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@ 2016-07-05T07:10:41Z

<?php

$f = [];

$f['Kitchen']['Dishes']['Mantovarka']=3;
$f['Kitchen']['Dishes']['Castrool']=91;
$f['Kitchen']['Dishes']['Separator']=10;
$f['Kitchen']['Product']=18;
$f['Kitchen']['Textile']=19;
$f['Kitchen']['Blue things One2']['Juicemaker']=25;
$f['Kitchen']['Blue things One']['Freegener']=13;
$f['Kitchen']['Blue things']['Microwave']=4;
$f['Kitchen']['Blue things']['Iron']=24;

function findKeyPath($arr, $key, $path = '') {
    foreach($arr as $k => $value) {
        if(is_array($arr[$k])) {
            $ret = findKeyPath($arr[$k], $key, $path.$k.',');
            if(is_array($ret)) {
                return $ret;
            }
        }else if($k == $key) {
            return explode(',', $path.$key);
        }
    }
    return null;
}

print_r(findKeyPath($f, 'Juicemaker'));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Kitchen [1] => Blue things One2 [2] => Juicemaker )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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