How can the error "Query was empty" in PHP be resolved, and what are the potential causes of this error in MySQL queries?

To resolve the "Query was empty" error in PHP, you need to ensure that the query being executed is not empty or null. This error typically occurs when the query string is not properly constructed or is empty. Double-check the query string and make sure it is correctly formatted and contains the necessary SQL statements.

// Example PHP code snippet to prevent "Query was empty" error
$query = "SELECT * FROM users WHERE id = 1";
if(!empty($query)){
    $result = mysqli_query($connection, $query);
    // Rest of the code to process the query result
} else {
    echo "Error: Query is empty";
}