phpwind的rewrite重写原理

RewriteRule ^(.*)-htm-(.*)$ $1.php?$2

<?php
$db_obstart == 1 ? ob_start('ob_gzhandler') : ob_start();
?>

<?php
function footer(){
global $db,$db_obstart,$db_footertime,$db_htmifopen,$P_S_T,$mtablewidth,$db_ceoconnect,$wind_version,$imgpath,$stylepath,$footer_ad,$db_union,$dbinfo,$timestamp;
Update_ol();
if($db){
$qn=$db->query_num;
}
$ft_gzip=($db_obstart==1 ? "Gzip enabled" : "Gzip disabled").$db_union[3];
if ($db_footertime == 1){
$t_array = explode(' ',microtime());
$totaltime = number_format(($t_array[0]+$t_array[1]-$P_S_T),6);
$wind_spend = "Total $totaltime(s) query $qn,";
}
$ft_time=get_date($timestamp,'m-d H:i');
include PrintEot('footer');
$output = str_replace(array('<!--<!---->','<!---->'),array('',''),ob_get_contents());
if($db_htmifopen){
$output = preg_replace(
"/<a(s*[^>]+s*)href=(["|']?)([^"'>s]+.php?[^"'>s]+)(["|']?)/ies",
"Htm_cv('3','<a1href="')",
$output
);
}
ob_end_clean();
$db_obstart == 1 ? ob_start('ob_gzhandler') : ob_start();
echo $output;
flush;
exit;
}
?>

function parseHtmlUrlRewrite($html, $flag) {
return $flag ? preg_replace("/\<a(\s*[^\>]+\s*)href\=([\"|\']?)((index|cate|thread|read|faq|rss)\.php\?[^\"\'>\s]+\s?)[\"|\']?/ies", "Htm_cv('\\3','<a\\1href=\"')", $html) : $html;
}</p> <p>/**
* url处理
*
* @param string $url
* @param string $tag
* @return string
*/
function Htm_cv($url, $tag) {
return stripslashes($tag) . urlRewrite($url) . '"';
}</p> <p>function urlRewrite($url) {
global $db_htmifopen, $db_dir, $db_ext;
if (!$db_htmifopen) return $url;
$tmppos = strpos($url, '#');
$add = $tmppos !== false ? substr($url, $tmppos) : '';
$turl = str_replace(array('.php?', '=', '&amp;', '&', $add), array($db_dir, '-', '-', '-', ''), $url);//pw的重写规则在这里进行字符的替换
$turl != $url && $turl .= $db_ext;
return $turl . $add;
}