: Often described as "handshakes," interfaces define a contract that a class must adhere to without providing the actual behavior itself.
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// Violation: Depends on a concrete class (Mailgun) $mailer = new MailgunMailer(); $mailer->send('welcome@site.com'); : Often described as "handshakes," interfaces define a
* Object-Oriented Principles in PHP. * From Getters and Setters to Property Hooks. Object-Oriented Principles in PHP - Laracasts : Often described as "handshakes