MYSQLI_TRANS_START_READ_WRITE预版本MySQL 5.6

Question

$conn->begin_transaction(MYSQLI_TRANS_START_READ_WRITE);不会工作，因为XAMPP没有MySQL 5.6，我无法弄清楚如何使新版本正常工作。有没有办法在5.6之前进行这种读/写事务？将其留空或放入MYSQLI_TRANS_START_WITH_CONSISTENT_SNAPSHOT似乎不会使任何插入/更新工作。

PHP函数有任何帮助：

function vote($accid, $postid, $votedir) {
    include $_SERVER['DOCUMENT_ROOT'].'/database.php';
    $conn = new mysqli($sqlservername, $sqlusername, $sqlpassword, $sqldbname);
    $conn->begin_transaction();

    $stmt = $conn->prepare('SELECT vote FROM votes WHERE accid = ? AND postid = ?');
    $stmt->bind_param('ss', $accid, $postid);
    $stmt->execute();
    $result = $stmt->get_result();

    $updateStmt = null;
    if ($result->num_rows == 0) {
        $updateStmt = $conn->prepare('INSERT INTO votes (accid, postid, vote) VALUES (?, ?, ?)');
        $updateStmt->bind_param('ssi', $accid, $postid, $votedir);
    } else {
        $existingVote = $result->fetch_assoc()['vote'];
        $updateStmt = $conn->prepare('UPDATE votes SET vote = ? WHERE accid = ? AND postid = ?');
        if ($existingVote == $votedir) {
            // They're undoing their existing vote
            $updateStmt->bind_param('iss', 0, $accid, $postid);
        } else {
            // They haven't voted before
            $updateStmt->bind_param('iss', $votedir, $accid, $postid);
        }

    }
    $conn->commit();
}