get all the values of property in array objects

Question

i have an array full of objects , in each object there is properties i wanna collect a specific property in all the object that i have and assign them to a variable.

this is the array

[
  {
    "id": 23,
    "user_id": 2,
    "friend_id": 2,
    "created_at": "2018-05-23 21:00:07",
    "updated_at": "2018-05-23 21:00:07"
  },
  {
    "id": 31,
    "user_id": 2,
    "friend_id": 1,
    "created_at": "2018-05-23 21:00:07",
    "updated_at": "2018-05-23 21:00:07"
  },
  {
    "id": 32,
    "user_id": 2,
    "friend_id": 4,
    "created_at": "2018-05-23 21:00:07",
    "updated_at": "2018-05-23 21:00:07"
  }
]

i wanna get the value of friend_id

whats the best practices to do so? thanks.

array_column works just with the nested arrays right ! not with nested objects — Jone
– Jone, Commented May 23, 2018 at 21:33
If you're getting the array from JSON, you can use the optional argument to json_decode() to create associative arrays instead of objects. — Barmar
– Barmar, Commented May 23, 2018 at 21:39

Jason bamber · Accepted Answer · 2018-05-23 21:49:59Z

1

That looks like a json string, so you would need to decode it first:

$friends = json_decode($json_string, true);

The you can extract the ids with array column as suggested in comments, or a foreach loop if you are using php 5.4 or below:

$friend_ids = array_column($friends, 'friend_id');
//OR
$friend_ids=array();
foreach($friends as $friend)
    $friend_ids[] = $friend['friend_id'];

edited May 23, 2018 at 21:49

answered May 23, 2018 at 21:41

Jason bamber

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Comments

Paul Carlton · Accepted Answer · 2018-05-23 21:38:34Z

0

You can use array map. What this will do is assign all the friend id's into a new array. I'm passing an anonymous function that returns just the friend id out of the object. For more info on array_map: http://php.net/manual/en/function.array-map.php

<?php 
$json = '[
  {
    "id": 23,
    "user_id": 2,
    "friend_id": 2,
    "created_at": "2018-05-23 21:00:07",
    "updated_at": "2018-05-23 21:00:07"
  },
  {
    "id": 31,
    "user_id": 2,
    "friend_id": 1,
    "created_at": "2018-05-23 21:00:07",
    "updated_at": "2018-05-23 21:00:07"
  },
  {
    "id": 32,
    "user_id": 2,
    "friend_id": 4,
    "created_at": "2018-05-23 21:00:07",
    "updated_at": "2018-05-23 21:00:07"
  }
]';

$jsonObject = json_decode($json);

$newArray = array_map(function($a) {
  return $a->friend_id;
}, $jsonObject);

print_r($newArray);

answered May 23, 2018 at 21:38

Paul Carlton

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1 Comment

Jone Over a year ago

this works just fine too , i guess using array_column method will be better and less hassle

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