[Kane]

Your first option would probably be to use sscanf.

PHP код:

CMD:wave( playerid, cmdtext[] ) {
    
    new 
        a_szTmpDelim[ 128 ],
        iIndex,
        iGivePlayerID
    ;
    a_szTmpDelim = strtok( cmdtext, iIndex );
    if( isnull( a_szTmpDelim ) )
    {
        SendClientMessage( playerid, -1, "/wave [playerid/PoN]" );
        return 1;
    }
    sscanf( a_szTmpDelim, "u", iGivePlayerID );
    if( !IsPlayerConnected( iGivePlayerID ) )
    {
        SendClientMessage( playerid, COLOR_RED, "Playerid specified is invalid." );
        return 1;
    }
    return 1;
} 


Or create a function to loop through players and compare names, etc.