Basic signup for events

app/ValueObjects/Age.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\ValueObjects;
+
+class Age {
+    function __construct(private \DateTime $birthday) {
+    }
+
+    public function getAge() : int {
+        return (new \DateTime())->diff($this->birthday)->y;
+    }
+
+    public function isfullAged() : bool {
+        return $this->getAge() >= 18;
+    }
+}

app/ValueObjects/Amount.php

@@ -45,6 +45,11 @@ class Amount {
         $this->amount -= $amount->getAmount();
     }
 
+    public function multiply(float $factor) : Amount {
+        $this->amount *= $factor;
+        return $this;
+    }
+
     public function getFormattedAmount() : string {
         $value = number_format( round( $this->amount, 2 ), 2, ',', '.' );
         return $value