<?php
$weapons =          ['fists', 'whip', 'gun'];
$opponentWeapon =   $weapons[rand(0,2)]; // Cela permet de choisir une arme de manière aléatoire.

if ($opponentWeapon == $weapons[0]) {
    $indyWeapon = "$weapons[2]";
} elseif ($opponentWeapon == $weapons[1]) {
    $indyWeapon = "$weapons[0]";
} else {
    $indyWeapon = "$weapons[1]";
}
echo "$opponentWeapon<br>";
echo "$indyWeapon";
?>