Get YAML file in a flat structure with joined keys

gistfile1.php

use Symfony\Component\Yaml\Yaml;

function flattenKeys($data, $parent = ''){
    $result = array();

    if (!is_array($data)) {
        return $result;
    }

    foreach ($data as $key => $value) {
        $fullKey = ($parent == '') ? $key : $parent.'.'.$key;

        if (is_array($value)){
            $result = array_merge($result, flattenKeys($value, $fullKey));
        } else {
            $result[$fullKey] = $value;
        }
    }

    return $result;
}

$yaml = Yaml::parse($pathToYmlFile);

$flatKeys = flattenKeys($yaml);