Treading parser

<?php
umask(0);
define('FROM', 'from');
define('KEYSPACE', 'keyspace');
define('SLEEP', 60);

$mail_user = 'address';
$mail_pass = 'password';

$cluster = Cassandra::cluster()->build();
$session = $cluster->connect(KEYSPACE);
$statement = new Cassandra\SimpleStatement("CREATE TABLE IF NOT EXISTS data (id UUID, start TIMESTAMP, end TIMESTAMP, status VARCHAR, buy VARCHAR, price FLOAT, profit FLOAT, loss FLOAT, PRIMARY KEY ((id), start)) WITH CLUSTERING ORDER BY (start DESC);");
$session->execute($statement);

$pid = pcntl_fork();
if ( $pid > 0 ){
    echo "Daemon started";
    exit 0;
}else{
    $sid = posix_setsid();
    chdir('/');
    file_put_contents('daemon.pid', getmypid());
    $inbox = imap_open('{imap.mail.ru:993/imap/ssl}INBOX', $mail_user, $mail_pass);
    if ( $inbox == false ){
        file_put_contents('errors.log', imap_last_error());
        exit -1;
    }
    while (true){
        $emails = imap_search($inbox, 'ALL');
        foreach($emails as $email_number) {
            $message = imap_fetch_overview($inbox, $email_number, 0);
            if ( isset($message[0]->from) && mb_strtolower($message[0]->from, 'UTF-8') == FROM && isset($message[0]->seen) && $message[0]->seen != 1 ){
                try{
                    $data = imap_fetchbody($inbox, $email_number, 2);
                    preg_match_all('/(?<=\bOrdine\s)(?:[\w-]+)/is', $data, $matches);
                    $order = isset($matches[0]) ? $matches[0] : '';
                    preg_match_all('/(?<=\bPrezzo\s)(?:[\w-]+)/is', $data, $matches);
                    $price = isset($matches[0]) ? floatval($matches[0]) : '';
                    preg_match_all('/(?<=\bTake profit\s)(?:[\w-]+)/is', $data, $matches);
                    $profit = isset($matches[0]) ? floatval($matches[0]) : '';
                    preg_match_all('/(?<=\bStop loss\s)(?:[\w-]+)/is', $data, $matches);
                    $loss = isset($matches[0]) ? floatval($matches[0]) : '';
                    preg_match_all('/(?<=\bCompra\s)(?:[\w-]+)/is', $data, $matches);
                    $buy = isset($matches[0]) ? $matches[0] : '';

                    $start = NULL; //PARSE DATE
                    $end = NULL; //PARSE DATE

                    $start = new Cassandra\Timestamp($start);
                    $end = new Cassandra\Timestamp($end);
                    $price = Cassandra\Float($price);
                    $profit = Cassandra\Float($profit);
                    $loss = Cassandra\Float($loss);
                    $statement = $session->prepare("INSERT INTO data (id, start, end, status, buy, price, profit, loss) VALUES (uuid(), ?, ?, ?, ?, ?, ?, ?);");
                    $session->execute($statement, new Cassandra\ExecutionOptions(array('arguments' => array($start, $end, $order, $buy, $price, $profit, $loss))));
                    /*
                        Ordine in attesa
                        Compra USD/CHF
                        Prezzo 0,9923
                        Take profit   0,9968
                        Stop loss 0,9868
                        dal 12:35 08-03-2016 GMT al 16:35 08-03-2016 GMT
                    */
                    imap_setflag_full($inbox, $email_number, "\\Seen");
                }catch( Exception $ex ){
                    file_put_contents('errors.log', $ex->getMessage());
                }
            }
        }
        sleep(SLEEP);
    }
}
?>