Allow to save unset and default values

src/main/php/com/selfcoders/jsonconfig/Config.php

@@ -65,8 +65,9 @@ public function load($configFile = null)
 	 *
 	 * @param null|string $configFile An optional path to a JSON file to which the data should be written instead of the $configFile defined on instance creation
 	 * @param int $jsonOptions Optional options passed to json_encode (e.g. JSON_PRETTY_PRINT)
+	 * @param bool $saveUnset Whether to also write unset and default values
 	 */
-	public function save($configFile = null, $jsonOptions = 0)
+	public function save($configFile = null, $jsonOptions = 0, $saveUnset = false)
 	{
 		if ($configFile == null)
 		{
@@ -81,8 +82,16 @@ public function save($configFile = null, $jsonOptions = 0)
 			{
 				ValueByPath::setValueByPath($data, $name, $itemData->value, true);
 			}
+			elseif ($saveUnset and isset($itemData->defaultValue))
+			{
+				ValueByPath::setValueByPath($data, $name, $itemData->defaultValue, true);
+			}
+			elseif ($saveUnset)
+			{
+				ValueByPath::setValueByPath($data, $name, null, true);
+			}
 
-			if (isset($itemData->value) and isset($itemData->defaultValue) and $itemData->value == $itemData->defaultValue)
+			if (!$saveUnset and isset($itemData->value) and isset($itemData->defaultValue) and $itemData->value == $itemData->defaultValue)
 			{
 				ValueByPath::removeValueByPath($data, $name);
 			}

src/test/php/ConfigTest.php

@@ -117,4 +117,17 @@ public function testIsValueSet()
 		$this->assertTrue($this->config->isValueSet("path.to.my.otherValue"));
 		$this->assertFalse($this->config->isValueSet("path.to.unset.value"));
 	}
+
+	public function testSaveUnset()
+	{
+		$filename = tempnam(sys_get_temp_dir(), "cfg");
+
+		$this->config->save($filename, 0, true);
+		$json = json_decode(file_get_contents($filename));
+
+		$this->assertEquals("Set by template", $json->path->to->my->defaultValue);
+		$this->assertNull($json->path->to->unset->value);
+
+		unlink($filename);
+	}
 }