?php
// 標準輸入流和標準輸出流
$stdin = null;
$stdout = null;
 
/**
 * 初始化 IO 流
 */
function init() {
 global $stdin;
 global $stdout;
 
 $stdin = fopen('php://stdin', 'r');
 $stdout = fopen('php://stdout', 'w');
}
 
/**
 * 關閉 IO 流
 */
function destroy() {
 global $stdin;
 global $stdout;
 
 if(is_resource($stdin)) {
 fclose($stdin);
 }
 if(is_resource($stdout)) {
 fclose($stdout);
 }
}
 
/**
 * 從命令行讀取一行數據
 */
function read() {
 global $stdin;
 
 $line = fgets($stdin);
 return trim($line, PHP_EOL); //去除換行符
}
 
/**
 * 向命令行輸出一行數據
 */
function write($line) {
 global $stdout;
 // 轉換編碼
 if(stripos(PHP_OS, 'winnt') !== false) {
 $line = iconv('UTF-8', 'GBK', $line);
 }
 fwrite($stdout, $line . PHP_EOL);
}
 
/**
 * 第一種玩法
 * @param $count 位數
 */
function guess_the_number($count = 2) {
 // 隨機生成一個 $count 位數
 $min = pow(10, $count - 1);
 $max = pow(10, $count) - 1;
 $number = rand($min, $max);
 init();
 while(1) {
 write(sprintf('Please input your number (%s-bit digit), q or quit exit: ', $count));
 $readStr = read();
 // exit program
 if($readStr == 'q' || $readStr == 'quit') {
 break;
 }
 $readInt = intval($readStr);
 if($readInt > $number) {
 write('大了');
 } else if($readInt  $number) {
 write('小了');
 } else {
 write('恭喜你，猜對了!');
 write('Input c continue to play');
 $readStr = read();
 if($readStr == 'c' || $readStr == 'continue') {
 $number = rand($min, $max);
 } else { 
 break ;
 }
 }
 }
 destroy();
}
 
/**
 * 得到一個沒有重復數字的四位數
 */
function getRandNumber() {
 $num = rand(1, 9);
 $array = array_diff(array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9), [$num]);
 shuffle($array);
 $subarr = array_slice($array, 0, 3); //再取 3 個數字
 $str = implode('', array_merge([$num], $subarr));
 return intval($str);
}
 
/**
 * 第二種玩法
 */
function guess_the_number2() {
 $number = getRandNumber();
 $len = 4; //四位數
 init();
 while(1) {
 write(sprintf('Please input your number (%s-bit digit), q or quit exit: ', $len));
 $readStr = read();
 // exit program
 if($readStr == 'q' || $readStr == 'quit') {
 break;
 }
 $readInt = intval($readStr);
 if($readInt == $number) {
 write('恭喜你，猜對了!');
 write('Input c continue to play');
 $readStr = read();
 if($readStr == 'c' || $readStr == 'continue') {
 $number = getRandNumber();
 } else { 
 break ;
 }
 } else {
 // 判斷 幾A幾B
 $readInt = str_pad($readInt, $len, '0', STR_PAD_LEFT); //不足四位的補足四位
 $number = strval($number);
 $readArr = str_split($readInt, 1); // cast to array
 $numArr = str_split($number, 1);
 $aval = 0; // 幾A
 $bval = 0; // 幾B
 for($i = 0; $i  $len; $i++) {
 if($readArr[$i] == $numArr[$i]) {
 $aval++;
 unset($readArr[$i], $numArr[$i]);
 }
 }
 $bval = count(array_intersect($readArr, $numArr));
 write(sprintf('%sA%sB', $aval, $bval));
 }
 }
 destroy();
}
 
if(PHP_SAPI == 'cli') {
 // guess_the_number(1);
 guess_the_number2();
} else {
 echo 'Please run under command line!';
 exit;
}