Are there any built-in PHP functions or libraries that can assist in validating form data for specific criteria, such as phone numbers or email addresses?

When validating form data in PHP, you can utilize built-in functions like `filter_var()` and `preg_match()` to validate specific criteria such as phone numbers or email addresses. These functions provide a convenient way to check if the input data meets the required format. 

// Validate email address
$email = "example@example.com";
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Email is valid";
} else {
    echo "Email is not valid";
}

// Validate phone number
$phone = "123-456-7890";
if (preg_match("/^\d{3}-\d{3}-\d{4}$/", $phone)) {
    echo "Phone number is valid";
} else {
    echo "Phone number is not valid";
}

Keywords

PHP form validation built-in functions phone numbers email addresses

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