What security tips should be considered when working with PHP code?

When working with PHP code, it is crucial to consider security measures to prevent vulnerabilities such as SQL injection, cross-site scripting, and data tampering. One important tip is to always sanitize user input and use prepared statements when interacting with databases to prevent SQL injection attacks. 

// Sanitize user input to prevent SQL injection
$user_input = mysqli_real_escape_string($connection, $_POST['user_input']);
```

Another tip is to validate and sanitize all input data from users to prevent cross-site scripting attacks.

```php
// Validate and sanitize input data to prevent cross-site scripting
$user_input = htmlspecialchars($_POST['user_input']);
```

It is also essential to implement proper session handling and authentication mechanisms to secure user data and prevent unauthorized access.

```php
// Implement session handling and authentication
session_start();
if(!isset($_SESSION['user_id'])) {
    // Redirect user to login page
    header("Location: login.php");
    exit();
}

Keywords

SQL injection cross-site scripting input validation password hashing secure file handling

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