What are common issues when passing form data to a database in PHP?

One common issue when passing form data to a database in PHP is not properly sanitizing the input data, which can lead to SQL injection attacks. To solve this issue, you should always use prepared statements or parameterized queries to securely pass form data to the database. 

// Connect to the database
$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 a SQL statement using a prepared statement
$stmt = $conn->prepare("INSERT INTO table_name (column1, column2) VALUES (?, ?)");
$stmt->bind_param("ss", $value1, $value2);

// Set the form data values
$value1 = $_POST['form_field1'];
$value2 = $_POST['form_field2'];

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

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

Keywords

SQL injection data validation prepared statements PDO error handling

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