PHP7.2+ compatible strict types and type hinting

php/src/Invoice.php

@@ -1,16 +1,24 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Theatrical;
 
 class Invoice
 {
-    public string $customer;
-    public array $performances;
+    /**
+     * @var string
+     */
+    public $customer;
 
-    public function __construct($customer, $performances)
+    /**
+     * @var array
+     */
+    public $performances;
+
+    public function __construct(string $customer, array $performances)
     {
         $this->customer = $customer;
         $this->performances = $performances;
     }
-    
 }

php/src/Performance.php

@@ -1,13 +1,27 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Theatrical;
 
 class Performance
 {
-    public string $play_id;
-    public int $audience;
+    /**
+     * @var string
+     */
+    public $play_id;
 
-    public function __construct($play_id, $audience)
+    /**
+     * @var int
+     */
+    public $audience;
+
+    /**
+     * @var Play
+     */
+    public $play;
+
+    public function __construct(string $play_id, int $audience)
     {
         $this->play_id = $play_id;
         $this->audience = $audience;

php/src/Play.php

@@ -1,13 +1,22 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Theatrical;
 
 class Play
 {
-    public string $name;
-    public string $type;
+    /**
+     * @var string
+     */
+    public $name;
 
-    public function __construct($name, $type)
+    /**
+     * @var string
+     */
+    public $type;
+
+    public function __construct(string $name, string $type)
     {
         $this->name = $name;
         $this->type = $type;