script that periodically checks the minecraft server log, and tweets when players log in/out

minetweet.php

<?php

//run via cron every 2 minutes

$log_location = "/users/minecraft/minecraft/";
$web_viewable_location = "/var/www/gotham.extrafuture.com/public_html/";
$bot_email = "gotham@extrafuture.com";
$twittermail_account = "";

//Get the log file
$log = file_get_contents($log_location."server.log");
$log = explode("\n", $log);

$loggedinusers = array();
//only look at lines that mention logging in or logging out
foreach($log as $line) {
 if(strpos($line, "logged in with entity id")){
  //logged in
  $parts = explode("[INFO] ", $line);
  $parts = $parts[1];
  $parts = explode(" ", $parts);
  $username = $parts[0];
  $loggedinusers[$username] = $username; 
 } else if (strpos($line, " lost connection: ")) {
  //logged out
  $parts = explode("[INFO] ", $line);
  $parts = $parts[1];
  $parts = explode(" ", $parts);
  $username = $parts[0];
  unset($loggedinusers[$username]); 
 } 
}

//create users.txt if not exists
if(!file_exists($log_location."users.txt")){
  $handle = fopen($log_location."users.txt", "w");
  foreach($loggedinusers as $user) {
    fwrite($handle, $user."\n");
  } 
  fclose($handle);
  //don't bother tweeting, wait until next run 
} else {
  //or get the contents, same type of array as from server.log
  $oldusers = file_get_contents($log_location."users.txt");
  $oldusers = explode("\n", $oldusers);
  $newusers = array();
  foreach($loggedinusers as $loggedinuser) {
    //is this user in $oldusers?
    if(!in_array($loggedinuser, $oldusers)) {
      //new user! add to the new users array
      $newusers[] = $loggedinuser;
    }
  }
  $lostusers = array();
  foreach($oldusers as $olduser) {
    //is this user in $loggedusers?
    if(!in_array($olduser, $loggedinusers)) {
      //lost a user. add to lost users array
      $lostusers[] = $olduser;
    }
  }
  //update users.txt if needed
  if(count($newusers) || count($lostusers)) {
      $handle = fopen($log_location."users.txt", "w");
      foreach($loggedinusers as $user) {
        fwrite($handle, $user."\n");
      }
      fclose($handle);
      //copy users.txt to the web accessible directory
      copy($log_location."users.txt", $web_viewable_location."users.txt"); 
  }
    
  //check to see if this mc username is also a twitter username
  //if so, prepend a ".@" to the tweet
  $headers = 'From: '.$bot_email.'' . "\r\n" .
    'Reply-To: '.$bot_email.'' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();  
  //tweet!
  foreach($newusers as $user) {
    if(strlen($user) > 0) {
      $test = false;
      @$test = file_get_contents("http://twitter.com/$user");
      if($test) { $dotat=".@"; } else { $dotat=""; }
      $text = "$dotat$user has logged in! http://minecraft.net/skin/skin.jsp?user=$user#".time();
      echo $text."\n"; 
      echo mail($twittermail_account, "tweet", $text, $headers); 
    } 
  } 
  foreach($lostusers as $user) {
   if(strlen($user) > 0) { 
      @$test = file_get_contents("http://twitter.com/$user");
      if($test) { $dotat=".@"; } else { $dotat=""; }
      $text = "$dotat$user has logged out. http://minecraft.net/skin/skin.jsp?user=$user#".time();
      echo $text."\n";
      echo mail($twittermail_account, "tweet", $text, $headers); 
   } 
  }
}