Prompt password

prompt_password.php

<?php
/**
 * Interactively prompts for input without echoing to the terminal.
 * Requires a bash shell or Windows and won't work with
 * safe_mode settings (Uses `shell_exec`)
 *
 * @see http://us.php.net/manual/en/function.ncurses-noecho.php
 * @see http://us.php.net/manual/en/function.ncurses-getch.php
 * 
 * Works only on normal OS, not in windows.
 */
function prompt_silent($prompt = "Enter Password: ")
{
    $command = "/usr/bin/env bash -c 'echo OK'";
    if (rtrim(shell_exec($command)) !== 'OK') {
        trigger_error("Can't invoke bash");
        return null;
    }

    $command =
        "/usr/bin/env bash -c 'read -s -p \"" .
        addslashes($prompt) .
        "\" mypassword && echo \$mypassword'";

    $password = rtrim(shell_exec($command));

    return $password;
}