Online PHP editor | rfc for F3RJr

@ 2017-12-19T07:58:58Z

<?php

    $arr = Array (
        "0" => Array ( "2" => 123 ),
        "1" => Array ( "4" => 45 ),
        "2" => Array ( "3" => 12 ),
        "3" => Array ( "5" => 2 ),
        "4" => Array ( "2" => 12 ),
        "5" => Array ( "4" => 21 ),
        "6" => Array ( "2" => 12 ),
        "7" => Array ( "3" => 21 ),
        "8" => Array ( "2" => 12 ),
        "9" => Array ( "3" => 21 ),
        "10" => Array ( "2" => 2 ),
        "11" => Array ( "4" => 2 ),
        "12" => Array ( "2" => 2 ),
        "13" => Array ( "4" => 2 ),
        "14" => Array ( "3" => 12 ),
        "15" => Array ( "4" => 12 ),
        "16" => Array ( "2" => 12 ),
        "17" => Array ( "2" => 12 ),
        "18" => Array ( "4" => 12 ),
        "19" => Array ( "3" => 12 ),
        "20" => Array ( "2" => 15 ),
        "21" => Array ( "4" => 21 ),
    );
    
    // find all subarray keys (2,3,4,5)
    foreach($arr as $subarr){
        $keys[] = key($subarr);
    }
    
    // remove duplicate keys
    $keys = array_unique($keys);
    
    // sum values with same key from $arr and save to $sums
    foreach($keys as $key){
        $sums[$key] = array_sum(array_column($arr,$key));    
    }
    
    var_dump($sums);

Output for git.master, git.master_jit, rfc.property-hooks: array(4) { [2]=> int(202) [4]=> int(115) [3]=> int(78) [5]=> int(2) }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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