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@ 2020-03-03T13:42:43Z

<?php

$arr  = [
    [[58 => 32]],    
    [[58 => 34]],
    [[57 => 26]],
    [[57 => 27]],
    [[56 => 16]],
    [[56 => 17]]
];

array_walk_recursive($arr, function($v,$k) use (&$r){
    $r[$k] = isset($r[$k]) ? ($r[$k]+$v) : $v;
});
print_r($r);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_walk_recursive: documentation ( source)

preferences:dark modelive preview

35.8 ms | 405 KiB | 5 Q