Fetches dollar and euro prices from BNA

Requirements

• php4+
• internet connection
• optionally, mysql

Test

$ mysql -u root < schema.sql
$ php cotizacion.php 2017-04-12 2017-04-16 1
{"Dolar U.S.A":{"11\/4\/2017":{"Compra":15.05,"Venta":15.45},"12\/4\/2017":{"Compra":15,"Venta":15.4},"17\/4\/2017":{"Compra":15,"Venta":15.4}},"Euro":{"11\/4\/2017":{"Compra":16.4,"Venta":17.4},"12\/4\/2017":{"Compra":16.4,"Venta":17.4},"17\/4\/2017":{"Compra":16.4,"Venta":17.4}}}
$ mysql -u root bna_test -e 'SELECT * FROM currency;'