<?php
if(!function_exists('file_put_contents')) {
  function file_put_contents($filename, $data, $file_append = false) {
   $fp = fopen($filename, (!$file_append ? 'w+' : 'a+'));
   if(!$fp) {
     trigger_error('file_put_contents cannot write in file.', E_USER_ERROR);
     return;
   }
   fwrite($fp, $data);
   fclose($fp);
  }
}

function checkTraffic()
{
	clearstatcache();
	$filename = "/tmp/loadfile_sjb.txt";

	#if the file doesn't exist, just touch the file and exit
	if( !file_exists( $filename ) )
	{
		touch( $filename );
		return;
	}

	#get the timestamp for "now"
	$now = time();

	#stat the file for its "last modified" date
	$lastModified = filemtime( $filename );

	#stat the file for its # of bytes as byteCount
	$byteCount = filesize( $filename );

	#count the number of seconds that have passed
	$elapsedTime = $now - $lastModified;

	#add one byte ("user") to byteCount
	$byteCount += 1;

	#remove a byte ("user") from byteCount for every 4 seconds that have
	#passed. Don't go below 0
	$byteCount = max(   ( $byteCount - floor($elapsedTime/4) ), 0   );

	#save byteCount bytes into the file, immediately close
	file_put_contents( $filename, str_pad('', $byteCount) );

	#if there are < 300 users, just exit
	if( $byteCount < 300 ) { return; }

	#if there are > 300 users, redirect to "high traffic" page
	#(the high traffic page should say "Bandwidth costs us money!")
	#(the high traffic page should beg for money)
	header("Location: high_traffic.php");
}

checkTraffic();
?>