Online PHP editor | output for Pgjhq

@ 2016-04-02T12:00:59Z

<?php

$arr = Array
(
    "427" => 
             Array
                (
                    "0" => 277,
                    "1" => 279,
                    "2" => 426,
                    "3" => 428,
                    "4" => 429,
                    "5"=> 430,
                    "6" => 431,
                    "7" => 432,
                    "8" => 433,
                    "9" => 434
                ),

    "280" => 
        
            Array
                (
                    "0" => 281,
                    "1" => 282,
                    "2" => 435,
                    "3" => 436,
                    "4" => 437
                ),

    "283" => Array
                (
                    "0" => 284,
                    "1" => 285,
                    "2" => 286
                )
        );
        
        
$result = [];
array_walk($arr,function($v,$k)use (&$result){
    array_unshift($v,$k);
    $result[$k][] = $v;
});

print_r($result);

Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: Array ( [427] => Array ( [0] => Array ( [0] => 427 [1] => 277 [2] => 279 [3] => 426 [4] => 428 [5] => 429 [6] => 430 [7] => 431 [8] => 432 [9] => 433 [10] => 434 ) ) [280] => Array ( [0] => Array ( [0] => 280 [1] => 281 [2] => 282 [3] => 435 [4] => 436 [5] => 437 ) ) [283] => Array ( [0] => Array ( [0] => 283 [1] => 284 [2] => 285 [3] => 286 ) ) )

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