Parse ini-style configuration with compound keys in PHP. Cycle vs recursion

unfold-config-keys.php

<?php
// Recursion splitting: 0.0020239353179932 sec
// Cycle splitting: 0.001431941986084 sec

// Recursion splitting: 0.000885009765625 sec
// Cycle splitting: 0.00057697296142578 sec


$i = <<<INI
db.user.name = vasya
db.user.password = asd123
db.user.type.geo.x = 0
db.user.type.geo.y = 0
db.user.type.geo.db.user.type.geo.db.user.type.geo.db.user.type.geo.db.user.type.geo.db.user.type.geo.y = ok
db.type = postgresql
INI;

$parsedArr = parse_ini_string($i);

// recursion
$splittedArrRec = [];
benchmark();
foreach ($parsedArr as $k => $v) {
    splitterRec($k, $v, $splittedArrRec);
}
benchmark('true', 'Recursion splitting: ');

function splitterRec($key, $val, array &$arr) {
    if (strpos($key, '.') !== false) {
        $pieces = explode('.', $key, 2);
    
        if (!isset($arr[$pieces[0]])) {
            $arr[$pieces[0]] = [];
        }

        splitterRec($pieces[1], $val, $arr[$pieces[0]]);
    } else {
        $arr[$key] = $val;
    }
}



// w/o recursion
benchmark();
splitter($parsedArr);
benchmark(true, 'Cycle splitting: ');

function splitter(array $arr) {
    $splitted = [];

    foreach ($arr as $k => $v) {
        $x = &$splitted;
        $pieces = explode('.', $k);

        while (count($pieces) > 1) {
            $piece = array_shift($pieces);

            if (!isset($x[$piece])) $x[$piece] = [];

            $x = &$x[$piece];
        }

        $x[$pieces[0]] = $v;
    }

    return $splitted;
}

function benchmark($end = false, $label = '') {
    static $before;

    if ($end) {
        $after = microtime(true);
        echo $label . ($after - $before) . " sec\n";
    } else {
        $before = microtime(true);
    }
}