What are common pitfalls when trying to insert multiple variables into a database using PHP?

One common pitfall when inserting multiple variables into a database using PHP is not properly sanitizing the input data, leaving the application vulnerable to SQL injection attacks. To solve this, you should always use prepared statements with parameterized queries to securely insert data into the database.

// Sample code snippet demonstrating the use of prepared statements to insert multiple variables into a database

// Assuming $conn is the database connection object

// Define the SQL query with placeholders for the variables
$sql = "INSERT INTO table_name (column1, column2) VALUES (?, ?)";

// Prepare the SQL statement
$stmt = $conn->prepare($sql);

// Bind the variables to the placeholders
$stmt->bind_param("ss", $variable1, $variable2);

// Set the variables' values
$variable1 = "value1";
$variable2 = "value2";

// Execute the statement
$stmt->execute();

// Close the statement and connection
$stmt->close();
$conn->close();