What PHP functions or methods can be used to validate email addresses entered in a form, and how can this validation help prevent incorrect or fake email submissions?

To validate email addresses entered in a form, you can use PHP's built-in filter_var function with the FILTER_VALIDATE_EMAIL filter. This validation helps prevent incorrect or fake email submissions by ensuring that the entered email address follows the correct format. 

$email = $_POST['email'];

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Valid email address, proceed with form submission
} else {
    // Invalid email address, display an error message to the user
    echo "Invalid email address";
}

Keywords

PHP email validation filter_var regular expressions prevent fake submissions

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