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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 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: Array ( [23] => Array ( [0] => Single Side [1] => Double Side ) [31] => Array ( [0] => A4 [1] => 12x18 [2] => B5 [3] => A5 ) )

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57.68 ms | 1691 KiB | 4 Q