SilentPromptingTrait.php

<?php
/**
 * A trait to add silent prompts to Yii2 Console Controller
 * Requires bash shell
 */
trait SilentPromptingTrait {
	/**
	 * @see http://www.dzone.com/snippets/password-prompt-php
	 * Interactively prompts for input without echoing to the terminal.
	 * Requires a bash shell and won't work with safe_mode settings (Uses `shell_exec`)
	 * @return string the user input
	 */
	public function promptSilent($prompt) {
		$command = "/usr/bin/env bash -c 'echo OK'";
		if (rtrim(shell_exec($command)) !== 'OK') {
			trigger_error("Can't invoke bash");
			return;
		}
		$command = "/usr/bin/env bash -c 'read -s -p \"" . 
			addslashes($prompt) . 
			"\" value && echo \$value'";
		$value = rtrim(shell_exec($command));
		echo "\n";
		return $value;
	}
}