Fixes #4919

framework/behaviors/BlameableBehavior.php

@@ -54,12 +54,12 @@ class BlameableBehavior extends AttributeBehavior
 {
     /**
      * @var string the attribute that will receive current user ID value
-     * Set this property to be null if you do not want to record the creator ID.
+     * Set this property to false if you do not want to record the creator ID.
      */
     public $createdByAttribute = 'created_by';
     /**
      * @var string the attribute that will receive current user ID value
-     * Set this property to be null if you do not want to record the updater ID.
+     * Set this property to false if you do not want to record the updater ID.
      */
     public $updatedByAttribute = 'updated_by';
     /**

framework/behaviors/TimestampBehavior.php

@@ -64,12 +64,12 @@ class TimestampBehavior extends AttributeBehavior
 {
     /**
      * @var string the attribute that will receive timestamp value
-     * Set this property to be null if you do not want to record the creation time.
+     * Set this property to false if you do not want to record the creation time.
      */
     public $createdAtAttribute = 'created_at';
     /**
      * @var string the attribute that will receive timestamp value.
-     * Set this property to be null if you do not want to record the update time.
+     * Set this property to false if you do not want to record the update time.
      */
     public $updatedAtAttribute = 'updated_at';
     /**

framework/web/UrlManager.php

@@ -117,7 +117,7 @@ class UrlManager extends Component
      *
      * After the UrlManager object is created, if you want to change this property,
      * you should only assign it with a cache object.
-     * Set this property to null if you do not want to cache the URL rules.
+     * Set this property to false if you do not want to cache the URL rules.
      */
     public $cache = 'cache';
     /**