code improvements

src/Examples/test1.php

@@ -28,7 +28,7 @@
 		->attr('td', 'data-text', 'bla bla bla')
 		->css('th', 'color', 'green')
 		->css('td', 'width', '50%')
-		->css('td', 'background-color', '#ccc', true)
+		->css('td', 'background-color', '#ccc')
 	->add()
 	->column()
 		->title('Age')

src/Examples/test2.php

@@ -25,7 +25,7 @@
 		->filter($filterData)
 		->css('td', 'color', 'green')
 		->css('td', 'width', '50%')
-		->css('td', 'background-color', '#ccc', true)
+		->css('td', 'background-color', '#ccc')
 	->add()
 	->column()
 		->title('Age')

src/Table/Table.php

@@ -40,7 +40,7 @@ public static function instance()
 	 */
 	public function setData($data)
 	{
-		$this->data = $this->isJson($data) ? json_decode($data) : $data;
+		$this->data = self::isJson($data) ? json_decode($data) : $data;
 
 		return $this;
 	}
@@ -170,7 +170,7 @@ public function render($returnOutput = false)
 	}
 
 
-	private function isJson($string)
+	public static function isJson($string)
 	{
 		if (!is_string($string)) return false;
 		json_decode($string);

src/Table/TableColumn.php

@@ -97,7 +97,7 @@ public function css($elem, $attr, $value)
 	 */
 	public function filter($data = null)
 	{
-		$this->filterData = $this->isJson($data) ? json_decode($data) : $data;
+		$this->filterData = Table::isJson($data) ? json_decode($data) : $data;
 		$this->filter = true;
 		$this->tableInstance->hasFilters = true;
 
@@ -193,21 +193,6 @@ public function renderBody( &$row )
 	}
 
 
-	/**
-	 * Check if string if json
-	 *
-	 * @param $string
-	 * @return bool
-	 */
-	private function isJson($string)
-	{
-		if (!is_string($string)) return false;
-		json_decode($string);
-
-		return (json_last_error() == JSON_ERROR_NONE);
-	}
-
-
 	/**
 	 * @param string $str
 	 * @return mixed