PHP Multidimensional Array Searching Find key by specific value

Question

I have this multidimensional array  I need to search it and return only the key that matches the value of the  slug   I know there are other threads about searching multidimensional arrays  but I m not really understanding enough to apply to my situation  Thanks very much for any help   So I need a function like   myfunction  products  breville-one-touch-tea-maker-BTM800XL       returns 1   Here s the Array    products   array   1    gt  array           name             gt   The Breville One-Touch Tea Maker            slug             gt   breville-one-touch-tea-maker-BTM800XL            shortname        gt   The One-Touch Tea Maker            listprice        gt   299 99            price            gt   249 99            rating           gt   9 5            reviews          gt   81            buyurl           gt   http   www amazon com The-Breville-One-Touch-Tea-Maker dp B003LNOPSG            videoref1        gt   xNb-FOTJY1c            videoref2        gt   WAyk-O2B6F8            image            gt   812BpgHhjBML jpg            related1         gt   2            related2         gt   3            related3         gt   4            bestbuy          gt   1            quote            gt               quoteautor       gt   K  Martino               2    gt  array           name             gt   Breville Variable-Temperature Kettle BKE820XL            slug             gt   breville-variable-temperature-kettle-BKE820XL            shortname        gt   Variable Temperature Kettle            listprice        gt   199 99            price            gt   129 99            rating           gt   9            reviews          gt   78            buyurl           gt   http   www amazon com Breville-BKE820XL-Variable-Temperature-1-8-Liter-Kettle dp B001DYERBK            videoref1        gt   oyZWBD83xeE            image            gt   41y2B8jSKmwL jpg            related1         gt   3            related2         gt   4            related3         gt   5            bestbuy          gt   1            quote            gt               quoteautor       gt

User · Answer

Try this  function recursive array search  needle  haystack            foreach  haystack as  key  gt  value                 current key  key              if  needle   value  uid   OR  is array  value   amp  amp  recursive array search  needle  value      false                     return  current key                                  return false

User · Answer

Another poossible solution is based on the array search   function  You need to use PHP 5 5 0 or higher    Example   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            pic square    gt   urlof100           2    gt  Array                uid    gt   40489            name    gt   Michael            pic square    gt   urlof40489             key   array search 40489  array column  userdb   uid      echo   The key is     key     This will output- The key is  2   Explanation  The function array search   has two arguments  The first one is the value that you want to search  The second is where the function should search  The function array column   gets the values of the elements which key is   uid    Summary  So you could use it as   array search  breville-one-touch-tea-maker-BTM800XL   array column  products   slug       or  if you prefer      define function function array search multidim  array   column   key       return  array search  key  array column  array   column           use it array search multidim  products   slug    breville-one-touch-tea-maker-BTM800XL      The original example by xfoxawy  can be found on the DOCS  The array column   page     Update  Due to Vael comment I was curious  so I made a simple test to meassure the performance of the method that uses array search and the method proposed on the accepted answer    I created an array which contained 1000 arrays  the structure was like this  all data was randomized                            id    57fe684fb22a07039b3f196c                index   0               guid    98dd3515-3f1e-4b89-8bb9-103b0d67e613                isActive   true               balance     2 372 04                picture    http   placehold it 32x32                age   21               eyeColor    blue                name    Green                company    MIXERS                  I ran the search test 100 times searching for different values for the name field  and then I calculated the mean time in milliseconds  Here you can see an example   Results were that the method proposed on this answer needed about 2E-7 to find the value  while the accepted answer method needed about 8E-7   Like I said before both times are pretty aceptable for an application using an array with this size  If the size grows a lot  let s say 1M elements  then this little difference will be increased too    Update II  I ve added a test for the method based in array walk recursive which was mentionend on some of the answers here  The result got is the correct one  And if we focus on the performance  its a bit worse than the others examined on the test  In the test  you can see that is about 10 times slower than the method based on array search  Again  this isn t a very relevant difference for the most of the applications    Update III  Thanks to  mickmackusa for spotting several limitations on this method    This method will fail on associative keys   This method will only work on indexed subarrays  starting from 0 and have consecutively ascending keys

User · Answer

Very simple   function myfunction  products   field   value       foreach  products as  key   gt   product             if    product  field       value            return  key          return false

User · Answer

This class method can search in array by multiple conditions   class Stdlib Array       public static function multiSearch array  array  array  pairs                 found   array            foreach   array as  aKey   gt   aVal                 coincidences   0              foreach   pairs as  pKey   gt   pVal                    if  array key exists  pKey   aVal   amp  amp   aVal  pKey      pVal                         coincidences                                                if   coincidences    count  pairs                      found  aKey     aVal                                   return  found                  Example    data   array      array  foo    gt   test4    bar    gt   baz        array  foo    gt   test     bar    gt   baz        array  foo    gt   test1    bar    gt   baz3        array  foo    gt   test     bar    gt   baz        array  foo    gt   test     bar    gt   baz4        array  foo    gt   test4    bar    gt   baz1        array  foo    gt   test     bar    gt   baz1        array  foo    gt   test3    bar    gt   baz2        array  foo    gt   test     bar    gt   baz        array  foo    gt   test     bar    gt   baz        array  foo    gt   test4    bar    gt   baz1        result   Stdlib Array  multiSearch  data  array  foo    gt   test4    bar    gt   baz1      var dump  result     Will produce   array 2       5   gt    array 2          foo    gt      string 5   test4        bar    gt      string 4   baz1         10   gt    array 2          foo    gt      string 5   test4        bar    gt      string 4   baz1

User · Answer

function search  array   key   value           results   array          if  is array  array                   if  isset  array  key    amp  amp   array  key      value                results      array            foreach   array as  subarray                results   array merge  results  search  subarray   key   value                 return  results

User · Answer

Use this function   function searchThroughArray  search array  lists           try              foreach   lists as  key   gt   value                    if is array  value                        array walk recursive  value  function  v   k  use  search   key  value  amp  val                           if strpos  v   search      false     val  key   value                                       else                      if strpos  value   search      false     val  key   value                                               return  val            catch  Exception  e                return false                    and call function   print r searchThroughArray  breville-one-touch-tea-maker-BTM800XL   products

User · Answer

I would do like below  where  products is the actual array given in the problem at the very beginning   print r    array search  breville-variable-temperature-kettle-BKE820XL      array map function  product  return  product  slug      products

User · Answer

For the next visitor coming along  use the recursive array walk  it visits every  leaf  in the multidimensional array  Here s for inspiration   function getMDArrayValueByKey  a   k         r           array walk recursive   a                             function   item   key  use   k   amp  r   if   key     k   r      item                                    return  r

[php] PHP Multidimensional Array Searching (Find key by specific value)

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