Online PHP editor | output 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 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14, 8.5.0: <pre>Array ( [0] => 0->one [1] => 0->two->one [2] => 0->two->0->one ) </pre>
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.3.28: /bin/php-8.3.28: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.3.28)
Process exited with code 1.

preferences:dark modelive previewkey bindings