Online PHP editor | rfc for QOpXI

@ 2020-01-16T15:17:45Z

<?php

$arr = [
    ['one' => 'once',
     'two' => ['one' => 'twice', 'two' => 'twice', ['one' => 'thrice']],
     'three' => 'once',]
];

$needle = 'one'; // the key we're looking for
$result = pathFinder($arr, $needle);

/**
 * function pathFinder() returns the path(s) to a key in an array.
 *
 * @param array  $arr    the subject array
 * @param string $needle the key we're looking for
 *
 * @return array            the paths leading to the key we're looking for
 */
function pathFinder(array $arr = [], $needle = ''): array
{
    static $path = '';
    static $paths = [];

    foreach ($arr as $key => $value) {
        if (is_array($value)) {
            $path .= $key . "->";
            pathFinder($value, $needle);
        } else {
            if ($key === $needle) {
                $paths[] = $path . $key; // store path
            }
        }
    }
    return $paths; // return all found paths to key $needle
}

echo '<pre>';
print_r($result);
echo '</pre>';

Output for git.master, git.master_jit, rfc.property-hooks: <pre>Array ( [0] => 0->one [1] => 0->two->one [2] => 0->two->0->one ) </pre>

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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