streams/Code/Lib/Cache.php

<?php

/** @file */

namespace Code\Lib;

    /**
     *  cache api
     */

class Cache
{
    public static function get($key)
    {

        $hash = hash('whirlpool', $key);

        $r = q(
            "SELECT v FROM cache WHERE k = '%s' limit 1",
            dbesc($hash)
        );

        if ($r) {
            return $r[0]['v'];
        }
        return null;
    }

    public static function set($key, $value)
    {

        $hash = hash('whirlpool', $key);

        $r = q(
            "SELECT * FROM cache WHERE k = '%s' limit 1",
            dbesc($hash)
        );
        if ($r) {
            q(
                "UPDATE cache SET v = '%s', updated = '%s' WHERE k = '%s'",
                dbesc($value),
                dbesc(datetime_convert()),
                dbesc($hash)
            );
        } else {
            q(
                "INSERT INTO cache ( k, v, updated) VALUES ('%s','%s','%s')",
                dbesc($hash),
                dbesc($value),
                dbesc(datetime_convert())
            );
        }
    }


    public static function clear()
    {
        q(
            "DELETE FROM cache WHERE updated < '%s'",
            dbesc(datetime_convert('UTC', 'UTC', "now - 30 days"))
        );
    }
}