php 5.4 - php -- fetching data from a table and matching with another table to get data -

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i have 2 tables; dashboard_map_items , device_data_current. in dashboard_map_items have 2 field, id , command , in device_data_current have 3 field id, commands, current_value. based on id , commands in dashboard_map_items need current_data device_data_current.

now dont know start. before able hard-code id , command , fetch current_data device_data_current not working me anymore, because id , commands changed in future. 

$currentvalues = devicedatacurrent::where('map_id', 1)           ->where('system_id', $system_id)           ->where('command', 1)->where('id', 64)           ->orderby('datetime', 'desc')->take(1)->get();

this doing data. if using laravel 4.2 framework dont know has laravel. pure php. appreciated.

i found solution

$currentvalues = dashboardmapitem::where('system_id', $system_id)  ->select()->join('device_data_current', function($join){                   $join->on('device_data_current.id', '=', 'dashboard_map_items.device_id');                   $join->on('device_data_current.command', '=', 'dashboard_map_items.command'); }) ->get();  dd($currentvalues->toarray());

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