我正在做一个我在网上找到的练习来自学 php。我正在制作的程序是一个“猜数字”游戏，我需要生成一个随机数来猜测。当不使用类并使用 html 输入框进行用户输入时，我在练习中取得了成功:
<?php
if(isset($_POST['number'])) {
$number = $_POST['number'];
} else {
$number = rand(1,99);
}
if($_POST["guess"]) {
// grab the user input guess
$guess = $_POST['guess'];
$number = $_POST['number'];
$output = '';
static $count = 0; //Initialize count
if ($guess < $number) {
$output .= "$guess" . "<br />" . "Guess Higher";
$count++;
} elseif($guess > $number) {
$output .= "$guess" . "<br />" . "Guess Lower";
$count++;
} elseif($guess == $number) {
$count++;
$output .= "$guess" . "<br />" . "You got it!" . "<br />" . "You guessed it in " . $count . " trials";
}
} ?>
<!DOCTYPE html>
<html>
<head>
<title>Guess A Number</title>
</head>
<body>
<form action="NumberGuess.php" method="post">
<label for="guess">Guess A Number:</label><br/ >
<input type="text" name="guess" />
<input name="number" type="hidden" value="<?= $number ?>" />
<input name="submit" type="submit" />
<br/>
<?php echo $output ?>
<br/>
</form>
</body>
</html>
但是，现在我想使用 json 作为输入并使用类/对象来重复练习。我尝试使用 rand() 来生成随机数，但是它导致了一个问题并且页面无法加载:
class NumberGuess {
protected $guess = 0;
const randNumber = rand(1,99);
protected $isNumber = false;
protected $higher = true;
function __construct($inputGuess) {
$this->guess = $inputGuess;
}
public function getResult() {
$this->numberChecker();
if($this->higher == true) {
$this->higher = "higher";
} elseif($this->higher == false) {
$this->higher = "lower";
}
if($this->isNumber == false) {
return $this->guess . " is incorrect, " . "try guessing " . $this->higher;
} elseif($this->isNumber == true) {
return $this->guess . " is correct!";
}
}
private function numberChecker() {
if($this->guess < self::randNumber) {
$this->higher = true;
$this->isNumber = false;
} elseif($this->guess > self::randNumber) {
$this->higher = false;
$this->isNumber = false;
} elseif($this->guess == self::randNumber) {
$this->higher = false;
$this->isNumber = true;
}
}
}
if ( isset($_SERVER['QUERY_STRING']) ) {
$inputString = $_SERVER['QUERY_STRING'];
$inputGuess = intval($inputString);
}
$myGuess = new NumberGuess($inputGuess);
echo json_encode($myGuess->getResult());
有人可以向我解释一下如何使用 json 在类中生成随机数吗？
最佳答案
您可以使用 PHP rand()或 mt_rand()生成范围内随机数的函数。
rand()Syntax
int rand ( void )
#OR
int rand ( int $min , int $max )
mt_rand()Syntax
int mt_rand ( void )
#OR
int mt_rand ( int $min , int $max )
注意:您可以使用JavaScript Math.random()即时生成随机数的功能。或者您可以使用 Ajax 使用 PHP 生成随机数。
关于php - 在php类中生成一个随机数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43244407/