Código PHP:
$consulta ="select op.Fecha as Fecha,op.id_op as numero,p.Cantidad, c.Nombre as Cliente, prod.Nombre as Producto,e.Nombre as Trabajador,e.Apellido as Apellido
from tbl_op as op, tblproducciones as p, tblclientes as c, tblproducto as prod,tblempleados as e
where ".$fechas.$id_opPOST." p.id_op=op.id_op and
op.Id_Empleado=e.Id_Empleado and c.id_Cliente=op.id_Cliente and prod.id_Producto=p.id_Producto";
este es la cosnulta