What are the best practices for updating PHP files on a server to avoid security vulnerabilities?

To avoid security vulnerabilities when updating PHP files on a server, it is important to regularly update PHP to the latest stable version, use secure coding practices, and sanitize user input to prevent SQL injection and cross-site scripting attacks. 

<?php
// Example of sanitizing user input to prevent SQL injection
$username = mysqli_real_escape_string($conn, $_POST['username']);
$password = mysqli_real_escape_string($conn, $_POST['password']);

// Use prepared statements to prevent SQL injection
$stmt = $conn->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);
$stmt->execute();
$result = $stmt->get_result();
?>

Keywords

PHP server security vulnerabilities updating best practices

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