Task: #53687 Support instance-specific cfg write targets and add coverage

src/SettingsWriter.php

@@ -22,6 +22,8 @@
 declare(strict_types=1);
 namespace rabe\Util;
 
+use ErrorException;
+
 /**
  * Write Settings into a File
  * @author Norbert.e.Wagner dev@norb.me
@@ -45,13 +47,16 @@ class SettingsWriter
 	 *
 	 * @param Settings $settings an object of type settings
 	 * @param String $name The name midfix for the settings File
-	 */
-	public function __construct( Settings $settings, $name='' )
+     * @param String|int|null $type Optional type for Settings::buildFileName(), e.g. site flag
+     */
+    public function __construct( Settings $settings, $name='', $type=null )
 	{
 		$this->settings = $settings;
-		
-		$file = $settings->buildFileName( $name );
-		
+
+        $file = ( $type === null )
+            ? $settings->buildFileName( $name )
+            : $settings->buildFileName( $type );
+
 		if ( ! $this->handle = fopen( $file, 'w' ) )
 		{
 			throw new ErrorException( "Can not open File: $file" );