core-bundle/src/Resources/contao/classes/StyleSheets.php
public function updateStyleSheet($intId)
	{
		$objStyleSheet = $this->Database->prepare("SELECT * FROM tl_style_sheet WHERE id=?")
										->limit(1)
										->execute($intId);

		if ($objStyleSheet->numRows < 1)
		{
			return;
		}

		// Delete the CSS file
		if (Input::get('act') == 'delete')
		{
			$this->import(Files::class, 'Files');
			$this->Files->delete('assets/css/' . $objStyleSheet->name . '.css');
		}

		// Update the CSS file
		else
		{
			$this->writeStyleSheet($objStyleSheet->row());
			$this->log('Generated style sheet "' . $objStyleSheet->name . '.css"', __METHOD__, TL_CRON);
		}
	}
public function updateStyleSheet($intId)
	{
		$objStyleSheet = $this->Database->prepare("SELECT * FROM tl_style_sheet WHERE id=?")
										->limit(1)
										->execute($intId);

		if ($objStyleSheet->numRows < 1)
		{
			return;
		}

		// Delete the CSS file
		if (Input::get('act') == 'delete')
		{
			$this->import(Files::class, 'Files');
			$this->Files->delete('assets/css/' . $objStyleSheet->name . '.css');
		}

		// Update the CSS file
		else
		{
			$this->writeStyleSheet($objStyleSheet->row());
			$this->log('Generated style sheet "' . $objStyleSheet->name . '.css"', __METHOD__, TL_CRON);
		}
	}
Update a particular style sheet

@param integer $intId