「第18回オフラインリアルタイムどう書くの参考問題」をPHPで解く

<?php

    class MAFOVAFO{
        /**
        * 山折り谷折り
        * @param String 「JZ」みたいな文字列
        * @return String 「mVVmV」みたいな文字列
        **/
        public function get($input){
            $str = '';
            for($i=strlen($input)-1; $i>=0; $i--){
                switch($input[$i]){
                case 'J':
                    $str = $str . 'V' . $this->reverse($str);
                    break;
                case 'L':
                    $str = $this->reverse($str) . 'V' . $str;
                    break;
                case 'Z':
                    $str = $str . 'm' . $this->reverse($str) . 'V' . $str;
                    break;
                case 'S':
                    $str = $str . 'V' . $this->reverse($str) . 'm' . $str;
                    break;
                case 'U':
                    $str = $this->reverse($str) . 'V' . $str . 'V' . $this->reverse($str);
                    break;
                }
            }
            return $str;
        }

        // 反転する
        private function reverse($input){
            // 文字列を逆に
            $input = strrev($input);
            // mVを逆に 一括でm←→Vができない
            $input = str_replace(['m', 'V'],['t', 'm'], $input);
            $input = str_replace('t','V', $input);
            return $input;
        }

    }

    // 以下はテスト
    $test = [
        ['JZ', 'mVVmV'],
        ['J', 'V'],
        ['L', 'V'],
        ['Z', 'mV'],
        ['U', 'VV'],
        ['S', 'Vm'],
        ['JL', 'VVm'],
        ['JS', 'VmVVm'],
        ['JU', 'VVVmm'],
        ['LU', 'mmVVV'],
        ['SL', 'VVmmV'],
        ['SS', 'VmVVmmVm'],
        ['SU', 'VVVmmmVV'],
        ['SZ', 'mVVmVmmV'],
        ['UL', 'mVVVm'],
        ['UU', 'mmVVVVmm'],
        ['UZ', 'mVVmVVmV'],
        ['ZJ', 'VmmVV'],
        ['ZS', 'VmmVmVVm'],
        ['ZZ', 'mVmmVVmV'],
        ['JJJ', 'VVmVVmm'],
        ['JJZ', 'mVVmVVmVmmV'],
        ['JSJ', 'VVmmVVmVVmm'],
        ['JSS', 'VmVVmmVmVVmVVmmVm'],
        ['JUS', 'VmVVmVVmVVmmVmmVm'],
        ['JUU', 'mmVVVVmmVVVmmmmVV'],
        ['JUZ', 'mVVmVVmVVmVmmVmmV'],
        ['LJJ', 'VmmVVVm'],
        ['LLS', 'VmmVmVVmVVm'],
        ['LLU', 'mmmVVVmmVVV'],
        ['LLZ', 'mVmmVVmVVmV'],
        ['LSU', 'mmVVVmmmVVVVmmmVV'],
        ['LSZ', 'mVVmVmmVVmVVmVmmV'],
        ['LZL', 'mmVVmVVmmVV'],
        ['LZS', 'VmmVmVVmVVmmVmVVm'],
        ['LZU', 'mmmVVVmmVVVmmmVVV'],
        ['SJL', 'VVmVVmmmVVm'],
        ['SLU', 'mmVVVVmmmVVmmmVVV'],
        ['SLZ', 'mVVmVVmVmmVmmVVmV'],
        ['SSU', 'VVVmmmVVVmmVVVmmmmVVVmmmVV'],
        ['SUJ', 'mVVVmVVmmmVmmVVVm'],
        ['SUS', 'VmVVmVVmVVmmVmmVmmVmVVmVVm'],
        ['SZZ', 'mVmmVVmVVmVmmVVmVmmVmmVVmV'],
        ['UJJ', 'VmmVVVmVVmm'],
        ['ULU', 'mmmVVVmmVVVVmmmVV'],
        ['ULZ', 'mVmmVVmVVmVVmVmmV'],
        ['UUU', 'VVmmmmVVVmmVVVVmmVVVmmmmVV'],
        ['ZJU', 'VVVmmmVVmmmVVVVmm'],
        ['ZLS', 'VmVVmmVmmVmVVmVVm'],
        ['ZSJ', 'VVmmVmmVVmmVVVmmV'],
        ['ZUJ', 'mVVVmmVmmmVVmVVVm'],
        ['JJLJ', 'mVVVmmVVmVVmmmV'],
        ['JLJJ', 'VmmVVVmVVmmmVVm'],
        ['JLJL', 'VmmVVVmVVmmmVVm'],
        ['LJJL', 'VVmmVmmVVVmVVmm'],
        ['LLJJ', 'VmmmVVmVVmmVVVm'],
        ['SZUS', 'VmVVmVVmmVmmVmmVmVVmVVmVVmVVmmVmmVmmVmVVmVVmVVmmVmmVmmVmVVmVVmmVmmVmmVmVVmVVmVVm'],
        ['ULLS', 'VmmVmmVmVVmVVmmVmVVmVVmVVmmVmmVmVVm'],
        ['JJJJZJ', 'VmmVVVmmVVmVVmmVVmmmVVmVVmmVVVmmVVmmVmmVVmmmVVmVVmmVVVmmVVmVVmmVVmmmVVmmVmmVVVmmVVmmVmmVVmmmVVm'],
        ['JULLLJ', 'mmVmmVVmmmVVmVVVmmVmmVVVmmVVmVVVmmVmmVVmmmVVmVVVmmVmmVVVmmVVmVVmmmVmmVVmmmVVmVVmmmVmmVVVmmVVmVV'],
        ['LJJJUL', 'mVVVmVVmmmVVmVVVmmVmmmVmmVVVmVVmmmVmmVVVmmVmmmVVmVVVmVVmmmVVmVVVmmVmmmVVmVVVmVVmmmVmmVVVmmVmmmV'],
        ['LJSJJL', 'VVmVVmmVVVmmVmmmVVmVVmmmVVmmVmmVVVmVVmmmVVmmVmmVVVmVVmmVVVmmVmmmVVmVVmmVVVmmVmmVVVmVVmmmVVmmVmm'],
        ['LZLLLJ', 'mmVmmVVmmmVVmVVmmmVmmVVVmmVVmVVVmmVmmVVmmmVVmVVVmmVmmVVVmmVVmVVmmmVmmVVmmmVVmVVVmmVmmVVVmmVVmVV'],
        ['SJJJJL', 'VVmVVmmVVVmmVmmVVVmVVmmmVVmmVmmVVVmVVmmVVVmmVmmmVVmVVmmmVVmmVmmmVVmVVmmVVVmmVmmVVVmVVmmmVVmmVmm'],
        ['ZLJLJL', 'VmmVVVmmVmmmVVmVVmmVVVmVVmmmVVmmVmmVVVmmVmmmVVmmVmmVVVmVVmmmVVmVVmmVVVmmVmmmVVmVVmmVVVmVVmmmVVm'],
    ];

    $mafovafo = new MAFOVAFO();
    foreach($test as $key=>$data){
        $answer = $mafovafo->get($data[0]);
        if($answer !== $data[1]){
            print('えらー');
        }
    }