<?php
function register($username,$password,$email) {
    $file = fopen("users.txt", "a");
    fwrite($file,$username . '|' . $password . '|' . $email . "\n";
    fclose($file);
}
function login($username,$password) {
    $list = file_get_contents("users.txt");
    $user_array = explode("\n", $list);
    foreach($user_array as $user) {
        if(strpos($user, $username))
            $this_user = $user;
    }
    if(empty($this_user))
        die("No user found");
    $user_info = explode('|', $this_user);
    if($password == $user_info[2])
        echo "correct password";
    else
        die("bad password");
}
function reset_password($username) {
    $list = file_get_contents("users.txt");
    $user_array = explode("\n", $list);
    foreach($user_array as $user) {
        if(strpos($user, $username)
            $this_user = $user;
    }
    $user_info = explode('|', $this_user);
    mail($user_info[3], "Password Recovery", "Password: " . $user_info[2], "From: noreply@domain.tld");
    echo "Password sent";
}
?>