PHP - Extracting a property from an array of objects

Question

I\'ve got an array of cats objects:

$cats = Array
    (
        [0] => stdClass Object
            (
                [id] => 15
            ),
                 


        

Answer 1

CODE

<?php

# setup test array.
$cats = array();
$cats[] = (object) array('id' => 15);
$cats[] = (object) array('id' => 18);
$cats[] = (object) array('id' => 23);

function extract_ids($array = array())
{
    $ids = array();
    foreach ($array as $object) {
        $ids[] = $object->id;
    }
    return $ids;
}

$cat_ids = extract_ids($cats);
var_dump($cats);
var_dump($cat_ids);

?>

OUTPUT

# var_dump($cats);
array(3) {
  [0]=>
  object(stdClass)#1 (1) {
    ["id"]=>
    int(15)
  }
  [1]=>
  object(stdClass)#2 (1) {
    ["id"]=>
    int(18)
  }
  [2]=>
  object(stdClass)#3 (1) {
    ["id"]=>
    int(23)
  }
}

# var_dump($cat_ids);
array(3) {
  [0]=>
  int(15)
  [1]=>
  int(18)
  [2]=>
  int(23)
}

I know its using a loop, but it's the simplest way to do it! And using a function it still ends up on a single line.

Answer 2

The create_function() function is deprecated as of php v7.2.0. You can use the array_map() as given,

function getObjectID($obj){
    return $obj->id;
}

$IDs = array_map('getObjectID' , $array_of_object);

Alternatively, you can use array_column() function which returns the values from a single column of the input, identified by the column_key. Optionally, an index_key may be provided to index the values in the returned array by the values from the index_key column of the input array. You can use the array_column as given,

$IDs = array_column($array_of_object , 'id');

Answer 3

If you have PHP 5.5 or later, the best way is to use the built in function array_column():

$idCats = array_column($cats, 'id');

But the son has to be an array or converted to an array

Answer 4

The solution depends on the PHP version you are using. At least there are 2 solutions:

First (Newer PHP versions)

As @JosepAlsina said before the best and also shortest solution is to use array_column as following:

$catIds = array_column($objects, 'id');

Notice: For iterating an array containing \stdClasses as used in the question it is only possible with PHP versions >= 7.0. But when using an array containing arrays you can do the same since PHP >= 5.5.

Second (Older PHP versions)

@Greg said in older PHP versions it is possible to do following:

$catIds = array_map(create_function('$o', 'return $o->id;'), $objects);

But beware: In newer PHP versions >= 5.3.0 it is better to use Closures, like followed:

$catIds = array_map(function($o) { return $o->id; }, $objects);

The difference

First solution creates a new function and puts it into your RAM. The garbage collector does not delete the already created and already called function instance out of memory for some reason. And that regardless of the fact, that the created function instance can never be called again, because we have no pointer for it. And the next time when this code is called, the same function will be created again. This behavior slowly fills your memory...

Both examples with memory output to compare them:

BAD

while (true)
{
    $objects = array_map(create_function('$o', 'return $o->id;'), $objects);

    echo memory_get_usage() . "\n";

    sleep(1);
}

// the output
4235616
4236600
4237560
4238520
...

GOOD

while (true)
{
    $objects = array_map(function($o) { return $o->id; }, $objects);

    echo memory_get_usage() . "\n";

    sleep(1);
}

// the output
4235136
4235168
4235168
4235168
...

This may also be discussed here

Memory leak?! Is Garbage Collector doing right when using 'create_function' within 'array_map'?