Add a validator interface, UpperRangeValidator and OkValidator.

app/Models/Validation/Validators/OkValidator.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Models\Validation\Validators;
+
+use App\Models\Validation\Validators\ValidationInterface;
+
+class OkValidator implements ValidationInterface {
+    public function isValid(): bool
+    {
+        return true;
+    }
+}
+

app/Models/Validation/Validators/UpperRangeValidator.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Models\Validation\Validators;
+
+use App\Models\Validation\Validators\ValidationInterface;
+use App\Models\Validation\Validators\ValidationTrait;
+
+class UpperRangeValidator implements ValidationInterface {
+    private ValidationInterface $nextValidator;
+    private int $value;
+    private int $rangeLimit;
+
+    public function __construct(int $value, int $rangeLimit, ValidationInterface $nextValidator)
+    {
+        $this->value = $value;
+        $this->rangeLimit = $rangeLimit;
+        $this->nextValidator = $nextValidator;
+    }
+
+    public function isCurrentValid(): bool
+    {
+        if($this->value > $this->rangeLimit)
+            return false;
+
+        return true;
+    }
+
+    public function isValid(): bool
+    {
+        return $this->isCurrentValid() && $this->nextValidator->isValid();
+    }
+}
+

app/Models/Validation/Validators/ValidationInterface.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace App\Models\Validation\Validators;
+
+interface ValidationInterface {
+    public function isValid(): bool;
+}
+