From 6fcf410891c8d33fe81d815a2dcd4597f23aee9e Mon Sep 17 00:00:00 2001
From: Risad212 <hafez.risad@gmail.com>
Date: Fri, 1 Nov 2024 12:23:14 +0600
Subject: [PATCH] add new dependenxy inversion code

---
 5-dependency-inversion-principle.php | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/5-dependency-inversion-principle.php b/5-dependency-inversion-principle.php
index 2ea7db2..853b957 100644
--- a/5-dependency-inversion-principle.php
+++ b/5-dependency-inversion-principle.php
@@ -21,22 +21,25 @@ interface Mailer
     public function send();
 }
 
+// Concrete implementation of Mailer using SMTP
 class SmtpMailer implements Mailer
 {
     public function send()
     {
-
+        echo 'send message from SMTP mailer';
     }
 }
 
+// Concrete implementation of Mailer using SendGrid
 class SendGridMailer implements Mailer
 {
     public function send()
     {
-
+        echo 'send message from SendGrid mailer';
     }
 }
 
+// High-level module that depends on the Mailer abstraction
 class SendWelcomeMessage
 {
     private $mailer;
@@ -45,4 +48,18 @@ public function __construct(Mailer $mailer)
     {
         $this->mailer = $mailer;
     }
+
+    public function sendWelcome()
+    {
+        $this->mailer->send();
+    }
 }
+
+// Usage example
+$smtpMailer = new SmtpMailer();
+$welcomeMessage = new SendWelcomeMessage($smtpMailer);
+$welcomeMessage->sendWelcome(); // Outputs: send message from SMTP mailer
+
+$sendGridMailer = new SendGridMailer();
+$welcomeMessage = new SendWelcomeMessage($sendGridMailer);
+$welcomeMessage->sendWelcome(); // Outputs: send message from SendGrid mailer
\ No newline at end of file