cache.php

<?php
function cache_set($key, $val) {
    $val = var_export($val, true);
    // HHVM fails at __set_state, so just use object cast for now
    $val = str_replace('stdClass::__set_state', '(object)', $val);
    // Write to temp file first to ensure atomicity
    $tmp = "/tmp/$key." . uniqid('', true) . '.tmp';
    file_put_contents($tmp, '<?php $val = ' . $val . ';', LOCK_EX);
    rename($tmp, "/tmp/$key");
}

function cache_get($key) {
    @include "/tmp/$key";
    return isset($val) ? $val : false;
}

$data = array_fill(0, 1000000, ‘hi’); // your application data here
cache_set('my_key', $data);

$t = microtime(true);
$data = cache_get(‘my_key’);
echo microtime(true) - $t;