PHP code example of fasano / phprimitives

1. Go to this page and download the library: Download fasano/phprimitives library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php. 
    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

fasano / phprimitives example snippets


readonly class Email extends AbstractString
{
    protected static function validate(string $value): void
    {
        if (!filter_var($value, FILTER_VALIDATE_EMAIL)) {
            throw new InvalidArgumentException('Invalid email address: ' . $value);
        }
    }
}


# Input boundary - scalar to primitive
$age = new Age($request->input('age'));           # Throws if invalid
$email = new Email($request->input('email'));     # Throws if invalid


# Everywhere else - work with primitives
function createUser(Email $email, Age $age): User
{
    # Type system guarantees correctness
    # No defensive checks 

# Output boundary - primitive to scalar
$repository->save([
    'email' => $email->value,
    'age' => $age->value,
]);


function createUser(string $email, int $age): void
{
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { /* ... */ }
    if ($age < 0 || 120 < $age) { /* ... */ }
    # Repeat in every function that touches these values
}


echo json_encode(new Person(
    new Name('John'),
    new Age(18),
    new Email('[email protected]'),
));
// {"name":"John","age":18,"email":"[email protected]"}