refactor(core): code updates and improvements - phpstan level 5

phpstan.neon

@@ -1,5 +1,5 @@
 parameters:
-  level: 4
+  level: 5
   reportUnmatchedIgnoredErrors: false
   bootstrapFiles:
     - src/flextype/defines.php
@@ -7,7 +7,5 @@ parameters:
     - src
   ignoreErrors:
     - '#Undefined variable: \$this.*#'
-    - '/Constant PATH not found./'
-    - '/Constant ROOT_DIR not found./'
     - '/Variable \$api_errors might not be defined./'
     - '/Variable \$registry might not be defined./'

src/flextype/core/Cache/Drivers/Phparray/Driver.php

@@ -72,12 +72,12 @@ class Driver implements AggregatablePoolInterface
     {
         $filePath = $this->getFilePath($item->getKey(), true) . '.' . 'php';
 
-        $value = null;
-
-        set_error_handler(static function () {});
+        // mute errors handling 
+        set_error_handler(fn(): bool => true);
 
         $value = include $filePath;
         
+        // restore errors handling
         restore_error_handler();
 
         return ! is_bool($value) ? $value : null;