How to get an array of specific key in multidimensional array without looping

Question

Let s assume I have the following multidimensional array  retrieved from MySQL or a service      array      array           id    gt  xxx           name    gt  blah            array           id    gt  yyy           name    gt  blahblah            array           id    gt  zzz           name    gt  blahblahblah            Can we get an array of ids in one  built-in  php function call  or one line of code  I am aware of the traditional looping and getting the value but I don t need this     foreach  users as  user         ids      user  id      print r  ids     Maybe some array map   and call user func array   can do the magic

User · Answer

You can also use array reduce   if you prefer a more functional approach  For instance     userNames   array reduce  users  function   carry   user        array push  carry   user  name         return  carry            Or if you like to be fancy    userNames       array map function   user  use   amp  userNames        userNames    user  name        users     This and all the methods above do loop behind the scenes though

User · Answer

Since PHP 5 5  you can use array column   ids   array column  users   id     This is the preferred option on any modern project  However  if you must support PHP lt 5 5  the following alternatives exist  Since PHP 5 3  you can use array map with an anonymous function  like this   ids   array map function   ar   return  ar  id       users    Before  Technically PHP 4 0 6    you must create an anonymous function with create function instead   ids   array map create function   ar    return  ar  quot id quot        users

User · Answer

If id is the first key in the array  this ll do    ids   array map  current    users     You should not necessarily rely on this though

User · Answer

PHP 5 5   Starting PHP5 5  you have array column   available to you  which makes all of the below obsolete    PHP 5 3    ids   array map function   ar   return  ar  id       users        Solution by  phihag will work flawlessly in PHP starting from PHP 5 3 0  if you  need support before that  you will need to copy that wp list pluck   PHP  lt  5 3  Wordpress 3 1   In Wordpress there is a function called wp list pluck If you re using Wordpress that solves your problem   PHP  lt  5 3  If you re not using Wordpress  since the code is open source you can copy paste the code in your project  and rename the function to something you prefer  like array pick   View source here

[php] How to get an array of specific "key" in multidimensional array without looping

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