The "protected" keyword should be used in order to subclasses to use that property. Otherwise, saying "$this->text = $text" is not making sense for extender objects.

Kerem Güneş · Kerem Güneş · commit bfe62d5f1a9d · 2017-12-09T21:21:37.000+03:00
diff --git a/Creational/AbstractFactory/Text.php b/Creational/AbstractFactory/Text.php
@@ -7,7 +7,7 @@ abstract class Text
     /**
      * @var string
      */
-    private $text;
+    protected $text;
 
     public function __construct(string $text)
     {

Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,7 @@ abstract class Text`
`7`	`7`	`/**`
`8`	`8`	`* @var string`
`9`	`9`	`*/`
`10`		`- private $text;`
	`10`	`+ protected $text;`
`11`	`11`
`12`	`12`	`public function __construct(string $text)`
`13`	`13`	`{`