What are the best practices for error handling and user input validation in PHP?

Error handling and user input validation are crucial in PHP to ensure the security and stability of your application. To handle errors effectively, use try-catch blocks to catch exceptions and handle them gracefully. For user input validation, always sanitize and validate user input to prevent SQL injection, XSS attacks, and other security vulnerabilities. 

// Error handling with try-catch block
try {
    // Code that may throw an exception
} catch (Exception $e) {
    echo 'Error: ' . $e->getMessage();
}

// User input validation example
$userInput = $_POST['user_input'];

// Sanitize user input
$userInput = filter_var($userInput, FILTER_SANITIZE_STRING);

// Validate user input
if (strlen($userInput) < 5) {
    echo 'Input must be at least 5 characters long.';
} else {
    // Process the validated input
}

Keywords

Exception handling filter_var try catch error_reporting sanitize input

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