How can variables be used to dynamically construct SQL queries based on user input in PHP?

When constructing SQL queries based on user input in PHP, variables can be used to dynamically build the query string. This allows for flexibility in the query construction based on user input, while also helping to prevent SQL injection attacks. By sanitizing and validating user input before using it in the query, you can ensure the security and reliability of your application. 

// Example of dynamically constructing an SQL query based on user input

// Assuming $userInput is the user's input
$userInput = $_POST['input'];

// Sanitize and validate user input
$sanitizedInput = filter_var($userInput, FILTER_SANITIZE_STRING);

// Construct the SQL query using the sanitized input
$sql = "SELECT * FROM table WHERE column = '$sanitizedInput'";

// Execute the query using your database connection
$result = mysqli_query($connection, $sql);

// Process the results as needed

Keywords

PHP variables SQL queries user input dynamic construction

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