This goes at the top of main.nut file

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/* A global constant/array which stores IDs of online players */
PlrsOnline <- [ ];
/* A global constant/array which handels the functions */
Players <- { };


This goes at the top of onPlayerJoin( player ) function

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/* Lets adds the ID of player to the online players list */
Players.Inc( player.ID );


This goes at the top of onPlayerPart( player, reason ) function

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/* Remove the ID of player from the online players list */
Players.Dec( player.ID );


These functions can be pasted at any place in the script

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/* This functions push the ID to the array */
Players.Inc <- function( Plr_ID ) {
   /* Check is id already available in array, return if it's available */
   if ( PlrsOnline.find( Plr_ID ) != null ) return 0; // Just for precautionary measurement if not removed due to any reason
   /* If it's not available push the ID to the array */
   PlrsOnline.push( Plr_ID );
}
/* This functions removes the ID from the array */
Players.Dec <- function( Plr_ID ) {
   /* Check is id already available in array, return if it's available */
   if ( PlrsOnline.find( Plr_ID ) == null ) return 0; // once again it's for precautionary measurement
/* If it's available remove the ID from array */
PlrsOnline.remove( PlrsOnline.find( Plr_ID ) );
}


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foraceh( iPlrID in PlrsOnline )
{
   local plr = FindPlayer( iPlrID );
   if ( plr ) print("found");
}


---

(click to show/hide)

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foraceh( iPlrID in PlrsOnline )
{
   local plr = FindPlayer( iPlrID );
   if ( plr ) plr.Health = -1;
}


(click to show/hide)

Lets suppose we want to get all players having hp less then 50%

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foraceh( iPlrID in PlrsOnline )
{
   local plr = FindPlayer( iPlrID );
   if ( plr && plr.Health <= 50 ) print( "Found player "+plr.Name+" with ID: "+plr.ID+" having HP: "+plr.Health+"" );
}