new Menu = menu_create("Hello World","_MyMenu");
menu_addtext(Menu,"Test");

public _MyMenu(id,Menu,Item)
{
    switch(Item)
    {
        case 0: client_print(id,print_chat,"Test Selected.");
    }
}

 #include <amxmodx>
 #include <amxmisc>
 #include <fun>

 public plugin_init()
 {
    //Register a way to get to your menu...
    register_clcmd( "my_player_menu","AwesomeMenu");
 }
 public AwesomeMenu(id)
 {
    //Create a variable to hold the menu
    new menu = menu_create("\rLook at this Player Menu!:", "menu_handler");

    //We will need to create some variables so we can loop through all the players
    new players[32], pnum, tempid;

    //Some variables to hold information about the players
    new szName[32], szTempid[10];

    //Fill players with available players
    get_players(players, pnum);

    //Start looping through all players
    for( new i; i<pnum; i++ )
    {
        //Save a tempid so we do not re-index
        tempid = players[i];
        
        if( is_user_admin(tempid) )
        {
            //Get the players name and id as strings
            get_user_name(tempid, szName, 31);
            num_to_str(tempid, szTempid, 9);

            //Add the item for this player
            menu_additem(menu, szName, szTempid, 0);
        }
    }

    //We now have all players in the menu, lets display the menu
    menu_display(id, menu, 0);
 }
 public menu_handler(id, menu, item)
 {
    if( item == MENU_EXIT )
    {
        menu_destroy(menu);
        return PLUGIN_HANDLED;
    }

    new data[6], iName[64];
    new access, callback;
    menu_item_getinfo(menu, item, access, data,5, iName, 63, callback);

    //Get the id of the player that was selected
    new tempid = str_to_num(data);

    //If the player is alive
    if( is_user_alive(tempid) )
        //Set their health to 100
        set_user_health(tempid, 100);

    menu_destroy(menu);
    return PLUGIN_HANDLED;
 }