<?php

$LogLineArray = array();
$LogFirstLineWritten = 0;
 
function ErrorLog ($Msg)
{
  global $LogLineArray;
  global $LogFirstLineWritten;
  $LogFirstLineWritten = 1;
  $LogLineArray[count($LogLineArray)]=LogFormatMessage($Msg);
  $Dbg=debug_backtrace();
  for ($i=0; $i<count($Dbg);$i++) $LogLineArray[count($LogLineArray)]= " - (Callstack $i) ".$Dbg[$i]['file'].":".$Dbg[$i]['line']."\n";
}

function LogWriteToFile ()
{
  global $LogLineArray;
  global $GlobalLogfile;
  global $LogFirstLineWritten;
  global $GlobalLogfileMaxLength;

  if ($GlobalLogfile && $LogFirstLineWritten)
  {
    //read existing file
    $ExistingFileArray=array();
    if (file_exists($GlobalLogfile))
      $ExistingFileArray=file($GlobalLogfile);
      
    //merge both line arrays
    $ExistingFileArray[count($ExistingFileArray)]="\n";
    foreach ($LogLineArray as $x)
      $ExistingFileArray[count($ExistingFileArray)]=$x;
    
    //save to file
    $FileHandler=fopen($GlobalLogfile,'w');
    $Length=count($ExistingFileArray);
    for ($i= (($Length>$GlobalLogfileMaxLength) ? $Length-$GlobalLogfileMaxLength:0); $i<$Length;$i++)
      fputs($FileHandler,$ExistingFileArray[$i]);
    fclose($FileHandler);
  }
}

function LogClose ()
{
  LogWriteToFile();
}

function LogFormatMessage ($Msg)
{
  global $GlobalTimeZone;
  global $GlobalTimeFormat;
  date_default_timezone_set($GlobalTimeZone);
  $NewMsg = "";
  $NewMsg .= "[".date($GlobalTimeFormat,time())."]";
  $NewMsg .= $Msg . "\n";
  return $NewMsg;
}

?>