好的，所以我正在尝试制作自己的验证码系统。我有两个页面，表单页面和表单操作。这是我的代码：
<html>
<head>
<title>Captcha</title>
<center>
<form method="POST" action="captcha.php">
<label>Entered Text: </label><input type="text" name="captcha">
<input type="submit" name="submit" value="Submit Captcha!">
</form>
</center>
</head>
</html>
<?php
$firstdigit = rand(1, 9);
$seconddigit = rand(27, 105);
$lastdigit = rand(1050, 9515);
$middle = rand(1000, 20000);
$captcha = "<b><center><font face=\"Arial\">AX-$firstdigit-X-$seconddigit-K3I$middle-AN3Z-$lastdigit</font></center></b>";
echo "$captcha";
?>
然后是下一个：
<?php
$captcha2 = $_POST['captcha']; //This is the input field
$submit = $_POST['submit']; //This is Submit
if ($submit) {
if ($captcha2) {
echo "Everything is good."; //Echo'd if everything is good
} else {
echo "Please fill in all fields."; //Echo'd if $captcha isn't filled out
}
} else {
echo "Direct access not allowed. Please click submit."; //Echo'd if submit is not pressed, and they access this directly.
}
?>
如何从其他表单中获取$ captcha变量并将其放入captcha.php页面？我认为$ captcha有很多变量放在一个，所以
答案 0 :(得分：1)
使用会话：http://php.net/manual/en/features.sessions.php
创建会话时生成随机字符串并将其存储在$_SESSION中。使用该值绘制CAPTCHA并进行检查。