What steps can be taken to troubleshoot and resolve issues related to data handling and insertion in PHP forms?

Issue: When inserting data from a PHP form into a database, it is important to properly handle and sanitize the data to prevent SQL injection attacks and ensure data integrity. Solution: To troubleshoot and resolve issues related to data handling and insertion in PHP forms, follow these steps: 1. Use prepared statements to prevent SQL injection attacks. 2. Validate and sanitize user input before inserting it into the database. 3. Check for any errors or exceptions during the data insertion process. PHP Code Snippet: 

// Establish a database connection
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Prepare and bind the SQL statement
$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $email);

// Sanitize and validate user input
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

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

// Check for errors
if ($stmt->error) {
    echo "Error: " . $stmt->error;
} else {
    echo "Data inserted successfully!";
}

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

Keywords

PHP data handling insertion troubleshooting forms

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