05. Login

<?php

$username = readline();
$pass = strrev($username);

for ($i = 0; $i <= 3; $i++) {
    $input = readline();
    if ($pass == $input) {
        echo "User $username logged in." . PHP_EOL;
        break;
    } else if ($i == 3) {
        echo "User $username blocked!" . PHP_EOL;
    } else {
        echo "Incorrect password. Try again." . PHP_EOL;
    }
}