What is the error message "mysql_fetch_assoc() expects parameter 1 to be resource, boolean given" indicating in the PHP script?

The error message "mysql_fetch_assoc() expects parameter 1 to be resource, boolean given" indicates that the function is receiving a boolean value instead of a resource as its first parameter. This typically occurs when the SQL query fails to execute, returning a boolean false instead of a resource. To solve this issue, you should check if the query was successful before trying to fetch the results.

// Assuming $result contains the result of the SQL query
if($result !== false) {
    while($row = mysql_fetch_assoc($result)) {
        // Process each row here
    }
} else {
    // Handle the case when the query fails
}