从输出缓冲区重写 PHP URL

我正在尝试使用输出缓冲区在PHP中重写我的URL。理想情况下，在我的源代码中是这样，我可以将链接保留为example.com/index.php?action=123;sa=456;sa2=789但是当输出到浏览器时，它会重写为example.com/123/456/789 它似乎正在工作，但是当它到达"sa2"重写时，输出缓冲区往往会偶尔中断，浏览器看到的只是一个空白的白页。当页面加载时，它会使用 gzip 启动输出缓冲区，然后启动带有重写回调的输出缓冲区。这是我的php/.htaccess

<?php
if (!ob_start("ob_gzhandler"))
    ob_start();
// Handle Rewriting of URLs
RewriteURLs();
function RewriteURLs()
{
// rewrite URLS from output buffer
function rewrite($buffer)
{
    // pages
    $buffer = preg_replace('/index.php'?page=(.*?)/is', "page/$1", $buffer);
    // sub-sub-actions
    $buffer = preg_replace('/index.php'?action=(.*?);sa=(.*?);sa2=(.*?)/is', "$1/$2/$3", $buffer);
    // sub-actions
    $buffer = preg_replace('/index.php'?action=(.*?);sa=(.*?)/is', "$1/$2", $buffer);
    // actions
    $buffer = preg_replace('/index.php'?action=(.*?)/is', "$1", $buffer);
    // index.php removal
    $buffer = preg_replace('/index.php/is', "", $buffer);
    return $buffer;
}
// start for rewriting
ob_start('rewrite');
}
// rest of content/page loading.......
?>

.htaccess 处理重写

Options +FollowSymLinks  
RewriteEngine on  
RewriteBase   /
# Rules for: pages
RewriteRule ^page/([-_!~*'()$'w]+)/?$  index.php?page=$1    [L,QSA]
# Rules for sub-sub-actions
# /{action}/{subaction}/{subsubaction}/
RewriteRule ^([-_!~*'()$'w]+)/([-_!~*'()$'w]+)/([-_!~*'()$'w]+)/?$ index.php?action=$1;sa=$2;sa2=$3
# Rules for sub-actions
# /{action}/{subaction}/
RewriteRule ^([-_!~*'()$'w]+)/([-_!~*'()$'w]+)/?$ index.php?action=$1;sa=$2
# Rules for: actions
# /{action}/
RewriteRule ^([-_!~*'()$'w]+)/?$  index.php?action=$1    [L,QSA]

这看起来越来越像一个PHP输出缓冲区问题，我似乎找不到我做错了什么。任何帮助将不胜感激。