What are some best practices for handling input validation in PHP?

Input validation is crucial in PHP to ensure that user input is safe and meets the expected criteria. Some best practices for handling input validation include using PHP's filter functions, validating input against expected data types, and sanitizing input to prevent SQL injection and cross-site scripting attacks. 

// Example of input validation using PHP filter functions
$username = $_POST['username'];

if (filter_var($username, FILTER_VALIDATE_EMAIL)) {
    // Username is a valid email address
    // Proceed with further processing
} else {
    // Invalid username format
    // Handle the error accordingly
}

Keywords

filter_var htmlspecialchars validation sanitize input validation

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