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@ 2021-12-25T12:57:10Z

<?php

$array1 = array(
    0 => array(
            2 => array(
                    "type" => 1,
                    "score" => 10,
                ),
        ),
    1 => array(
            2 => array(
                    "type" => 2,
                    "score" => 5,
                ),
        ),
    2 => array(
            2 => array(
                    "type" => 3,
                    "score" => 4,
                ),
        ),
    3 => array(
            2 => array(
                    "type" => 4,
                    "score" => 60,
                ),
        ),
    4 => array(
            1 => array(
                    "type" => 1,
                    "score" => 5,
                ),
        ),
    );

$array2 = array(0 => 2, 1 => 1);

$array3 = array(
    2 => array(
            "score" => 79
        ),
    1 => array(
            "score" => 5
        ),
    );    

foreach( $array1 as $array1x ){
    $key=key($array1x);
    if( in_array($key, $array2) ){
        $this_score = $array1x[$key]['score'];
        $cum_score = isset($newarray[$key]['score']) ? $newarray[$key]['score'] : 0;
        $newarray[$key]['score'] = $cum_score + $this_score;
    }
}
print_r($newarray);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [2] => Array ( [score] => 79 ) [1] => Array ( [score] => 5 ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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