php实现监控varnish缓存服务器的状态

<?php
$outfile=shell_exec("/usr/bin/varnishstat -x");
$xml=simplexml_load_string($outfile);
echo $xml->getName() . "<br />";
foreach($xml->children() as $child)
? {
????? //$tmpName="";
????? foreach($child->children() as $subChild)
????? {
??????? if ($subChild->getName() =="name" )
???????? {
??????????? $tmpName=$subChild;
??????? }
??????? else? if ($subChild->getName() =="value" )
??????? {
??????????? if ($tmpName!="")
??????????? {
?????????????? $arys["$tmpName"]=$subChild;
?????????????? $tmpName="";
??????????? }
??????? }
??????? else
???????? {
??????????? continue;
??????? }
????? }
? }
? function byteReduce($bytes)
? {
????? if ($bytes>1099511627776)
????? {
????????? return round($bytes/1099511627776)."TB";
????? }
????? else if ($bytes > 1073741824)
????? {
????????? return round($bytes/1073741824)."GB";
????? }
????? else if ($bytes>1048576)
????? {
????????? return round($bytes/1048576)."MB";
????? }
????? else if ($bytes>1024)
????? {
????????? return round($bytes/1024)."KB";
????? }
????? else
????? {
????????? return $bytes."B";
????? }
? }
? echo "client_conn: ".$arys["client_conn"] . "<br />";
? echo "client_req: ".$arys["client_req"] . "<br />";
? echo "cache_hit: ".$arys["cache_hit"] . "<br />";
? echo "cache_miss: ".$arys["cache_miss"] . "<br />";
? echo "Cache hit rate: ".round(($arys["cache_hit"]/$arys["client_req"])*100)." % <br/>";
? echo "LRU nuked objects: ".$arys[n_lru_nuked]."<br/>";
? echo " ".byteReduce($arys["s_bodybytes"]+$arys["s_hdrbytes"])." Acc Content (".byteReduce($arys["s_hdrbytes"])." header ".byteReduce($arys["s_bodybytes"])." Body)";
?>