wip

Author: michalsn

system/Config/BaseService.php

@@ -203,6 +203,18 @@ public static function get(string $key): ?object
         return static::$instances[$key] ?? static::__callStatic($key, []);
     }
 
+    /**
+     * Checks if a service instance has been created.
+     *
+     * @param string $key Identifier of the entry to check.
+     *
+     * @return bool True if the service instance exists, false otherwise.
+     */
+    public static function has(string $key): bool
+    {
+        return isset(static::$instances[$key]);
+    }
+
     /**
      * Sets an entry.
      *

user_guide_src/source/concepts/index.rst

@@ -14,4 +14,5 @@ The following pages describe the architectural concepts behind CodeIgniter4:
     factories
     http
     security
+    worker_mode
     goals