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   	 *		// Start injecting into the "header" section	 *		Section::start('header');	 *	 *		// Inject a raw string into the "header" section without buffering	 *		Section::start('header', '');	 * 	 *	 * @param  string          $section	 * @param  string|Closure  $content	 * @return void	 */	public static function start($section, $content = '')	{		if ($content === '') ob_start() and static::$last[] = $section;		static::append($section, $content);	}	/**	 * Inject inline content into a section.	 * 将内联内容注入一个部分。	 * This is helpful for injecting simple strings such as page titles.	 * 这有助于注入简单的字符串，例如页面标题。	 * 	 *		// Inject inline content into the "header" section	 *		Section::inject('header', '');	 * 	 *	 * @param  string  $section	 * @param  string  $content	 * @return void	 */	public static function inject($section, $content)	{		static::start($section, $content);	}	/**	 * Stop injecting content into a section.	 * 停止将内容注入部分。	 * @return void	 */	public static function stop()	{	    // array_pop-弹出数组最后一个单元 ob_get_clean-得到当前缓冲区的内容并删除当前输出缓。		static::append(array_pop(static::$last), ob_get_clean());	}	/**	 * Append content to a given section.	 * 将内容附加到给定部分。	 * @param  string  $section	 * @param  string  $content	 * @return void	 */	protected static function append($section, $content)	{		if (isset(static::$sections[$section]))		{			$content = static::$sections[$section].PHP_EOL.$content;		}		static::$sections[$section] = $content;	}	/**	 * Get the string contents of a section.	 * 获取节的字符串内容。	 * @param  string  $section	 * @return string	 */	public static function yield($section)	{		return (isset(static::$sections[$section])) ? static::$sections[$section] : '';	}}

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