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@ 2022-05-18T23:37:16Z

<?php

$array = [
    '7' => '15',
    '20' => '6',
    '11' => '9',
    '14' => '6',
    '4' => '15'
 ];
 
 $result = [];
 foreach ($array as $key => $value) {
     $result[$value] = ($result[$value] ?? 0) + $key;
 }
 var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

25.67 ms | 404 KiB | 5 Q