La fase de grupos del Mundial Rusia 2018: Una introducción a los algoritmos
//Definir bombos
$team1 = 'Rusia';
$team2 = 'Alemania';
$team3 = 'Brasil';
$team4 = 'Portugal';
$team5 = 'Argentina';
$team6 = 'Belgica';
$team7 = 'Polonia';
$team8 = 'Francia';
$team9 = 'España';
$team10 = 'Peru';
$team11 = 'Suiza';
$team12 = 'Inglaterra';
$team13 = 'Colombia';
$team14 = 'Mexico';
$team15 = 'Uruguay';
$team16 = 'Croacia';
$team17...