How can the error "Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given" be resolved in PHP?

The error "Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given" occurs when the result of the MySQL query is not a valid resource, but instead a boolean value (typically false) indicating an error. To resolve this issue, you should check if the query was successful before attempting to fetch results using mysql_fetch_array(). This can be done by verifying the result of the query execution.

// Assuming $connection is the MySQL database connection object and $query is the SQL query
$result = mysqli_query($connection, $query);

if($result) {
    while($row = mysqli_fetch_array($result)) {
        // Process each row of the result
    }
} else {
    echo "Error executing query: " . mysqli_error($connection);
}