When using mysql_fetch_assoc() in PHP to fetch results from a MySQL query, what does it mean when it returns false and how should this be handled in the code?

When mysql_fetch_assoc() returns false, it means that there are no more rows left to fetch from the result set. This can happen when all rows have been fetched or when the query did not return any results. To handle this in the code, you should check for this condition and take appropriate action, such as closing the connection or performing another operation.

$result = mysql_query("SELECT * FROM table");

if($result){
    while($row = mysql_fetch_assoc($result)){
        // Process the fetched row
    }
    if(mysql_num_rows($result) == 0){
        // No rows were returned
    }
    mysql_free_result($result);
} else {
    // Handle query error
}