yfix/yf

<?php

function object_to_array($d)
{
    if (is_object($d)) {
        $d = get_object_vars($d);
    }
    if (is_array($d)) {
        return array_map(__FUNCTION__, $d);
    }
    // Return array
    return $d;
}
function obj2arr(&$obj)
{
    $obj = (array) $obj;
    foreach ($obj as &$v) {
        if (is_array($v)) {
            obj2arr($v);
        }
    }
    return $obj;
}

$f = './airports_active.json';
$a = json_decode(file_get_contents($f));
$a = current($a);

echo 'memory = ' . memory_get_usage() . PHP_EOL;

$ts = microtime(true);
$_a = obj2arr($a);
echo 'obj2arr: ' . round(microtime(true) - $ts, 4) . ', count = ' . count((array) $_a) . PHP_EOL;
unset($_a);

echo 'memory = ' . memory_get_usage() . PHP_EOL;

$ts = microtime(true);
$_a = object_to_array($a);
echo 'object_to_array: ' . round(microtime(true) - $ts, 4) . ', count = ' . count((array) $_a) . PHP_EOL;
unset($_a);

echo 'memory = ' . memory_get_usage() . PHP_EOL;

/* Results for 10MB JSON:
memory = 36668536
obj2arr: 0.202, count = 16114
memory = 36668652
object_to_array: 2.9618, count = 16114
memory = 36668676
*/