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php中if的一个小问题

时间：2011-11-28
来源：互联网
PHP code
<?php
/*
Discuz X2 modified By Marshal,2011-07-08
本插件支持X2版伪静态切换，并支持不开启伪静态
www.modchina.com Marshal版权所有

require './source/class/class_core.php';
$discuz=& discuz_core::instance();
$discuz->init();
*/
if(!defined('IN_DISCUZ')) 
{
    exit('Access Denied');
}
/*
    门户专题页        topic-{name}.html
    门户文章页        article-{id}-{page}.html
    论坛主题列表页    forum-{fid}-{page}.html
    论坛主题内容页    thread-{tid}-{page}-{prevpage}.html
    群组主题列表页    group-{fid}-{page}.html
    用户个人主页      space-{user}-{value}.html
    用户日志内容页    blog-{uid}-{blogid}.html
    论坛 Archiver 页  {action}-{value}.html
 */
//只提取定义的数量条记录,设为0表示全部提取
$open=1;
$froum=1000;   //生产多少论坛主题列表页 
$article=1000; //生成多少门户文章页
$thread=20000; //生成多少论坛帖子 
$blog=1000;    //生成多少用户日志内容页
$space=1000;   //生成多少用户个人主页
$cat="";       //生成在什么目录，例如 data/ 结尾需加"/"，留空则生成在根目录
function rewriteurl($url,$id,$ex="")
{    
    global $open;
    if ( $open == 1 )//伪静态
    {
        if($url=="portal_article") {$mod="article-".$id."-1.html";}
        elseif($url=="forum_forumdisplay") {$mod="forum-".$id."-1.html";}
        elseif($url=="forum_viewthread") {$mod="thread-".$id."-1-1.html";}
        elseif($url=="home_blog") {$mod="blog-".$id."-".$ex.".html";}
        elseif($url=="common_member") {$mod="space-".$id."-1.html";}
     }
    else
    {
        if($url=="portal_article"){$mod="portal.php?mod=view&aid=".$id."";}
        elseif($url=="forum_forumdisplay"){$mod="forum.php?mod=forumdisplay&fid=".$id."";}
        elseif($url=="forum_viewthread"){$mod="forum.php?mod=viewthread&tid=".$id."";}
        elseif($url=="home_blog"){$mod="home.php?mod=space&uid=".$id."&do=blog&id=".$ex."";}
        elseif($url=="common_member") {$mod="home.php?mod=space&uid=".$id."";}
    }
    return $mod;
}

function Domain($root)//portal,forum,home,default
{    
    global $_G,$discuz;
    $marshal=$_G['setting']['domain']['app'];
    if(!isset($root) || !isset($marshal) || empty($marshal['default']))
    {$domain=$_G['siteurl'];}
    elseif(!empty($marshal['default']) && empty($marshal[$root]))
    {$domain='http://'.$marshal['default'].'/';}
    else
    {$domain='http://'.$marshal[$root].'/';}
    return $domain;
}
class sitemap_xml
{
    var $xml=array('');
    var $site;
    var $index=0;
    var $sitemap_file='sitemap';
    var $size;
    function sitemap_xml($sitemap_file='sitemap',$site='baidu')
    {
        $this->site=$site;
        $this->sitemap_file=$sitemap_file;
        $this->size=($site=='baidu')?1024*10240:1024*10240;
    }
    //替换loc特殊字符
    function replacestr($str)
    {
        $str=str_replace("&","&amp;",$str);
        $str=str_replace("'","&apos;",$str);
        $str=str_replace("\"","&quot;",$str);
        $str=str_replace(">","&gt;",$str);
        $str=str_replace("<","&lt;",$str);
        return $str;
    }
    /*
     * @param string $loc  页面永久链接地址
     * @param date $lastmod  页面最后修改时间，ISO 8601中指定的时间格式进行描述
     * @param string $changefreq  页面内容更新频率。这里可以用来描述的单词共这几个："always", "hourly", "daily", "weekly", "monthly", "yearly"
     * @param string $priority 是用来指定此链接相对于其他链接的优先权比值。此值定于0.0 - 1.0之间
     */
    function add_url($loc,$lastmod,$changefreq,$priority)
    {
        static $size=0;
        $size=($size==0)?$this->size:$size;
        $str="<url><loc>".$this->replacestr($loc)."</loc><lastmod>$lastmod</lastmod><changefreq>$changefreq</changefreq><priority>$priority</priority></url>";
        $this->xml[$this->index].=$str;
        $size-=strlen($str);
        if($size<10240) //剩余长度小于10240就重新创建一个sitemap
        {
            $this->index++;
            $size=$this->size;
            $this->xml[$this->index]='';
        }
    }
    function write()
    {
        for($i=0;$i<=$this->index;$i++)
        {
            @file_put_contents($this->sitemap_file.'_'.$i.'.xml','<?xml version="1.0" encoding="UTF-8"?> <urlset'.($this->site=='google'?' xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"':'').'>'.$this->xml[$i].'</urlset>');
        }
        $this->write_index();
    }
    function write_index()
    {
        global $_G;
        $size=$this->size;
        $text='<?xml version="1.0" encoding="UTF-8"?>';
        $text.=($this->site=='google')?'<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">':'<sitemapindex>';
        for($i=0;$i<=$this->index && $size>10240;$i++)
        {
            $str='<sitemap><loc>'.Domain('portal').$this->sitemap_file.'_'.$i.'.xml</loc><lastmod>'.date('c').'</lastmod></sitemap>';
            $text.=$str;
            $size-=strlen($str);
        }
        $text.='</sitemapindex>';
        return file_put_contents($this->sitemap_file.'.xml',$text);
    }    
}
$s=array('baidu','google');
    
foreach($s as $se)
    $ct[]=new sitemap_xml($cat.'sitemap_'.$se,$se);
//1.article
$query=DB::query('select aid,dateline from '.DB::TABLE('portal_article_title').' where status>=0'.($article==0 ? '':'  limit 0,'.$article.' '));
while($row=DB::fetch($query)) 
{
    $row['url']=rewriteurl("portal_article",$row['aid']);
    foreach($ct as $key=> $item) 
    {
        $ct[$key]->add_url(Domain('portal').$row['url'],date('c',$row['dateline']),'daily','0.8');
    }
}
//2.froum
$query=DB::query("select fid,type,status from ".DB::table('forum_forum')." where status='1' and type='forum' order by fid ");
while($row=DB::fetch($query))
{
    $row['url']=rewriteurl("forum_forumdisplay",$row['fid']);
    foreach($ct as $key=>$item)
    {
        $ct[$key]->add_url(Domain('forum').$row['url'],date('c'),'always','0.8');
    }
}
//3.thread
$query=DB::query('select tid,lastpost from '.DB::table('forum_thread').' where displayorder>=0 order by tid desc'.($thread==0 ? '':'  limit 0,'.$thread.' '));
while($row=DB::fetch($query))
{
    $row['url']=rewriteurl("forum_viewthread",$row['tid']);
    foreach($ct as $key=>$item)
    {
        $ct[$key]->add_url(Domain('forum').$row['url'],date('c',$row['lastpost']),'daily','0.8');
    }
}
//4.blog
$query=DB::query('select blogid,uid,dateline from '.DB::table('home_blog').' where status>=0 order by blogid desc'.($blog==0 ? '':'  limit 0,'.$blog.' '));
while($row=DB::fetch($query))
{
    $row['url']=rewriteurl("home_blog",$row['uid'],$row['blogid']);
    foreach($ct as $key=>$item)
    {
        $ct[$key]->add_url(Domain('home').$row['url'],date('c',$row['dateline']),'daily','0.6');
    }
}
/*//5.space
$query=DB::query("select uid,regdate from ".DB::table('common_member')." order by uid desc".($space==0 ? '':' limit 0,'.$space.' '));
while($row=DB::fetch($query))
{
    $row['url']=rewriteurl("home_blog",$row['uid']);
    foreach($ct as $key=>$item)
    {
        $ct[$key]->add_url(Domain('home').$row['url'],date('c',$row['regdate']),'daily','0.6');
    }
}*/
foreach($ct as $item)
{
//    $item->add_url(Domain('forum'),date('c'),'always','1.0');
    $item->write();
}
?>