yii压缩

 application\components\controller.php

 protected function afterRender($view, &$output)

 {

 if(Yii::app()->params['compress_on']){

 Yii::import('ext.Compress', true);

 $output = Compress::minify($output, array('xhtml' => true));

 }

 }

extension\Compress.php

<?php

/**

 * Class Compress

 * @package Minify

 */

/**

 * Compress HTML

 *

 * This is a heavy regex-based removal of whitespace, unnecessary comments and

 * tokens. IE conditional comments are preserved. There are also options to have

 * STYLE and SCRIPT blocks compressed by callback functions.

 *

 * A test suite is available.

 *

 * @package Minify

 * @author Stephen Clay <steve@mrclay.org>

 */

class Compress {

    /**

     * @var boolean

     */

    protected $_jsCleanComments = true;

    /**

     * "Minify" an HTML page

     *

     * @param string $html

     *

     * @param array $options

     *

     * 'cssMinifier' : (optional) callback function to process content of STYLE

     * elements.

     *

     * 'jsMinifier' : (optional) callback function to process content of SCRIPT

     * elements. Note: the type attribute is ignored.

     *

     * 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If

     * unset, minify will sniff for an XHTML doctype.

     *

     * @return string

     */

    public static function minify($html, $options = array()) {

        $min = new self($html, $options);

        return $min->process();

    }

    /**

     * Create a minifier object

     *

     * @param string $html

     *

     * @param array $options

     *

     * 'cssMinifier' : (optional) callback function to process content of STYLE

     * elements.

     *

     * 'jsMinifier' : (optional) callback function to process content of SCRIPT

     * elements. Note: the type attribute is ignored.

     *

     * 'jsCleanComments' : (optional) whether to remove HTML comments beginning and end of script block

     *

     * 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If

     * unset, minify will sniff for an XHTML doctype.

     *

     * @return null

     */

    public function __construct($html, $options = array())

    {

        $this->_html = str_replace("\r\n", "\n", trim($html));

        if (isset($options['xhtml'])) {

            $this->_isXhtml = (bool)$options['xhtml'];

        }

        if (isset($options['cssMinifier'])) {

            $this->_cssMinifier = $options['cssMinifier'];

        }

        if (isset($options['jsMinifier'])) {

            $this->_jsMinifier = $options['jsMinifier'];

        }

        if (isset($options['jsCleanComments'])) {

            $this->_jsCleanComments = (bool)$options['jsCleanComments'];

        }

    }

    /**

     * Minify the markeup given in the constructor

     *

     * @return string

     */

    public function process()

    {

        if ($this->_isXhtml === null) {

            $this->_isXhtml = (false !== strpos($this->_html, '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML'));

        }

        $this->_replacementHash = 'MINIFYHTML' . md5($_SERVER['REQUEST_TIME']);

        $this->_placeholders = array();

        // replace SCRIPTs (and minify) with placeholders

        /*

            $this->_html = preg_replace_callback(

            '/(\\s*)<script(\\b[^>]*?>)([\\s\\S]*?)<\\/script>(\\s*)/i'

            ,array($this, '_removeScriptCB')

            ,$this->_html);

        */

        // replace STYLEs (and minify) with placeholders

        $this->_html = preg_replace_callback(

            '/\\s*<style(\\b[^>]*>)([\\s\\S]*?)<\\/style>\\s*/i'

            ,array($this, '_removeStyleCB')

            ,$this->_html);

        // remove HTML comments (not containing IE conditional comments).

        $this->_html = preg_replace_callback(

            '/<!--([\\s\\S]*?)-->/'

            ,array($this, '_commentCB')

            ,$this->_html);

        // replace PREs with placeholders

        $this->_html = preg_replace_callback('/\\s*<pre(\\b[^>]*?>[\\s\\S]*?<\\/pre>)\\s*/i'

            ,array($this, '_removePreCB')

            ,$this->_html);

        // replace TEXTAREAs with placeholders

        $this->_html = preg_replace_callback(

            '/\\s*<textarea(\\b[^>]*?>[\\s\\S]*?<\\/textarea>)\\s*/i'

            ,array($this, '_removeTextareaCB')

            ,$this->_html);

        // trim each line.

        // @todo take into account attribute values that span multiple lines.

        $this->_html = preg_replace('/^\\s+|\\s+$/m', '', $this->_html);

        // remove ws around block/undisplayed elements

        $this->_html = preg_replace('/\\s+(<\\/?(?:area|base(?:font)?|blockquote|body'

            .'|caption|center|cite|col(?:group)?|dd|dir|div|dl|dt|fieldset|form'

            .'|frame(?:set)?|h[1-6]|head|hr|html|legend|li|link|map|menu|meta'

            .'|ol|opt(?:group|ion)|p|param|t(?:able|body|head|d|h||r|foot|itle)'

            .'|ul)\\b[^>]*>)/i', '$1', $this->_html);

        // remove ws outside of all elements

        $this->_html = preg_replace(

            '/>(\\s(?:\\s*))?([^<]+)(\\s(?:\s*))?</'

            ,'>$1$2$3<'

            ,$this->_html);

        // use newlines before 1st attribute in open tags (to limit line lengths)

        $this->_html = preg_replace('/(<[a-z\\-]+)\\s+([^>]+>)/i', "$1 $2", $this->_html);

        //过滤两个标签之间的换行和空格

        $pat = array('#(</[a-z]+>)\n+<#', '#>\s+<#');

        $this->_html = preg_replace($pat, array("$1<", "><"), $this->_html);

        // fill placeholders

        $this->_html = str_replace(

            array_keys($this->_placeholders)

            ,array_values($this->_placeholders)

            ,$this->_html

        );

        // issue 229: multi-pass to catch scripts that didn't get replaced in textareas

        $this->_html = str_replace(

            array_keys($this->_placeholders)

            ,array_values($this->_placeholders)

            ,$this->_html

        );

        return $this->_html;

    }

    protected function _commentCB($m)

    {

        return (0 === strpos($m[1], '[') || false !== strpos($m[1], '<!['))

            ? $m[0]

            : '';

    }

    protected function _reservePlace($content)

    {

        $placeholder = '%' . $this->_replacementHash . count($this->_placeholders) . '%';

        $this->_placeholders[$placeholder] = $content;

        return $placeholder;

    }

    protected $_isXhtml = null;

    protected $_replacementHash = null;

    protected $_placeholders = array();

    protected $_cssMinifier = null;

    protected $_jsMinifier = null;

    protected function _removePreCB($m)

    {

        return $this->_reservePlace("<pre{$m[1]}");

    }

    protected function _removeTextareaCB($m)

    {

        return $this->_reservePlace("<textarea{$m[1]}");

    }

    protected function _removeStyleCB($m)

    {

        $openStyle = "<style{$m[1]}";

        $css = $m[2];

        // remove HTML comments

        $css = preg_replace('/(?:^\\s*<!--|-->\\s*$)/', '', $css);

        // remove CDATA section markers

        $css = $this->_removeCdata($css);

        // minify

        $minifier = $this->_cssMinifier

            ? $this->_cssMinifier

            : 'trim';

        $css = call_user_func($minifier, $css);

        return $this->_reservePlace($this->_needsCdata($css)

            ? "{$openStyle}/*<![CDATA[*/{$css}/*]]>*/</style>"

            : "{$openStyle}{$css}</style>"

        );

    }

    protected function _removeScriptCB($m)

    {

        $openScript = "<script{$m[2]}";

        $js = $m[3];

        // whitespace surrounding? preserve at least one space

        $ws1 = ($m[1] === '') ? '' : ' ';

        $ws2 = ($m[4] === '') ? '' : ' ';

        // remove HTML comments (and ending "//" if present)

        if ($this->_jsCleanComments) {

            $js = preg_replace('/(?:^\\s*<!--\\s*|\\s*(?:\\/\\/)?\\s*-->\\s*$)/', '', $js);

        }

        // remove CDATA section markers

        $js = $this->_removeCdata($js);

        // minify

        $minifier = $this->_jsMinifier

            ? $this->_jsMinifier

            : 'trim';

        $js = call_user_func($minifier, $js);

        return $this->_reservePlace($this->_needsCdata($js)

            ? "{$ws1}{$openScript}/*<![CDATA[*/{$js}/*]]>*/</script>{$ws2}"

            : "{$ws1}{$openScript}{$js}</script>{$ws2}"

        );

    }

    protected function _removeCdata($str)

    {

        return (false !== strpos($str, '<![CDATA['))

            ? str_replace(array('<![CDATA[', ']]>'), '', $str)

            : $str;

    }

    protected function _needsCdata($str)

    {

        return ($this->_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str));

    }

}

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