liyaoyu
/
pfhwyigou


			
				
					
						
						
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							<?php
/**

 * @link http://www.yiiframework.com/

 * @copyright Copyright (c) 2008 Yii Software LLC

 * @license http://www.yiiframework.com/license/

 */

namespace yii\widgets;

use yii\base\Widget;

/**

 * Spaceless widget removes whitespace characters between HTML tags. Whitespaces within HTML tags

 * or in a plain text are always left untouched.

 *

 * Usage example:

 *

 * ```php

 * <body>

 *     <?php Spaceless::begin(); ?>

 *         <div class="nav-bar">

 *             <!-- tags -->

 *         </div>

 *         <div class="content">

 *             <!-- tags -->

 *         </div>

 *     <?php Spaceless::end(); ?>

 * </body>

 * ```

 *

 * This example will generate the following HTML:

 *

 * ```html

 * <body>

 *     <div class="nav-bar"><!-- tags --></div><div class="content"><!-- tags --></div></body>

 * ```

 *

 * This method is not designed for content compression (you should use `gzip` output compression to

 * achieve it). Main intention is to strip out extra whitespace characters between HTML tags in order

 * to avoid browser rendering quirks in some circumstances (e.g. newlines between inline-block elements).

 *

 * Note, never use this method with `pre` or `textarea` tags. It's not that trivial to deal with such tags

 * as it may seem at first sight. For this case you should consider using

 * [HTML Tidy Project](http://tidy.sourceforge.net/) instead.

 *

 * @see http://tidy.sourceforge.net/

 * @author resurtm <resurtm@gmail.com>

 * @since 2.0

 */
class Spaceless extends Widget

{
    /**

     * Starts capturing an output to be cleaned from whitespace characters between HTML tags.

     */
    public function init()

    {
        parent::init();
        ob_start();
        ob_implicit_flush(false);
    }

    /**

     * Marks the end of content to be cleaned from whitespace characters between HTML tags.

     * Stops capturing an output and echoes cleaned result.

     */
    public function run()

    {
        echo trim(preg_replace('/>\s+</', '><', ob_get_clean()));
    }
}