Code example sharing for implementing number guessing game in PHP

There are two ways to play the guessing game:

The first one: two people play, one party gives the number and the other party guesses. The person who guesses the number must think of a number with a specified number of digits. The number can be repeated and the guesser cannot know it.

Anyone who guesses can start guessing. Every time a number is guessed, the person who guesses the number must say whether it is greater or less than the number.

Second type: Two people play, one party gives the number and the other party guesses. The person who guesses the number must first think of a 4-digit number without repeated numbers, and cannot let the guesser know. Anyone who guesses

can start guessing. Every time you guess a number, the person who guesses the number will give out how many A's and how many B's according to this number. The number before A indicates the number of numbers in the correct position, and the number before

The number represents the number of numbers with correct numbers but incorrect positions. For example, the correct answer is 5234, and the guesser guesses 5346, which is 1A2B. One of the 5 bits

is set correctly, which is recorded as 1A, and the two digits 3 and 4 are The number is correct, but the position is not, so it is recorded as 2B, which adds up to 1A2B. The person who guesses then continues to guess based on the number

of the questioner until he guesses correctly.

The following is the PHP code implementation:

<?php
// 标准输入流和标准输出流
$stdin = null;
$stdout = null;

/**
 * 初始化 IO 流
 */
function init() {
	global $stdin;
	global $stdout;
	
	$stdin = fopen(&#39;php://stdin&#39;, &#39;r&#39;);
	$stdout = fopen(&#39;php://stdout&#39;, &#39;w&#39;);
}

/**
 * 关闭 IO 流
 */
function destroy() {
	global $stdin;
	global $stdout;
	
	if(is_resource($stdin)) {
		fclose($stdin);
	}
	if(is_resource($stdout)) {
		fclose($stdout);
	}
}

/**
 * 从命令行读取一行数据
 */
function read() {
	global $stdin;
	
	$line = fgets($stdin);
	return trim($line, PHP_EOL); //去除换行符
}

/**
 * 向命令行输出一行数据
 */
function write($line) {
	global $stdout;
	// 转换编码
	if(stripos(PHP_OS, &#39;winnt&#39;) !== false) {
		$line = iconv(&#39;UTF-8&#39;, &#39;GBK&#39;, $line);
	}
	fwrite($stdout, $line . PHP_EOL);
}

/**
 * 第一种玩法
 * @param $count 位数
 */
function guess_the_number($count = 2) {
	// 随机生成一个 $count 位数
	$min = pow(10, $count - 1);
	$max = pow(10, $count) - 1;
	$number = rand($min, $max);
	init();
	while(1) {
		write(sprintf(&#39;Please input your number (%s-bit digit), q or quit exit: &#39;, $count));
		$readStr = read();
		// exit program
		if($readStr == &#39;q&#39; || $readStr == &#39;quit&#39;) {
			break;
		}
		$readInt = intval($readStr);
		if($readInt > $number) {
			write(&#39;大了&#39;);
		} else if($readInt < $number) {
			write(&#39;小了&#39;);
		} else {
			write(&#39;恭喜你，猜对了!&#39;);
			write(&#39;Input c continue to play&#39;);
			$readStr = read();
			if($readStr == &#39;c&#39; || $readStr == &#39;continue&#39;) {
				$number = rand($min, $max);
			} else {				
				break ;
			}
		}
	}
	destroy();
}

/**
 * 得到一个没有重复数字的四位数
 */
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 个数字
	$str = implode(&#39;&#39;, array_merge([$num], $subarr));
	return intval($str);
}

/**
 * 第二种玩法
 */
function guess_the_number2() {
	$number = getRandNumber();
	$len = 4; //四位数
	init();
	while(1) {
		write(sprintf(&#39;Please input your number (%s-bit digit), q or quit exit: &#39;, $len));
		$readStr = read();
		// exit program
		if($readStr == &#39;q&#39; || $readStr == &#39;quit&#39;) {
			break;
		}
		$readInt = intval($readStr);
		if($readInt == $number) {
			write(&#39;恭喜你，猜对了!&#39;);
			write(&#39;Input c continue to play&#39;);
			$readStr = read();
			if($readStr == &#39;c&#39; || $readStr == &#39;continue&#39;) {
				$number = getRandNumber();
			} else {				
				break ;
			}
		} else {
			// 判断 几A几B
			$readInt = str_pad($readInt, $len, &#39;0&#39;, STR_PAD_LEFT); //不足四位的补足四位
			$number = strval($number);
			$readArr = str_split($readInt, 1); // cast to array
			$numArr = str_split($number, 1);
			$aval = 0; // 几A
			$bval = 0; // 几B
			for($i = 0; $i < $len; $i++) {
				if($readArr[$i] == $numArr[$i]) {
					$aval++;
					unset($readArr[$i], $numArr[$i]);
				}
			}
			$bval = count(array_intersect($readArr, $numArr));
			write(sprintf(&#39;%sA%sB&#39;, $aval, $bval));
		}
	}
	destroy();
}

if(PHP_SAPI == &#39;cli&#39;) {
	// guess_the_number(1);
	guess_the_number2();
} else {
	echo &#39;Please run under command line!&#39;;
	exit;
}

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