Are there any security considerations to keep in mind when implementing a search form in PHP?

When implementing a search form in PHP, it is important to sanitize user input to prevent SQL injection attacks. This can be done by using prepared statements with parameterized queries to securely interact with the database. Additionally, input validation should be performed to ensure that only expected data is accepted. 

// Sanitize user input for search query
$search_query = isset($_GET['search']) ? $_GET['search'] : '';
$search_query = trim($search_query);
$search_query = filter_var($search_query, FILTER_SANITIZE_STRING);

// Prepare and execute a parameterized query
$stmt = $pdo->prepare("SELECT * FROM table_name WHERE column_name LIKE :search_query");
$stmt->execute(['search_query' => "%$search_query%"]);

// Fetch results
$results = $stmt->fetchAll();

Keywords

SQL injection cross-site scripting input validation prepared statements CSRF protection

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