PHP - find entry by object property from an array of objects

Question

The array looks like    0    gt  stdClass Object                        ID    gt  420              name    gt  Mary              1    gt  stdClass Object                        ID    gt  10957              name    gt  Blah                  And I have a integer variable called  v   How could I select an array entry that has a object where the ID property has the  v value

User · Answer

YurkamTim is right  It needs only a modification   After function    you need a pointer to the external variable by  use  amp  searchedValue   and then you can access the external variable  Also you can modify it    neededObject   array filter       arrayOfObjects      function   e  use   amp  searchedValue            return  e- gt id     searchedValue

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I did this with some sort of Java keymap  If you do that  you do not need to loop over your objects array every time    lt  php    This is your array with objects  object1    object  array  id   gt 123  name   gt  Henk   age   gt 65    object2    object  array  id   gt 273  name   gt  Koos   age   gt 25    object3    object  array  id   gt 685  name   gt  Bram   age   gt 75    firstArray   Array  object1  object2   var dump  firstArray      create a new array  secondArray   Array      loop over all objects foreach  firstArray as  value         fill second        key          value      secondArray  value- gt id     value- gt name     var dump  secondArray    echo  secondArray  123      output   array  size 2    0   gt       object stdClass  1        public  id    gt  int 123       public  name    gt  string  Henk   length 4        public  age    gt  int 65   1   gt       object stdClass  2        public  id    gt  int 273       public  name    gt  string  Koos   length 4        public  age    gt  int 25 array  size 2    123   gt  string  Henk   length 4    273   gt  string  Koos   length 4  Henk

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I posted what I use to solve this very issue efficiently here using a quick Binary Search Algorithm  https   stackoverflow com a 52786742 1678210  I didn t want to copy the same answer   Someone else had asked it slightly differently but the answer is the same

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Fixing a small mistake of the  YurkaTim  your solution work for me but adding use   To use  searchedValue  inside of the function  one solution can be use   searchedValue  after function parameters function   e  HERE   the array filter function only return on  neededObject the if the condition on return is true   If  searchedValue is a string or integer    searchedValue   123456     Value to search   neededObject   array filter       arrayOfObjects      function   e  use   searchedValue            return  e- gt id     searchedValue           var dump  neededObject      To see the output   If  searchedValue is array where we need check with a list    searchedValue   array  1  5       Value to search   neededObject    array filter       arrayOfObjects      function    e   use    searchedValue             return in array   e- gt term id   searchedValue             var dump  neededObject      To see the output

User · Answer

I sometimes like using the array reduce   function to carry out the search  It s similar to array filter   but does not affect the searched array  allowing you to carry out multiple searches on the same array of objects      haystack   array  obj1   obj2          some array of objects  needle    looking for me      the value of the object s property we want to find    carry out the search  search results array   array reduce     haystack     function  result array   current item  use   needle           Found the an object that meets criteria  Add it to the the result array        if   current item- gt someProperty     needle              result array      current item                return  result array         array     initially the array is empty  i e   item not found        report whether objects found if  count  search results array   gt  0     echo  found object s        print r  search results array 0      sample object found   else     echo  did not find object s

User · Answer

I ve found more elegant solution here  Adapted to the question it may look like    neededObject   array filter       arrayOfObjects      function   e  use   searchedValue            return  e- gt id     searchedValue

User · Answer

class ArrayUtils       public static function objArraySearch  array   index   value                foreach  array as  arrayInf                if  arrayInf- gt   index      value                    return  arrayInf                                  return null            Using it the way you wanted would be something like   ArrayUtils  objArraySearch  array  ID   v

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Using array column to re-index will save time if you need to find multiple times    lookup   array column  arr  NULL   id         re-index by  id    Then you can simply  lookup  id  at will

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arr              ID    gt  1         echo array search 1  array column  arr   ID        prints 0      false   Above code echoes the index of the matching element  or false if none  To get the corresponding element  do something like   i   array search 1  array column  arr   ID      element     i     false    arr  i    null    array column works both on an array of arrays  and on an array of objects

User · Answer

You either iterate the array  searching for the particular record  ok in a one time only search  or build a hashmap using another associative array   For the former  something like this   item   null  foreach  array as  struct        if   v     struct- gt ID             item    struct          break            See this question and subsequent answers for more information on the latter - Reference PHP array by multiple indexes

User · Answer

Way to instantly get first value    neededObject   array reduce       arrayOfObjects      function   result   item  use   searchedValue            return  item- gt id     searchedValue    item    result

User · Answer

Try   entry   current array filter  array  function  e  use  v   return  e- gt ID   v         working example here

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I solved this problem by keying the array with the ID  It s simpler and possibly faster for this scenario where the ID is what you re looking for   420    gt  stdClass Object                        name    gt  Mary              10957    gt  stdClass Object                        name    gt  Blah                 Now I can directly address the array   array  v - gt name        Or  if I want to verify the existence of an ID  if  array key exists  v   array

[php] PHP - find entry by object property from an array of objects

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