PHP验证码使用纯文本(PHP captcha using plain text)

 这是我第一次在这里发帖，因为这也是我第一次决定从头开始为自己建立一个网站。 我正在创建一个带有基本验证码脚本的联系页面。 由于您可能认为疯狂的原因，我想将验证码显示为文本。 我决定反对png，因为（反）别名是非常糟糕的透明背景，我不认为我的网站会引起太多不必要的注意。 
 
 这是我的captcha.php 
 
<?php 

session_start();

$characters_on_image = 4;

$possible_letters = '0123456789';

$code = '';

$i = 0;
while ($i < $characters_on_image) { 
$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);
$i++;
}

echo $code;


header('Content-Type: text/plain');

$_SESSION['code'] = $code;
?>
 
 我遇到的问题是，如果我使用<?php print $_SESSION['code']; ?> <?php print $_SESSION['code']; ?>它会打印上一个代码。 我的编程非常复杂，我想知道是否有办法在<label>标签中显示当前生成的代码？ 

It's my first time posting here as it's also the first time I've decided to build a site from scratch for myself. I'm creating a contact page with a basic captcha script. For reasons you might think are crazy, I want to display the captcha as text. I decided against png as the (anti)aliasing was pretty bad with a transparent background and I don't think my site is going to cause too much unwanted attention yet.
 
Here is my captcha.php
 
<?php 

session_start();

$characters_on_image = 4;

$possible_letters = '0123456789';

$code = '';

$i = 0;
while ($i < $characters_on_image) { 
$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);
$i++;
}

echo $code;


header('Content-Type: text/plain');

$_SESSION['code'] = $code;
?>
 
The problem I'm having is that if I use <?php print $_SESSION['code']; ?> it will print the previous code. My programming is pretty ropey and I was wondering if there is a way to show the current generated code in a <label> tag?

原文：https://stackoverflow.com/questions/10147721