bench_walker_ref.php

<?php

declare(strict_types=1);

/**
 * Walks nested array structures to retrieve values.
 */
class ArrayWalkerReference
{
    /**
     * Walks the specified nested array elements according to the ordered list
     * of keys specified by the path and returns the value of the matching
     * element.
     *
     * @param array $array Nested array elements.
     * @param array $path Path.
     *
     * @return mixed The matching element's value if found, otherwise null.
     */
    public static function walk(array $array, array $path)
    {
        while (count($path)) {
            if (!is_array($array)) {
                return null;
            }
            $array = &$array[array_shift($path)];
        }
        return $array;
    }
}

$array = ['a' => ['b' => ['c' => 'foo']]];
$path = ['a', 'b', 'c'];

$times = 1000000;



$start = microtime(true);

for ($i = 0; $i < $times; ++$i) {
    ArrayWalkerReference::walk($array, $path);
}

printf("reference: %.4f\n", microtime(true) - $start);