How to create dynamic insert query using php and mysql?

Question

This is my php array

   $j_obj = Array
    (
        [Cluster] => 1
        [Cost] => 48
        [Conversions] => 20
        [MyColumn] => 45
    )
    Array
    (
        [Cluster] => 1
        [Cost] => 46
        [Conversions] => 20
        [MyColumn] => 37
    )
    Array
    (
        [Cluster] => 1
        [Cost] => 47
        [Conversions] => 19
        [MyColumn] => 40
    )    

The above json array is not static one,it comes dynamically.

I need to insert the array values in mysql insert query.I try the following

foreach ($j_obj as $row) 
{
  print_r(implode(',', $row));
  //$sql = "insert into $tbl_name values(implode(',', $row))";

// I got this value from printing the $row

  //1,48,20,451,46,20,371,47,19,401,51,6

what my need is

  //$sql = "insert into $tbl_name values(1,48,20,451),(46,20,371,47),(19,401,51,6)";
}

The table and columns are also created dynamically from json value,

Can anybody help me ?