What are some common methods for input validation in PHP forms?

Input validation is crucial in PHP forms to ensure that the data submitted by users is accurate and safe. Common methods for input validation include using PHP functions like `filter_var` to sanitize and validate input, regular expressions to match specific patterns, and custom validation functions to check for specific criteria. 

// Example of using filter_var to validate an email input
$email = $_POST['email'];
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Email is valid
} else {
    // Email is not valid
}

Keywords

PHP input validation forms filter_var regular expressions

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