What best practices should be followed when designing and implementing a search function in PHP to ensure data security and efficiency?

When designing and implementing a search function in PHP, it is important to follow best practices to ensure data security and efficiency. One key practice is to sanitize user input to prevent SQL injection attacks. Additionally, using prepared statements can help prevent against SQL injection and improve query performance. Lastly, implementing proper error handling and logging can help identify and address any potential security or performance issues. 

// Sanitize user input
$searchTerm = mysqli_real_escape_string($conn, $_GET['searchTerm']);

// Prepare and execute the query using a prepared statement
$stmt = $conn->prepare("SELECT * FROM table WHERE column LIKE ?");
$stmt->bind_param("s", $searchTerm);
$stmt->execute();
$result = $stmt->get_result();

// Handle any errors and log them
if (!$result) {
    error_log("Error executing search query: " . $conn->error);
}

Keywords

SQL injection prepared statements PDO encryption indexing

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