Use a combination of "strlen" and "substr" like this:
<?php 
$oldstr="Chat_tatata";
$newstr = substr($oldstr,5, strlen($oldstr));
?>
<?php 
$oldstr="Chat_tatata";
$newstr = substr($oldstr,5, strlen($oldstr));
?>


<?php 
    $idxOfFirtsSpace = indexOf( $text, " ");
$argv2 = substr($argv,$idxOfFirtsSpace , strlen($argv));
?>
<?php 
    IF( $idxOfFirtsSpace == -1 ) THEN
      $command = $text;
      $argv = "";
    ELSE
      $command = subStr( $text,0,$idxOfFirtsSpace );
      $argv = trim( subStr( $text,$idxOfFirtsSpace ) );
    ENDIF
?>
<?php 
 FOREACH ($Racer in getListOfPlayers())
IF (GetPlayerVar($Racer, "ontrack"))
THEN
   globalmsg( $Racer . " is currently in a race");
ENDIF
ENDFOREACH
?>
 
   SetUserStoredValue( $argv , "HC" , "" );
   SetUserStoredValue( $argv , "Cash" , "" );
   SetUserStoredValue( $argv , "Bank" , "" );
   SetUserStoredValue( $argv , "KM" , "" );
   SetUserStoredValue( $argv , "Energy" , "" );


##############
#FTP transfer#
##############
# Results files can also be transferred to an FTP server
# Define the following parameters to use this feature
# Remove # before line to activate it
# -------------------------------------------------------------------
$FtpServer = "www.SERT-LFS.net"; # Name/IP-address of your FTP server
$FtpLogin = "myuser"; # Loginname for your FTP server
$FtpPasswd = "mypass"; # Password for your FTP server
$FtpRemotePath = "www/sert-lfs.net/site/lapperscript/txt"; # Directorname
##############################
#Synchronise Lapper databases#
##############################
#$SyncID="frh01";        # Unique ID for this instance of Lapper
#$SyncDir="synchro";        # Name of synchronisation directory. Every Lapper should have this directory name in order to synchronise
#$SyncIDsToSync="frh02|frh03";    # Lapper ID's to synchronise with
                # Seperate ID's with |
                # You can't use current SyncID here
$SyncID="DEMO1";
$SyncDir="synchro";
$SyncIDsToSync="DEMO2";##############
#FTP transfer#
##############
# Results files can also be transferred to an FTP server
# Define the following parameters to use this feature
# Remove # before line to activate it
# -------------------------------------------------------------------
$FtpServer = "www.SERT-LFS.net"; # Name/IP-address of your FTP server
$FtpLogin = "myuser"; # Loginname for your FTP server
$FtpPasswd = "mypass"; # Password for your FTP server
$FtpRemotePath = "www/sert-lfs.net/site/lapperscript/txt"; # Directorname
##############################
#Synchronise Lapper databases#
##############################
#$SyncID="frh01";        # Unique ID for this instance of Lapper
#$SyncDir="synchro";        # Name of synchronisation directory. Every Lapper should have this directory name in order to synchronise
#$SyncIDsToSync="frh02|frh03";    # Lapper ID's to synchronise with
                # Seperate ID's with |
                # You can't use current SyncID here
$SyncID="DEMO2";
$SyncDir="synchro";
$SyncIDsToSync="DEMO1";

<?php 
openPrivButton( $argv,"test2",160,15,35,5,5,-1,32, $var1 );  
?>

##############################
#Synchronise Lapper databases#
##############################
#$SyncID="frh01";        # Unique ID for this instance of Lapper
#$SyncDir="synchro";        # Name of synchronisation directory. Every Lapper should have this directory name in order to synchronise
#$SyncIDsToSync="frh02|frh03";    # Lapper ID's to synchronise with
                # Seperate ID's with |
                # You can't use current SyncID here
$SyncID="DEMO1";
$SyncDir="synchro";
$SyncIDsToSync="DEMO2";##############################
#Synchronise Lapper databases#
##############################
#$SyncID="frh01";        # Unique ID for this instance of Lapper
#$SyncDir="synchro";        # Name of synchronisation directory. Every Lapper should have this directory name in order to synchronise
#$SyncIDsToSync="frh02|frh03";    # Lapper ID's to synchronise with
                # Seperate ID's with |
                # You can't use current SyncID here
$SyncID="DEMO2";
$SyncDir="synchro";
$SyncIDsToSync="DEMO1";##############
#FTP transfer#
##############
# Results files can also be transferred to an FTP server
# Define the following parameters to use this feature
# Remove # before line to activate it
# -------------------------------------------------------------------
$FtpServer = "www.SERT-LFS.net"; # Name/IP-address of your FTP server
$FtpLogin = "my_ftp_user"; # Loginname for your FTP server
$FtpPasswd = "my_ftp_pass"; # Password for your FTP server
$FtpRemotePath = "www/sert-lfs.net/site/lapperscript/txt"; # Directorname
<?php 
Sub AutoTrackChangeOff($KeyFlags,$id)
    IF($AutoTrackChange == "off")
    THEN
    privMsg( "^7>ATC ALREADY TURNED ^1OFF!!!");
    ELSE
    $AutoTrackChange = "off";
    RemoveScheduleAction( SA_RotateTrack0 );
    RemoveScheduleAction( SA_RotateTrack3 );
    RemoveScheduleAction( SA_RotateTrack6 );
    RemoveScheduleAction( SA_RotateTrack9 );
    RemoveScheduleAction( SA_RotateTrack12 );
    RemoveScheduleAction( SA_RotateTrack15 );
    RemoveScheduleAction( SA_RotateTrack18 );
    RemoveScheduleAction( SA_RotateTrack21 );
    cmdLFS("/msg ^7>" . GetCurrentPlayerVar("Nickname") . "^7 Turned ATC ^1OFF!!!" );
    ENDIF
    ClosePrivButton("ATCONOFF&ATCON&ATCOFF");
EndSub
?>