What is the issue with incrementing the 'inuse' value when the HWID does not match the database?

Incrementing the 'inuse' value when the HWID does not match the database can lead to inaccurate data and potential misuse of resources. To solve this issue, we should first check if the HWID matches the database before incrementing the 'inuse' value. If the HWID does not match, we should handle it accordingly, such as displaying an error message or rejecting the request. 

// Check if the HWID matches the database before incrementing 'inuse' value
$hwid = $_POST['hwid'];
$query = "SELECT * FROM devices WHERE hwid = '$hwid'";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0) {
    // Increment 'inuse' value
    $updateQuery = "UPDATE devices SET inuse = inuse + 1 WHERE hwid = '$hwid'";
    mysqli_query($connection, $updateQuery);
} else {
    // Handle mismatched HWID
    echo "Error: HWID does not match the database";
}

Keywords

PHP SQL database increment mismatch

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