protected function cssPipeline()
	{
		// If a custom minifier has been set use it, otherwise fallback to default
		$minifier = (isset($this->css_minifier)) ? $this->css_minifier : function ($buffer) {
			$min = new \CSSmin();
			return $min->run($buffer);
		};

		return $this->pipeline($this->css, '.css', $this->css_dir, $minifier);
	}
protected function cssPipeline()
	{
		// If a custom minifier has been set use it, otherwise fallback to default
		$minifier = (isset($this->css_minifier)) ? $this->css_minifier : function ($buffer) {
			$min = new \CSSmin();
			return $min->run($buffer);
		};

		return $this->pipeline($this->css, '.css', $this->css_dir, $minifier);
	}
protected function cssPipeline ( ) { // If a custom minifier has been set use it, otherwise fallback to default $ minifier = ( isset ( $ this -> css_minifier ) ) ? $ this -> css_minifier : function ( $ buffer ) { $ min = new \ CSSmin ( ) ; return $ min -> run ( $ buffer ) ; } ; return $ this -> pipeline ( $ this -> css , '.css' , $ this -> css_dir , $ minifier ) ; }
Minifiy and concatenate CSS files.

@return string
Minifiy and concatenate CSS files .