Refactored getModule and hasModule.

framework/yii/base/Module.php

@@ -326,39 +326,40 @@ abstract class Module extends Component
 	}
 
 	/**
-	 * Checks whether the named module exists.
-	 * @param string $id module ID
+	 * Checks whether the child module of the specified ID exists.
+	 * This method supports checking the existence of both child and grand child modules.
+	 * @param string $id module ID. For grand child modules, use ID path relative to this module (e.g. `admin/content`).
 	 * @return boolean whether the named module exists. Both loaded and unloaded modules
 	 * are considered.
 	 */
 	public function hasModule($id)
 	{
-		if (strpos($id, '/') === false) {
-			return isset($this->_modules[$id]);
+		if (($pos = strpos($id, '/')) !== false) {
+			// sub-module
+			$module = $this->getModule(substr($id, 0, $pos));
+			return $module === null ? false : $module->hasModule(substr($id, $pos + 1));
 		} else {
-			// it's a sub-module
-			$ids = explode('/', $id);
-			$module = $this;
-			foreach ($ids as $id) {
-				if (!isset($module->_modules[$id])) {
-					return false;
-				}
-				$module = $module->getModule($id);
-			}
-			return true;
+			return isset($this->_modules[$id]);
 		}
 	}
 
 	/**
-	 * Retrieves the named module.
-	 * @param string $id module ID (case-sensitive).
+	 * Retrieves the child module of the specified ID.
+	 * This method supports retrieving both child modules and grand child modules.
+	 * @param string $id module ID (case-sensitive). To retrieve grand child modules,
+	 * use ID path relative to this module (e.g. `admin/content`).
 	 * @param boolean $load whether to load the module if it is not yet loaded.
 	 * @return Module|null the module instance, null if the module does not exist.
 	 * @see hasModule()
 	 */
 	public function getModule($id, $load = true)
 	{
-		if (strpos($id, '/') === false) {
+		if (($pos = strpos($id, '/')) !== false) {
+			// sub-module
+			$module = $this->getModule(substr($id, 0, $pos));
+			return $module === null ? null : $module->getModule(substr($id, $pos + 1), $load);
+		}
+
 		if (isset($this->_modules[$id])) {
 			if ($this->_modules[$id] instanceof Module) {
 				return $this->_modules[$id];
@@ -367,15 +368,6 @@ abstract class Module extends Component
 				return $this->_modules[$id] = Yii::createObject($this->_modules[$id], $id, $this);
 			}
 		}
-		} else {
-			// it's a sub-module
-			$ids = explode('/', $id);
-			$module = $this;
-			foreach ($ids as $id) {
-				$module = $module->getModule($id);
-			}
-			return $module;
-		}
 		return null;
 	}