How can PHP developers optimize their code to efficiently filter and display data based on user input without compromising performance?

To efficiently filter and display data based on user input without compromising performance, PHP developers can use prepared statements to prevent SQL injection attacks, implement pagination to limit the amount of data fetched at once, and use caching mechanisms to reduce database queries. 

// Example code snippet implementing the mentioned optimizations

// Connect to the database
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// Sanitize user input
$searchTerm = $_GET['search'] ?? '';
$searchTerm = htmlspecialchars($searchTerm);

// Prepare the SQL query with a prepared statement
$stmt = $pdo->prepare("SELECT * FROM mytable WHERE column LIKE :searchTerm");
$stmt->bindParam(':searchTerm', $searchTerm, PDO::PARAM_STR);
$stmt->execute();

// Implement pagination to limit the amount of data fetched
$page = $_GET['page'] ?? 1;
$perPage = 10;
$stmt->bindParam(':limit', $perPage, PDO::PARAM_INT);
$stmt->bindParam(':offset', ($page - 1) * $perPage, PDO::PARAM_INT);

// Use caching mechanisms to reduce database queries
$cacheKey = 'search_' . md5($searchTerm . '_' . $page);
if ($data = apc_fetch($cacheKey)) {
    // Use cached data
} else {
    // Fetch data from the database
    $data = $stmt->fetchAll();
    apc_store($cacheKey, $data, 60); // Cache data for 60 seconds
}

// Display the data
foreach ($data as $row) {
    echo $row['column'] . "<br>";
}

Keywords

PHP optimization filtering user input performance

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