What are some best practices for sanitizing and validating user input in PHP forms to prevent potential vulnerabilities?

When working with PHP forms, it is crucial to sanitize and validate user input to prevent potential vulnerabilities such as SQL injection or cross-site scripting attacks. To sanitize user input, you can use functions like htmlspecialchars() to escape special characters. For validation, you can use functions like filter_var() with appropriate filters to ensure the input meets certain criteria. 

// Sanitize user input
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);

// Validate email input
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Handle invalid email input
}

// Use sanitized and validated input in your application

Keywords

filter_var htmlspecialchars htmlentities validation security

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