What are the best practices for handling and organizing database queries in PHP to avoid errors and improve performance?

To handle and organize database queries in PHP effectively, it is crucial to use prepared statements to prevent SQL injection attacks and improve performance by reusing query execution plans. Additionally, it is recommended to separate database connection logic into a separate file for better organization and maintainability. 

// Create a separate file for database connection logic
// db_connect.php
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
?>

// Use prepared statements to handle database queries
// query.php
<?php
include 'db_connect.php';

$stmt = $conn->prepare("SELECT * FROM users WHERE id = ?");
$stmt->bind_param("i", $id);

$id = 1;
$stmt->execute();
$result = $stmt->get_result();

while ($row = $result->fetch_assoc()) {
    // Handle query results
}

$stmt->close();
$conn->close();
?>

Keywords

SQL injection PDO prepared statements indexing query optimization

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