Signup for events implemented

app/Providers/DoubleCheckEventRegistrationProvider.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Providers;
+
+use App\Models\Event;
+use DateTime;
+
+class DoubleCheckEventRegistrationProvider {
+    function __construct(
+        private Event $event,
+        private string $firstname,
+        private string $lastname,
+        private string $email,
+        private DateTime $birthday,
+
+    ) {}
+
+    public function isRegistered() : bool
+    {
+        $checkconditions = array(
+            'firstname' => $this->firstname,
+            'lastname'  => $this->lastname,
+            'email_1'   => $this->email,
+            'birthday'  => $this->birthday->format('Y-m-d'),
+        );
+
+
+        return $this->event->participants()->where($checkconditions)->exists();
+    }
+}