The Interface Segregation Principle PHP code example

isp.php

<?php

interface Notifiable
{
    /**
     * Send notifications
     * 
     * @param array $data
     * @return void
     */
    public function notify(array $data): void;
}

class AbcEmailClient implements Notifiable 
{
    public function notify(array $data): void
    {
        var_dump('Sending emails with ', $data);
    }
}

class NotificationManager
{
    // Other methods and properties

    /**
     * @param array $data
     * @param Notifiable $notifier
     * @return void
     */
    public function notify(array $data, Notifiable $notifier): void
    {
        $notifier->notify($data);
    }
}

$abcEmail = new AbcEmailClient();

$data = [
    'some data',
    'more data',
];

// Notifies users via emails
$emailNotification = new NotificationManager();
$emailNotification->notify($data, $abcEmail);