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@ 2020-11-02T22:51:10Z

<?php

function freqCount(array $values, $searchValue): array
{
    $frequencies = computeFrequencies($values, $searchValue, 0);

    return array_map(static fn($key) => [$key, $frequencies[$key]], array_keys($frequencies));
}

function computeFrequencies(array $values, $searchValue, int $depth): array
{
    $frequencies = [$depth => 0];

    foreach ($values as $value) {
        if ($value === $searchValue) {
            $frequencies[$depth]++;
        } elseif (is_array($value)) {
            foreach (computeFrequencies($value, $searchValue, $depth + 1) as $deeperDepth => $frequency) {
                $frequencies[$deeperDepth] = ($frequencies[$deeperDepth] ?? 0) + $frequency;
            }
        }
    }

    return $frequencies;
}

print_r(freqCount([1, 4, 4, [1, 1, [1, 2, 1, 1]]], 1));
print_r(freqCount([1, 5, 5, [5, [1, 2, 1, 1], 5, 5], 5, [5]], 5));
print_r(freqCount([1, [2], 1, [[2]], 1, [[[2]]], 1, [[[[2]]]]], 2));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [0] => 0 [1] => 1 ) [1] => Array ( [0] => 1 [1] => 2 ) [2] => Array ( [0] => 2 [1] => 3 ) ) Array ( [0] => Array ( [0] => 0 [1] => 3 ) [1] => Array ( [0] => 1 [1] => 4 ) [2] => Array ( [0] => 2 [1] => 0 ) ) Array ( [0] => Array ( [0] => 0 [1] => 0 ) [1] => Array ( [0] => 1 [1] => 1 ) [2] => Array ( [0] => 2 [1] => 1 ) [3] => Array ( [0] => 3 [1] => 1 ) [4] => Array ( [0] => 4 [1] => 1 ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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