PHP: EPG-Daten performant auslesen

$anfang = microtime(true);


$channels = file("/etc/vdr/channels.conf");


$channels_count = count($channels);


for($n=1;$n<$channels_count;$n++) {
  if(substr($channels[$n],0,1) != ":") {
	$usedchannels[] = $channels[$n];
  }
  else {
    $n = $channels_count;
  }
}


$usedchannels_count = count($usedchannels);


for($n=0;$n<$usedchannels_count;$n++) {


$channel_explode = explode(":", $usedchannels[$n]);
$channel_id = $channel_explode[3] . "-" . $channel_explode[10] . "-" . $channel_explode[11] . "-" . $channel_explode[9];


echo "<br><br>" . $channel_explode[0];


exec("svdrpsend.pl LSTE " . $channel_id, $epgdata);


$epgdata_count = count($epgdata);


for($i=0;$i<$epgdata_count;$i++) {




  switch (substr($epgdata[$i],4,1)) {
    case "E":  //Event
	  $event_array = explode(" ", $epgdata[$i]);
	  $start_time = date("H:i", $event_array[2]);
	  //echo $start_time . " - ";
	  break;
	case "T":  //Title
	  $event_title = substr($epgdata[$i], 6);
	  //echo $event_title . " - ";
	  break;
	case "S":  //Subtitle
	  $event_subtitle = substr($epgdata[$i], 6);
	  //echo $event_subtitle . " - ";	  
	  break;
	case "D":  //Description
 	  $event_description = substr($epgdata[$i], 6);
	  //echo $event_description . "<br>\n";	  
	  break;
	}
}
}




$ende = microtime(true);


$zeit = ($ende - $anfang) ;// 1000;


echo $anfang . " - " . $ende ."<br><br>";




echo "<br><br>" . $zeit;

$anfang = microtime(true);


$filename = "/data/video0/epg.data";


$channels = file("/etc/vdr/channels.conf");


$channels_count = count($channels);


for($n=1;$n<$channels_count;$n++) {
  if(substr($channels[$n],0,1) != ":") {
	$usedchannels[] = $channels[$n];
	$channel_explode = explode(":", $channels[$n]);
    $channel_id[] = $channel_explode[3] . "-" . $channel_explode[10] . "-" . $channel_explode[11] . "-" . $channel_explode[9];
  }
  else {
    $n = $channels_count;
  }
}


$usedchannels_count = count($usedchannels);




$handle = @fopen($filename, "r");
if ($handle) {
   while (!feof($handle)) {
      $buffer = fgets($handle);
      for($i=0;$i<$usedchannels_count;$i++) {  
		if(strpos($buffer, $channel_id[$i]) != FALSE) {
		  echo $buffer . "<br>";
	    }
      }
   }
   fclose($handle);
}


$ende = microtime(true);
$zeit = ($ende - $anfang);
echo $zeit;