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@ 2019-03-23T16:45:08Z

<?php
$collections = [
            0 => [
                0 => [
                    "attr_id" => 23,
                    "value" => "Single Side"
                ],
                1 => [
                    "attr_id" => 23,
                    "value" => "Double Side"
                ],
            ],
            1 => [
                0 => [
                    "attr_id" => 31,
                    "value" => "A4"
                ],
                1 => [
                    "attr_id" => 31,
                    "value" => "12x18"
                ],
                2 => [
                    "attr_id" => 31,
                    "value" => "B5"
                ],
                3 => [
                    "attr_id" => 31,
                    "value" => "A5"
                ]
            ]
        ];
$expected = [];        
foreach($collections as $k=>$v){
            foreach($v as $k1=>$v1){
                $expected[$v1['attr_id']][] = $v1['value'];
            }
        }
print_r($expected)        
?>

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [23] => Array ( [0] => Single Side [1] => Double Side ) [31] => Array ( [0] => A4 [1] => 12x18 [2] => B5 [3] => A5 ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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