PHP script overloads server

Hi guys,

I have customised version of OpenX ad server, I asked someone to add a code that will read content of meta keywords and depending on that will show accurate ads, it works great however after few days my servers needs restarting because the file takes 99% of server power (to be precise it's pretty good dedicated server).

So... below is a part responsible for extracting meta keywords and serving appropriate ads. Do you guys see something in code that could make it overload the server? Just to clarify again, its purpose is to extract only keywords, not the whole page content. I'm not php geek and i don't understand anything in this code.

$url = $GLOBALS['loc'];

	$fp = fopen( $url, 'r' );
	$content = "";

	while( !feof( $fp ) )
	{
		$buffer = trim(fgets($fp, 4096));
		$content .= $buffer;
	}

	$start = '<title>';
	$end = '<\/title>';

	preg_match( "/$start(.*)$end/s", $content, $match );
	$title = $match[ 1 ];
	

	$metatagarray = get_meta_tags( $url );
		
	$keywords = $metatagarray[ "keywords" ];
	
if(!empty($keywords)) {


		$temp = explode(",",$keywords);

	
		for($i=0;$i<count($temp);$i++)
		{

		$add=explode(' ',trim($temp[$i]));

			if(sizeof($add)> 1)
			{

				$temp=array_merge($temp,$add);
	
			}
	
		}
	
		if(sizeof($temp)< 2)
		{
			$temp = explode(" ",$keywords);
		} 


		 $count = count($temp);

} else {

	$count = 0;

}







$con1 = mysql_connect($GLOBALS['_MAX']['CONF']['database']['host'],$GLOBALS['_MAX']['CONF']['database']['username'],$GLOBALS['_MAX']['CONF']['database']['password']);
mysql_select_db($GLOBALS['_MAX']['CONF']['database']['name'], $con1)or die("culnot select:".mysql_error());
$table_prefix = $GLOBALS['_MAX']['CONF']['table']['prefix'];

$keywordAds = array(); $nokeywordAds = array(); $k = 0; $nk = 0; 
$l = 0; $lastToSendAd = array();



	  $query = mysql_query("SELECT * FROM ".$table_prefix."ad_zone_assoc WHERE zone_id =".$_GET['zoneid']." ") or die("Error1".mysql_error());



	 if(mysql_num_rows($query)>0)
		{   
			while ($rowValues = mysql_fetch_assoc($query)) {	

				 $bannerQuery = mysql_query("SELECT * FROM oxm_keyword WHERE banner_id =".$rowValues['ad_id']." ") or die("Error2".mysql_error());

				if(mysql_num_rows($bannerQuery) > 0) {   

					$rowKeywords = mysql_fetch_assoc($bannerQuery);

						if(($count >= 1)) {

					    		for ($j = 0; $j < $count; $j++)
							{
									if ( strcmp (strtolower(trim($rowKeywords['keyword'])),strtolower(trim($temp[$j]))) == 0 )
									{
										 $lastToSendAd[$l] = $rowKeywords['banner_id'];
										 $l++;

									} 
							}

						} 

					
				 } else {

						$nokeywordAds[$nk] = $rowValues['ad_id'];
						$nk++;

				} 


			}

		}

	$keywordAdsCount =  sizeof($lastToSendAd);


	$nokeywordAdsCount =  sizeof($nokeywordAds);


	
	if($count >= 1) {

			if(!empty($lastToSendAd)) {


				if($keywordAdsCount > 1) {

					$banid=$lastToSendAd[rand(0,($keywordAdsCount-1))];

				} else {

					$banid=$lastToSendAd[0];
				}
					
					$ad = MAX_cacheGetAd($banid);

			} else {

				if($nokeywordAdsCount > 1) {

					$banid=$nokeywordAds[rand(0,($nokeywordAdsCount-1))];

				} else {

					$banid=$nokeywordAds[0];
				}
	
				$ad = MAX_cacheGetAd($banid);


			}


	} else {


				if($nokeywordAdsCount > 1) {

					$banid=$nokeywordAds[rand(0,($nokeywordAdsCount-1))];

				} else {

					$banid=$nokeywordAds[0];
				}
	
				$ad = MAX_cacheGetAd($banid);


	}

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Thanks for help