  but this might work for your requirement

User · Answer

what about array search  seems it quite faster than foreach according to https   gist github com Ocramius 1290076     if  array search  Irix    a      true         echo  Got Irix

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You could always serialize your multi-dimensional array and do a strpos    arr   array array  Mac    NT    array  Irix    Linux       in arr    bool strpos serialize  arr   s 4  Irix       if  in arr       echo  Got Irix        Various docs for things I used    strpos   serialize   Type Juggling or  bool

User · Answer

This is the first function of this type that I found in the php manual for in array  Functions in the comment sections aren t always the best but if it doesn t do the trick you can look in there too      lt  php function in multiarray  elem   array                   if the  array is an array or is an object          if  is array   array      is object   array                                if  elem is in  array object              if  is object   array                                      temp array   get object vars   array                     if  in array   elem   temp array                          return TRUE                                  if  elem is in  array return true              if  is array   array    amp  amp  in array   elem   array                      return TRUE                    if  elem isn t in  array  then check foreach element              foreach   array as  array element                                      if  array element is an array or is an object call the in multiarray function to this element                     if in multiarray returns TRUE  than return is in array  else check next element                  if    is array   array element      is object   array element      amp  amp   this- gt in multiarray   elem   array element                                             return TRUE                       exit                                                            if isn t in array return FALSE          return FALSE          gt

User · Answer

if your array like this   array   array                array  name    gt   Robert    Age    gt   22    Place    gt   TN                   array  name    gt   Henry    Age    gt   21    Place    gt   TVL                 Use this  function in multiarray  elem   array  field         top   sizeof  array  - 1       bottom   0      while  bottom  lt    top                if  array  bottom   field      elem              return true          else              if is array  array  bottom   field                    if in multiarray  elem    array  bottom   field                         return true            bottom                      return false      example   echo in multiarray  22    array  Age

User · Answer

in array   does not work on multidimensional arrays  You could write a recursive function to do that for you   function in array r  needle   haystack   strict   false        foreach   haystack as  item            if    strict    item      needle    item     needle      is array  item   amp  amp  in array r  needle   item   strict                  return true                       return false      Usage    b   array array  Mac    NT    array  Irix    Linux     echo in array r  Irix    b     found     not found

User · Answer

This will work too   function in array r  item    array       return preg match      preg quote  item          i    json encode  array        Usage   if in array r  item    array           found

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For Multidimensional Children  in array  needle   array column  arr   key     For One Dimensional Children  in array  needle   call user func array  array merge    arr

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I used this method works for any number of nested and not require hacking   lt  php      blogCategories              programing    gt                 golang                php                ruby                functional    gt                     Erlang                    Haskell                                    bd    gt                 mysql                sqlite                        it   new RecursiveArrayIterator  blogCategories       foreach  new RecursiveIteratorIterator  it  as  t             found    t     Haskell           if   found               break

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I was looking for a function that would let me search for  both strings and arrays  as needle  in the array  haystack   so I added to the answer by  jwueller   Here s my code          Recursive in array function    Searches recursively for needle in an array  haystack      Works with both strings and arrays as needle     Both needle s and haystack s keys are ignored  only values are compared     Note  if needle is an array  all values in needle have to be found for it to    return true  If one value is not found  false is returned      param  mixed    needle   The array or string to be found     param  array    haystack The array to be searched in     param  boolean  strict   Use strict value  amp  type validation       or just value     return boolean           True if in array  false if not      function in array r  needle   haystack   strict   false            array wrapper     if  is array  needle             foreach   needle as  value                if  in array r  value   haystack   strict     false                       an array value was not found  stop search  return false                 return false                                     if the code reaches this point  all values in array have been found         return true                string handling     foreach   haystack as  item            if    strict    item      needle    item     needle                  is array  item   amp  amp  in array r  needle   item   strict                  return true                      return false

User · Answer

Great function  but it didnt work for me until i added the if  found    break    to the elseif  function in array r  needle   haystack         found   false      foreach   haystack as  item        if   item      needle                  found   true               break             elseif  is array  item                  found   in array r  needle   item                if  found                     break                                          return  found

User · Answer

This will do it   foreach  b as  value        if in array  Irix    value  true                 echo  Got Irix             in array only operates on a one dimensional array  so you need to loop over each sub array and run in array on each   As others have noted  this will only for for a 2-dimensional array   If you have more nested arrays  a recursive version would be better   See the other answers for examples of that

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It works too creating first a new unidimensional Array from the original one    arr   array  key1   gt  value1   key2   gt  value2   key3   gt  value3     foreach   arr as  row    vector      row  key1     in array  needle  vector

User · Answer

If you know which column to search against  you can use array search   and array column      userdb   Array        0    gt  Array                         uid     gt   100                 name     gt   Sandra Shush                 url     gt   urlof100                   1    gt  Array                         uid     gt   5465                 name     gt   Stefanie Mcmohn                 url     gt   urlof5465                   2    gt  Array                         uid     gt   40489                 name     gt   Michael                 url     gt   urlof40489                if array search  urlof5465   array column  userdb   url        false        echo  value is in multidim array     else       echo  value is not in multidim array       This idea is in the comments section for array search   on the PHP manual

[php] in_array() and multidimensional array

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