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@ 2016-01-19T00:57:20Z

<?php

$records = [
    [
        'id'         => 2135,
        'first_name' => 'John',
        'last_name'  => 'Doe',
        'owner'      => [
        	[
              	'id'         =>345,
                'first_name' => 'Johnsssss',
                'last_name'  => 'Doe'
            ]
        ]
    ],
    [
        'id'         => 3245,
        'first_name' => 'Sally',
        'last_name'  => 'Smith',
        'owner'      => [
            [
            	'id'         => 345,
            	'first_name' => 'Johnddddd',
            	'last_name' => 'Doe'
            ]
        ]
    ],
    [
        'id' => 5342,
        'first_name' => 'Jane',
        'last_name' => 'Jones',
    ],
    [
        'id' => 5623,
        'first_name' => 'Peter',
        'last_name' => 'Doe',
    ]
];


array_map(function($record){
    if(array_key_exists("owner", $record)){
       	$first_names = array_column($record['owner'], 'id');
        print_r($first_names);	
    }
    
}, $records);


echo PHP_EOL;


foreach($records as $record){
    if(array_key_exists("owner", $record)){
       	$first_names = array_column($record['owner'], 'id');
        print_r($first_names);	
    }
    
}

Output for rfc.property-hooks, git.master, git.master_jit: Array ( [0] => 345 ) Array ( [0] => 345 ) Array ( [0] => 345 ) Array ( [0] => 345 )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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