How can one handle errors such as "Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given" in PHP?

When encountering the error "Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given" in PHP, it means that the query executed did not return a valid resource, possibly due to an error in the query itself. To handle this error, you should first check if the query was successful before attempting to fetch results using mysql_fetch_array(). This can be done by verifying the query result and handling any potential errors accordingly.

// Check if the query was successful before fetching results
$result = mysql_query($query);
if($result === false) {
    // Handle the error, such as displaying a message or logging it
    echo "Error executing query: " . mysql_error();
} else {
    // Proceed with fetching results
    while($row = mysql_fetch_array($result)) {
        // Process the fetched data
    }
}