How can the use of quotation marks affect data transmission in PHP forms?

When quotation marks are used in PHP form inputs, it can potentially lead to issues with data transmission, such as SQL injection attacks. To prevent this, it is important to properly sanitize and escape user inputs before processing them in the backend code. One way to do this is by using functions like mysqli_real_escape_string() to escape special characters, including quotation marks, before inserting the data into a database.

// Example of sanitizing user input to prevent SQL injection
$input_value = $_POST['input_field']; // Assuming the form input is received via POST method
$escaped_value = mysqli_real_escape_string($connection, $input_value); // $connection is the database connection object

// Now you can safely use $escaped_value in your SQL query
$query = "INSERT INTO table_name (column_name) VALUES ('$escaped_value')";
mysqli_query($connection, $query);