What best practice recommendations were given for handling form input validation in PHP?

When handling form input validation in PHP, it is recommended to use server-side validation to ensure data integrity and security. This involves checking user input for errors or malicious content before processing it further. One common approach is to use PHP functions like filter_var() or regular expressions to validate input fields such as email addresses, passwords, or numbers. 

// Example of form input validation using filter_var() function
$email = $_POST['email'];

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Email is valid, proceed with processing
} else {
    // Invalid email, display error message to user
    echo "Invalid email address";
}

Keywords

filter_var htmlspecialchars validation library input sanitization error handling

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