JBlond/php-cli

<?php
namespace jblond\cli;


/**
 * Class cli
 * @package jblond\helper
 */
class Cli {

    /**
     * @param string $prompt
     * @param array|string $validInputs
     * @param string $default
     * @return string
     */
    public function input(string $prompt, $validInputs, string $default = ''): string
    {
        echo $prompt;
        $input = trim(fgets(fopen('php://stdin', 'rb')));
        while(
            !isset($input) ||
            (
                is_array($validInputs) &&
                !in_array($input, $validInputs, true)
            ) ||
            (
                $validInputs === 'is_file' &&
                !is_file($input)
            ) ||
            (
                !empty($validInputs) && $input !== $validInputs
            )
        ){
            echo $prompt;
            $input = trim(fgets(fopen('php://stdin', 'rb')));
            if(empty($input) && !empty($default)) {
                $input = $default;
            }
        }
        return $input;
    }

    /**
     * @param string $output
     */
    public function output(string $output): void
    {
        $out = fopen('php://output', 'wb');
        fwrite($out, $output);
        fclose($out);
    }

    /**
     * @param string $string
     */
    public function error(string $string): void
    {
        $stdError = fopen('php://stderr', 'wb');
        fwrite($stdError, $string);
        fclose($stdError);
    }
}