Question

这是生成验证码图像的文件：
的 captcha.php

<?php
    generateCaptcha();
    exit();

    function generateCaptcha() {

        $captcha = 'ABCDEFGHJKLMNPQRSTUVWXYZ123456789abcdefghijkmnpqrstuvwxyz';
        $captcha = substr(str_shuffle($captcha), 0, 6);
        $_SESSION['captcha'] = $captcha;    // This is NOT working!!

        $font_size = 40;
        $img_height = 60;
        $img_width = 170;

        $image = imagecreate($img_width, $img_height);
        imagecolorallocate($image, 255, 255, 255);

        $text_color = imagecolorallocate($image, 0, 0, 0);
        imagettftext($image, $font_size, 0, 0, 50, $text_color, 'font/monofont.ttf', $captcha);

        header('Content-type: image/png');
        imagepng($image);

        imagedestroy($image);
    }
?>

这是我的 index.php 文件：

<?php
    require_once "includes/functions.php";
    sec_session_start();
?>
<!DOCTYPE html>
<html>
<body>
<form action="process.php" method="most">
    <?php echo "<img src='captcha.php'>"; ?>
    <input type="text" name="captcha">
    <input type="submit" name="VerifyCaptcha" value="Verify Humanship">
</form>
</body>
</html>

这是我的 process.php 文件：

<?php
    if(isset($_SESSION['captcha'])) {
        if($_SESSION['captcha'] == $_POST['captcha'])
            echo "You're a human!";
        else echo "I doubt you!";
    } else header('Location: ../');
?>

captcha.php 文件中的第9行无效。不生成会话变量。任何修复？

Answer 1

在考虑使用session_start();数组做任何事情之前，您可能忘记致电$_SESSION。

这一行应该是执行的第一行（不完全是，但是你明白了），所以我建议在include require_once指令之前加上这行：

<?php
    session_start();
    require_once "includes/functions.php";
    sec_session_start();
?>
<!DOCTYPE html>
<html>
<body>
<form action="process.php" method="most">
    <?php echo "<img src='captcha.php'>"; ?>
    <input type="text" name="captcha">
    <input type="submit" name="VerifyCaptcha" value="Verify Humanship">
</form>
</body>
</html>

确保在captcha.php中执行相同的操作。

我不完全确定sec_session_start做了什么，尝试将该行放在require_once之前，看看是否能修复它。

Answer 2

终于能够解决问题了！更新了<?php sec_session_start(); header("Pragma: no-cache"); generateCaptcha(); exit(); function generateCaptcha() { $captcha = 'ABCDEFGHJKLMNPQRSTUVWXYZ123456789abcdefghijkmnpqrstuvwxyz'; $captcha = substr(str_shuffle($captcha), 0, 6); $_SESSION['captcha'] = $captcha; $font_size = 40; $img_height = 60; $img_width = 170; $image = imagecreate($img_width, $img_height); imagecolorallocate($image, 255, 255, 255); $text_color = imagecolorallocate($image, 0, 0, 0); imagettftext($image, $font_size, 0, 0, 50, $text_color, 'font/monofont.ttf', $captcha); header('Content-type: image/png'); imagepng($image); imagedestroy($image); } function sec_session_start() { $session_name = 'admin_panel'; session_name($session_name); $secure = false; $httponly = true; if(ini_set('session.use_only_cookies', 1) === FALSE) { header("Location: .../error.php?err=Could not initiate safe session"); exit(); } $cookieParams = session_get_cookie_params(); session_set_cookie_params($cookieParams["lifetime"], $cookieParams["path"], $cookieParams["domain"], $secure, $httponly); session_start(); session_regenerate_id(true); } ?>文件：

BaseView

CAPTCHA验证无效

2 个答案: