Are there any common pitfalls to avoid when using JavaScript or buttons to submit variable database queries in PHP?

One common pitfall to avoid when using JavaScript or buttons to submit variable database queries in PHP is not properly sanitizing user input. This can leave your application vulnerable to SQL injection attacks. To solve this issue, always use prepared statements or parameterized queries to safely handle user input when constructing database queries. 

// Example of using prepared statements to safely handle user input in a database query

// Assuming $conn is your database connection

// Retrieve user input from a form submission
$userInput = $_POST['user_input'];

// Prepare a SQL statement with a placeholder for the user input
$stmt = $conn->prepare("SELECT * FROM table_name WHERE column_name = ?");

// Bind the user input to the prepared statement
$stmt->bind_param("s", $userInput);

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

// Fetch the results
$result = $stmt->get_result();

// Process the results as needed
while ($row = $result->fetch_assoc()) {
    // Do something with the data
}

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

Keywords

JavaScript buttons database queries PHP variable submission

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