example.php

<?php

unset(
    $GLOBALS,
    $_ENV,
    $_REQUEST,
    $_SERVER,
    $_GET,
    $_COOKIE,
    $_FILES,
    $_POST
);

$array = [
    'time' => [
        'unix_epoch' => time(),
        'unix_epoch_microtime' => microtime(),
        'unix_epoch_microtime_float ' => microtime(true),
    ],
];

meminfo_dump(fopen('./meminfo.json', 'w'));