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<?php
// File to save the ip addresses
$UO_Log = 'ip.txt' ;
// Duration in minutes for which a user is considered online
$UO_OnlineTime = 5 ;
// Message to be shown
$UO_Message = empty( $UO_Message ) ? 'Users Online - %d' : $UO_Message ;
$UO_CurrentIp = $_SERVER [ 'REMOTE_ADDR' ];
$UO_CurrentTime = time ();
$UO_RecordsCount = 1 ;
$UO_NewRecord = '' ;
$UO_OnlineTime *= 60 ;
$UO_Records = file ( $UO_Log );
$UO_Records as $UO_Record ){
$UO_Ip , $UO_Time ) = explode ( '|' , $UO_Record );
$UO_Time > ( $UO_CurrentTime - $UO_OnlineTime )) && ( $UO_Ip != $UO_CurrentIp )){
$UO_RecordsCount ++;
$UO_NewRecord .= $UO_Record ;
$UO_NewRecord .= " $UO_CurrentIp | $UO_CurrentTime \n" ;
$UO_Handle = fopen ( $UO_Log , 'w' );
fwrite ( $UO_Handle , $UO_NewRecord );
fclose ( $UO_Handle );
printf ( $UO_Message , $UO_RecordsCount );
?>
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